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BRUCELLOSIS

Classification   |    Detailed evidence-based information

Therapeutic Toxic Class

    A) Brucellosis is a multisystem bacterial zoonotic disease caused by organisms of the genus Brucella. Four Brucella species are infective for humans: B abortus, B melitensis, B suis, and B canis. Humans become infected by ingestion of animal food products, direct contact with infected animals, or inhalation of infectious aerosols. In particular, B. melitensis and B. suis are potential agents of biological terrorism.

Specific Substances

    1) Brucella
    2) Brucella spp
    3) B abortus
    4) B canis
    5) B melitensis
    6) B suis
    7) Brucellosis abortus
    8) Brucellosis canis
    9) Brucellosis melitensis
    10) Brucellosis suis

Available Forms Sources

    A) FORMS
    1) Brucella bacteria are gram-negative, aerobic coccobacilli that are nonmotile and lack spores or capsule (Trujillo, 1994; (Radolf, 1994).
    B) SOURCES
    1) Brucellosis commonly occurs following occupational exposure to livestock (eg, breeding, birthing, slaughtering). Persons in high-risk occupations include farmers, Bedouins, shepherds, ranchers; abattoir and meat packing plant workers; veterinarians; and laboratory workers (Malik, 1997) Trujillo, 1994; (Radolf, 1994) Ruben, 1991; (Gelfand et al, 1989) Lulu, 1988; (Taylor & Perdue, 1989) Staszkiewicz, 1991; (CDC, 1994) Chomel, 1994; Gruner, 1994; Robson, 1993; (Zervos & Bostic, 1997).
    2) Unpasteurized milk and dairy products (butter, ice cream, cheese, yogurt) are common sources of transmission, including the majority of US cases. Primary cause in persons less than 20 years (Malik, 1997; Schussler et al, 1997) Lulu, 1988; (Dajani et al, 1989) Mousa, 1988; Al-Eissa, 1990; (Sharda & Lubani, 1986) Mousa, 1987; (Mohd, 1989; Taylor & Perdue, 1989) Chomel, 1994; Yinnon, 1993).
    C) USES
    1) Because of its ease of transmission by aerosol, it has potential for use against military forces in combat and as tool of terrorists against civilians. Brucellae are highly infectious by aerosol and can survive for 6 weeks in dust and 10 weeks in soil or water. The organism could be delivered as a slurry in bomblets or, theoretically, as a dry aerosol (Franz, 1997; ((Hoover, 2000)).
    a) The US no longer weaponizes Brucellae, although other countries have or are suspected to have done so (Franz, 1997).

Life Support

    A) This overview assumes that basic life support measures have been instituted.

Clinical Effects

    0.2.1) SUMMARY OF EXPOSURE
    A) ACUTE stage (signs and symptoms present <2 mo after infection) characterized by acute febrile flu-like illness with chills, sweats, headache, myalgia, arthralgia, and weakness, usually without any localizing signs. Onset may be sudden or insidious; prolonged recovery, even with antibiotic therapy. Incubation period is 3 to 5 days to several weeks. Relapses are common. Symptoms and signs are nonspecific.
    B) SUBACUTE stage: Signs and symptoms present 2 to 12 mo; similar to acute stage.
    C) CHRONIC stage (signs and symptoms present >12 mo): Uncommon following adequate treatment of acute illness; neuropsychiatric symptoms predominate; characterized by fever, malaise, headache, anxiety, depression; treated persons with chronic illness usually have suppurative localization (especially of bone or joints).
    D) Symptoms and signs are similar in patients with presumed oral, aerosol, or percutaneous infection. The bacterium disseminates throughout the reticuloendothelial system, thus it may cause disease in almost any organ system. Favored targets include large joints and axial skeleton. Approximately one-third of patients are affected with arthritis.
    E) Fatalities are rare and usually occur in association with central nervous system disease or endocardial infection.
    0.2.20) REPRODUCTIVE
    A) Transplacental transmission may occur, with subsequent infection of the neonate. Direct cause-and-effect relationship of brucellosis to first- or second-trimester spontaneous abortion is unclear.

Laboratory Monitoring

    A) Serology is indicated for rapid diagnosis. The tube agglutination test is the current standard method for serologic diagnosis.
    B) Isolation of Brucella spp by culture is the gold standard for diagnosis, but may not become positive for a week or more.
    C) Monitor CBC in all suspected cases.
    D) Monitor fluid and serum electrolyte status.
    E) Monitor liver function tests.
    F) Bone scan may be indicated in patients with osteoarticular involvement.

Treatment Overview

    0.4.2) ORAL/PARENTERAL EXPOSURE
    A) Cases of brucellosis contracted by eating contaminated foods result in the same symptomology as airborne brucellosis cases. Refer to treatment recommendations in the INHALATION EXPOSURE section.
    B) Early use of antibiotic therapy is indicated in all cases. Steroids are indicated in severe cases. Supportive measures include antipyretics and analgesics for myalgia, arthralgia, and headache. No commercial vaccine exists for prophylaxis of brucellosis.
    0.4.3) INHALATION EXPOSURE
    A) The bacteria are highly infectious by aerosol. Early use of antibiotic therapy is indicated in all cases. Steroids are indicated in severe cases. Supportive measures include antipyretics and analgesics for myalgia, arthralgia, and headache. No commercial vaccine exists for prophylaxis of brucellosis.
    1) Combination antibiotic therapy indicated because of high relapse rate with single-drug therapy. Specific regimens controversial; no completely effective regimen for initial treatment or prevention of relapses.
    B) Uncomplicated brucellosis: ADULTS: Doxycycline: 100 mg PO BID for 6 wk plus gentamicin (preferred) 2 mg/kg load then 1.7mg/kg IV Q8H, or 5mg/kg IV every day, for 7 to 10 days. Either streptomycin or rifampin may be given in place of gentamicin. CHILDREN OVER 8 YEARS: Doxycycline: 1 to 2 mg/kg PO BID for 6 wk plus gentamicin (preferred): 2 mg/kg IV Q8H for 7 to 10 days. Either streptomycin or rifampin may be given in place of gentamicin. CHILDREN LESS THAN 8 YEARS: TMP/SMX : 5 mg/kg TMP and 50 mg/kg SMX PO Q12H for 6 wk plus gentamicin 2 mg/kg IV Q8H for 7 to 10 days.
    C) Neurobrucellosis: ADULTS: Gentamicin: 2 mg/kg loading dose, then 1.7 mg/kg IV Q8H, or 5 to 7 mg/kg IV everyday, for 2 to 4 wk plus doxycycline 100 mg PO BID for 8 to 12 wk plus rifampin 600 to 900 mg PO everyday for 8 to 12 wk. CHILDREN: Gentamicin: 2 mg/kg IV Q8H for 2 to 4 wk plus either doxycycline (over 8 yr): 2 mg/kg PO BID for minimum of 8 wk OR TMP/SMX (less than 8 years): 5 mg/kg TMP and 50 mg/kg SMX PO Q12H for minimum of 8 wk plus rifampin: 20 mg/kg (max 600 mg) PO every day for minimum of 8 wk.
    D) STEROIDS: methylprednisolone (Severe/complicated cases): 10 to 40 mg IV, repeated up to 6 times daily. For shock: 30 mg/kg IV infused over 30 minutes; may repeat every 4 to 6 hours, not beyond 48 to 72 hours.
    E) Airway management may be required in severe cases of dyspnea.
    F) Monitor fluid and electrolyte status and replace as necessary.
    G) Report all cases to local or state health departments.
    0.4.4) EYE EXPOSURE
    A) Oculoglandular brucellosis occurs when the portal of entry is the eye. Painful inflammation of the conjunctivae and edema of the eyelid develop. In cases of accidental eye splashes of fluids containing Brucellae organisms, immediately flush the eyes with water.
    B) Treatment should include recommendations listed in the INHALATION EXPOSURE section when appropriate.
    0.4.5) DERMAL EXPOSURE
    A) OVERVIEW
    1) Brucellosis may be contracted from exposure to mucous membranes, or dermally from an open wound in a laboratory setting or while handling infected animals. Exposed skin should be thoroughly washed.
    2) Treatment should include recommendations listed in the INHALATION EXPOSURE section when appropriate.

Range Of Toxicity

    A) An infective aerosol dose for humans is estimated to be 10 to 100 organisms. Fatalities are uncommon.

Hepatic

    3.9.2) CLINICAL EFFECTS
    A) LARGE LIVER
    1) WITH POISONING/EXPOSURE
    a) Moderate hepatomegaly may be noted in 10% to 40% of patients; liver may be tender (Malik, 1997; Mohd, 1989) Mousa, 1988; Al-Eissa, 1990; (Benjamin & Annobil, 1992). This may be more common in children; in 5 pediatric studies, incidences between 27% and 69% were noted (Galanakis, 1996; Gottesman, 1996).

Genitourinary

    3.10.2) CLINICAL EFFECTS
    A) DYSURIA
    1) WITH POISONING/EXPOSURE
    a) Patients may present with UTI symptoms, including dysuria (Mousa, 1988; Robson, 1993; Yinnon, 1993). In one large series, brucellosis was highly associated with prostatitis in men (Colmenero, 1996).
    B) PAIN
    1) WITH POISONING/EXPOSURE
    a) Patients may present with UTI symptoms, including suprapubic or loin pain (Mousa, 1988).
    b) Testicular edema and pain may be present in males with epididymo-orchitis (Lulu, 1988; (Khan et al, 1989) Patel, 1988; Reisman, 1990).
    C) URGENT DESIRE TO URINATE
    1) WITH POISONING/EXPOSURE
    a) Patients may present with UTI symptoms, including urinary frequency and urgency, especially during the subacute and chronic stages (Lulu, 1988; Mousa, 1988). In one large series, brucellosis was highly associated with prostatitis in men (Colmenero, 1996).
    D) IMPOTENCE
    1) WITH POISONING/EXPOSURE
    a) Impotence may occur in patients with chronic infection (Trujillo, 1994; (Radolf, 1994).
    E) ORCHITIS
    1) WITH POISONING/EXPOSURE
    a) Orchitis is usually unilateral; presents with acute scrotal pain and swelling, with little or no dysuria; does not cause sterility; also may involve epididymis and may be bilateral (Patel, 1988; (Khan et al, 1989) Reisman, 1990; Ibrahim, 1988; (Afsar et al, 1993). Systemic symptoms precede genitourinary complaints in about 3/4 of cases, but may present simultaneously (Colmenero, 1996).
    F) NEPHRITIS
    1) WITH POISONING/EXPOSURE
    a) Diffuse interstitial nephritis with azotemia, proteinuria, and hypertension may occur with renal involvement (Trujillo, 1994; (Radolf, 1994). A case of acute focal bacterial nephritis with normal renal function has also been described (Loberant, 1995).
    G) DISORDER OF PROSTATE
    1) WITH POISONING/EXPOSURE
    a) In one large series, prostatitis occurred in about 1% of male patients and presented with urinary symptoms (dysuria, frequency, urgency, sensation of incomplete voiding). Biopsy in 2 patients showed chronic inflammation with granuloma formation (Colmenero, 1996).

Summary Of Exposure

    A) ACUTE stage (signs and symptoms present <2 mo after infection) characterized by acute febrile flu-like illness with chills, sweats, headache, myalgia, arthralgia, and weakness, usually without any localizing signs. Onset may be sudden or insidious; prolonged recovery, even with antibiotic therapy. Incubation period is 3 to 5 days to several weeks. Relapses are common. Symptoms and signs are nonspecific.
    B) SUBACUTE stage: Signs and symptoms present 2 to 12 mo; similar to acute stage.
    C) CHRONIC stage (signs and symptoms present >12 mo): Uncommon following adequate treatment of acute illness; neuropsychiatric symptoms predominate; characterized by fever, malaise, headache, anxiety, depression; treated persons with chronic illness usually have suppurative localization (especially of bone or joints).
    D) Symptoms and signs are similar in patients with presumed oral, aerosol, or percutaneous infection. The bacterium disseminates throughout the reticuloendothelial system, thus it may cause disease in almost any organ system. Favored targets include large joints and axial skeleton. Approximately one-third of patients are affected with arthritis.
    E) Fatalities are rare and usually occur in association with central nervous system disease or endocardial infection.

Vital Signs

    3.3.3) TEMPERATURE
    A) WITH POISONING/EXPOSURE
    1) FEVER - Brucellosis is characterized by acute febrile illness, with flu-like manifestations; fever present at some time in most patients and is often accompanied by chills (Malik, 1997; Schussler et al, 1997; Taylor & Perdue, 1989) Lulu, 1988; (Mohd, 1989) Al-Eissa, 1990; Mousa, 1988; Chomel, 1994; Robson, 1993; Yinnon, 1993; Colmenero, 1996; Galanakis, 1996). Fever is also a common feature of chronic infection (Lulu, 1988).
    a) Most commonly, temperature is normal or slightly elevated in morning and rises in afternoon; maximum daily temperature ranges from 101 F to 104 F (Trujillo, 1994; (Radolf, 1994).
    b) Chills may be present in up to 70% to 80% of patients in the acute or subacute stages (Al-Eissa, 1990; Lulu, 1988; Mousa, 1988; (Taylor & Perdue, 1989) Yinnon, 1993). Chills may occur in about 50% of patients during the chronic stage of illness (Lulu, 1988).
    2) HYPOTHERMIA as a presenting sign of brucellosis in an elderly person has been reported (Vales, 1993), but this is not an expected occurrence in the majority of patients.

Heent

    3.4.3) EYES
    A) WITH POISONING/EXPOSURE
    1) Visual changes secondary to uveitis can be seen in acute or chronic cases and can be unilateral or bilateral. In severe cases, hypopyon may occur. Acute endophthalmitis has also been reported (Al-Kaff, 1995).
    2) In chronic disease, smoldering uveitis and nodular choroiditis with adjacent retinal edema and hemorrhages are described most commonly. Vitreous exudates, cystoid macular edema, and retinal detachment have been reported (Al-Kaff, 1995).
    3) Optic nerve involvement may occur in up to 10% of patients and may present with papillary congestion, retrobulbar neuritis, papilledema, or chiasmal arachnoiditis (Al-Kaff, 1995).
    3.4.5) NOSE
    A) WITH POISONING/EXPOSURE
    1) EPISTAXIS - Nasal bleeding, usually mild and not related to marked thrombocytopenia or DIC, may be present in about 2% of patients (Galanakis, 1996; Colmenero, 1996).

Dermatologic

    3.14.2) CLINICAL EFFECTS
    A) EXCESSIVE SWEATING
    1) WITH POISONING/EXPOSURE
    a) ACUTE disease - Night sweats is a common feature, present in up to 90% of patients (Al-Eissa, 1990; Lulu, 1988; Mousa, 1988; (Mohd, 1989) Shehabi, 1990); often profuse with characteristic moldy odor (Mousa, 1988).
    1) Diaphoresis may be less common in children; in two pediatric studies, sweating was present in <20% of patients and classic odor was rare (Galanakis, 1996; Gottesman, 1996).
    b) CHRONIC disease - Increased sweating was noted in about two thirds of patients (Lulu, 1988).
    B) ERUPTION
    1) WITH POISONING/EXPOSURE
    a) Reported dermatologic manifestations include (Nagore, 1999; Ariza, 1989):
    1) Disseminated, well-defined, violet-erythematous papulonodular eruption with smooth surface located on trunk, forearms, thighs, and legs; lesions range in size from few millimeters to >1 cm; may be few to >100 lesions; may show central ulceration; occasionally may be pruritic.
    2) Erythematous violaceous nodules over extensor surfaces of legs in erythema nodosum-like pattern.
    3) Extensive purpura.
    4) Diffuse maculopapular rash, mainly affecting lower extremities.
    b) Rash does not appear to worsen prognosis and resolves within a few days after starting appropriate treatment (Nagore, 1999).

Musculoskeletal

    3.15.2) CLINICAL EFFECTS
    A) MUSCLE PAIN
    1) WITH POISONING/EXPOSURE
    a) Muscle pain may be present in up to 75% of patients, most commonly during the subacute stage (Lulu, 1989; Mousa, 1987a, 1988; Khateeb, 1990; Robson, 1993; (Applebaum & Mathisen, 1997). It appears to be more common in children than adults (Zaks, 1995).
    B) BACKACHE
    1) WITH POISONING/EXPOSURE
    a) Back pain is the most frequent osteoarticular manifestation, present in 60% to 70% of patients (Malik, 1997) Cordero-Sanchez, 1990; Khateeb, 1990; (Taylor & Perdue, 1989) Mousa, 1988; Lulu, 1988; Robson, 1993; (Applebaum & Mathisen, 1997). It may be a nonspecific symptom in context of osteoarticular aches associated with the disease (Cordero-Sanchez, 1990) or may be related to sacroiliac involvement or involvement of spine and adjacent areas (Ozgul, 1998; Cordero-Sanchez, 1990; Rajapakse, 1987; Al-Rawi, 1989; Mohan, 1990; (Applebaum & Mathisen, 1997).
    b) In acute brucellosis, pain is typically related to back muscles; in chronic cases, low back pain is a prominent feature (Bahar, 1988).
    C) JOINT PAIN
    1) WITH POISONING/EXPOSURE
    a) Joint pain without other signs of inflammation is a common complaint, noted in 1/3 of to 3/4 of cases; more common in children (peak in ages 2 to 6 yr) where incidences up to 83% have been noted (Malik, 1997) Zaks, 1995; Colmenero, 1996; Gottesman, 1996; Khateeb, 1990; (Sharda & Lubani, 1986) Mousa, 1987a, 1988; Al-Eissa, 1990; (Alvarez De Buergo et al, 1990; Mohd, 1989) Shehabi, 1990; Lulu, 1988; (Lubani et al, 1986a) Benjamin, 1992a; Yinnon, 1993).
    b) Usually the joint paint is monoarticular and unilateral; sacroiliac joint, knee, and hip are affected most frequently; spine, ankle, sternoclavicular joint, shoulder, wrist, and elbow are involved less commonly (Lulu, 1988; Mousa, 1987a, 1988; Al-Essia, 1990; Khateeb, 1990; (Sharda & Lubani, 1986) Mousa, 1988; (Alvarez De Buergo et al, 1990; Lubani et al, 1986a) Benjamin, 1992a, 1994; Knapp, 1994; Berrocal, 1993).
    c) Peripheral large joint involvement is more common in children and young adults (Alvarez De Buergo et al, 1990; Lubani et al, 1986a) Al-Essia, 1990; (Sharda & Lubani, 1986) Mousa, 1987a, 1988; Benjamin, 1992a, 1994; Knapp, 1994; Galanakis, 1996; Gottesman, 1996).
    d) Involvement of small and centrally placed joints and spondylitis is often more common in adults (Mousa, 1987, 1988; Ariza, 1993; Colmenero, 1996).
    e) Joint effusion may be present in patients with Brucella arthritis, particularly during the acute stage; primarily elicited in knee, ankle, and wrist joints (Khateeb, 1990; Mousa, 1987a; Al-Rawi, 1989; Benjamin, 1992a).
    D) ARTHRITIS
    1) WITH POISONING/EXPOSURE
    a) Arthritis is a complication of brucellosis and may be septic or reactive (Alvarex de Buergo, 1990; (Lubani et al, 1986a) Rajapakse, 1990; Bahar, 1988). It may occur during any stage (including relapses) but most common during acute and subacute stages (Khateeb, 1990; (Sharda & Lubani, 1986) Lulu, 1988; (Al-Rawi et al, 1987) 1989; Shaheen, 1988; (Alvarez De Buergo et al, 1990) Mousa, 1987a; Benjamin, 1992a; (Benjamin & Khan, 1994).
    b) Incidence is highly variable (10% to 70%), depending on pathogenicity of species and diagnostic criteria (Madkour, 1988; Benjamin, 1992a). Brucellosis should be considered in patients with joint pain and fever who come from or have visited an endemic area or have other risk factors (Knapp, 1994; (Benjamin & Khan, 1994).
    c) Onset may be acute or insidious; most typically occurs simultaneously with or shortly after onset of fever; usually associated with severe limitation of movement and joint pain and tenderness (Alvarez De Buergo et al, 1990) Mousa, 1987a; (Lubani et al, 1986a) Shaheen, 1988; (Al-Rawi et al, 1987) 1989; Benjamin, 1992a, 1994; Knapp, 1994; (Benjamin & Khan, 1994) Ariza, 1993).
    d) Arthritis is typically monarticular and unilateral; sacroiliac joint most commonly involved in adults, followed by knee, hip, and ankle; spine, sternoclavicular joint, shoulder, wrist, and elbow involved less commonly (Lulu, 1988; Mousa, 1987a, 1988; Al-Essia, 1990; Khateeb, 1990; (Sharda & Lubani, 1986; Alvarez De Buergo et al, 1990; Lubani et al, 1986a) Al-Rawi, 1989; Shaheen, 1988; (Al-Rawi et al, 1987) 1989; Gotuzzo, 1987; Colemnero, 1991, 1996; Benjamin, 1992a, 1994; (Sankaran-Kutty et al, 1991) Berrocal, 1993; Al-Shahed, 1994; Knapp, 1994). Large peripheral joint (knee, hip) involvement is more common in children and young adults (Al-Essia, 1990; (Benjamin & Annobil, 1992) 1992a, 1994; Mousa, 1987a, 1988; (Lubani et al, 1986a) Knapp, 1994; Galanakis, 1996).
    e) In most cases, the ESR is only moderately elevated and WBC count is normal with relative lymphocytosis. This, along with a more indolent presentation and moderate local signs of inflammation, helps differentiate from an acute septic arthritis (Lubani et al, 1986a).
    f) CASE SERIES - In a prospective study of 263 patients with brucellosis, hip joint involvement was found in 33 (20.4%) of 162 patients with osteoarticular form of the disease. Patients with hip arthritis were younger, with a mean age of 23.7 years (+/- 19.9 years {range 4 to 69}), compared with a mean age of 39.7 years (+/- 18.2 years) in the patients without hip involvement. In 21 cases, the disease was acquired through direct contact with infected animals, 10 developed disease after ingestion of an incriminated product, and in 2 the origin was unknown. In 5 patients, hip arthritis was the only clinical feature of brucellosis exposure.
    1) Time between onset of symptoms and diagnosis was 43.8 days (+/- 44.5 {range 5 to 180 days}). The most dominant laboratory findings were elevation of circulating immune complexes (>0.05 g/L) and C-reactive protein (>8 mg/L). Unilateral reports of hip pain were common.
    2) Clinical manifestations in these 33 patients included fever (22); sweating (22); arthralgia (27); Malaise (16); headache (18); weight loss (4); hepatomegaly (15); splenomegaly (9); and lymphadenopathy (8).
    3) In most patients treatment consisted of doxycycline/rifampin/co-trimoxasole or rifampin/co-trimoxasole combination. Twenty-two patients were cured with one course of antibiotic therapy (Bosilkovski et al, 2004).
    E) SPONDYLITIS
    1) WITH POISONING/EXPOSURE
    a) The incidence of brucellosis spondylitis is highly variable (2% to 60%); common manifestation of chronic brucellosis (Gonzalez-Gay, 1999; Bahar, 1988; (Sankaran-Kutty et al, 1991) Ariza, 1993); often associated with neurobrucellosis (Mousa, 1989; Mohan, 1990; Colmenero, 1991, 1992) or sacroiliitis (Ariza, 1993). It primarily involves the intervertebral area of the lumbar or dorsal spine; cervical spine and sacroiliac region involved less frequently (Mousa, 1987a; Bahar, 1988; Al-Rawi, 1989; Rajapakse, 1990; Mohan, 1990; Colmenero, 1991, 1992; Cordero, 1991; Al-Shahed, 1994).

Immunologic

    3.19.2) CLINICAL EFFECTS
    A) LYMPHADENOPATHY
    1) WITH POISONING/EXPOSURE
    a) Small, non-tender cervical, inguinal or axillary lymph nodes are present in 10% to 20% of patients (Mohd, 1989) Al-Eissa, 1990; Mousa, 1988). In one study, lymphadenopathy was present in 80% of children; other pediatric studies, however, have found much lower incidences and one found the incidence was not different from normal children (Yinnon, 19993; Galanakis, 1996; Gottesman, 1996).
    B) MULTIPLE ORGAN DYSFUNCTION SYNDROME
    1) WITH POISONING/EXPOSURE
    a) Complications involving multiple organ systems occur in up to 30% of all patients, most commonly those infected with B melitensis or B suis; rate increases if treatment is delayed, and about 1/2 of patients with a diagnostic delay >3 months experience complications (Trujillo, 1994; (Radolf, 1994) Lulu, 1988; Colmenero, 1996). May be initial presentation (Gelfand et al, 1989) Jayakumar, 1988).
    1) CARDIOVASCULAR: Endocarditis (Chan & Hardiman, 1993); myocarditis; pericarditis; arterial and intracranial aneurysms; arteriovenous fistulas (Lubani et al, 1986; Yee & Roach, 1996).
    2) RESPIRATORY: Pneumonia; bronchitis; pleurisy; pleural effusion; granulomatous lung abscess; mediastinitis; empyema (Garcia-Rodriguez, 1989; Lubani, 1989b; (Mili et al, 1993; Al-Eissa, 1993a).
    3) GASTROINTESTINAL: Hepatitis (Aygen, 1998; Talley, 1988); hepatic and splenic granulomas or abscesses (Satti, 1990; Vargas, 1991); portal cirrhosis; cholecystitis (Odeh & Oliven, 1995) Shaheen, 1989); ileitis; pancreatitis (Al-Awadhi et al, 1989); colitis (Stermer, 1991); esophageal lesions (Laso et al, 1994).
    4) NEUROLOGIC: Meningitis; meningoencephalitis; peripheral neuropathy/radiculopathy; meningovascular complications (stroke, intracerebral hemorrhage); parenchymatous dysfunction; brain abscess; subdural empyema; cerebellar ataxia (Pina, 1999; (Omar et al, 1997; Shakir, 1986) 1987; Guvenc, 1989; Pascual, 1988; Al-Deeb, 1989; Lubani, 1989a; Bahemuka, 1988; (McLean et al, 1992) Kaleliogh, 1990; (Al-Eissa, 1993a) 1995; (Pera et al, 1996) Shoshan, 1996).
    5) MUSCULOSKELETAL: Most common; represents about 2/3 of all complications. Arthritis (septic or reactive); osteomyelitis; tendinitis; bursitis; spondylitis; sacroiliitis (Gonzales-Gay, 1999; (Malik, 1997) Tasdan, 1998; Al-Rawi, 1989; Shaheen, 1988; Mousa, 1987a; Madkour, 1988; Colmenero, 1991; Benjamin, 1992a; Al-Shahed, 1994; (Al-Eissa, 1993a) Colmenero, 1996; (Applebaum & Mathisen, 1997).
    6) GENITOURINARY: Diffuse interstitial nephritis; renal abscesses and calcifications; ulceration of renal pelvis, ureter, bladder; ovarian abscess; epididymo-orchitis (Afsar, 1992); acute focal bacterial nephritis (Loberant, 1995); prostatitis (Aygen, 1998); spontaneous abortion (possibly) (Ibrahim, 1988).
    7) HEMATOLOGIC: Anemia; neutropenia; thrombocytopenia; acute thrombocytopenic purpura; DIC; pancytopenia (Shalev et al, 1994; Al-Eissa & Al-Nasser, 1993; Benjamin, 1995).
    8) DERMATOLOGIC: Disseminated papulonodular or diffuse maculopapular rash; erythema nodosum-like eruption; purpura (Ariza, 1989); subcutaneous abscesses (Gasser, 1991); fasciitis-panniculitis syndrome (Zuckerman, 1994); leukocytoclastic vasculitis (Nagore, 1999).
    9) OCULAR: Iritis (Gasser, 1991; Akduman, 1993); choroiditis; keratitis (Tabbara & Al-Kassimi, 1990); endophthalmitis (al Faran, 1990); uveitis with hypopyon; retinal detachment; retrobulbar neuritis (Al-Kaff, 1995).
    10) PSYCHIATRIC: Dementia; depression; manic or paranoid behavior; personality changes; psychotic reactions.
    11) ENDOCRINE/METABOLIC: SIADH (Aysha & Shayib, 1988); thyroiditis (von Graevenitz & Colla, 1990; Mousa et al, 1989a).
    C) ABSCESS
    1) WITH POISONING/EXPOSURE
    a) Patients with chronic brucellosis may develop abscesses in the liver, spleen, genitalia, spine, long bones, soft tissue, or brain (Pina, 1999; Trujillo, 1994; (Radolf, 1994) Vargas, 1991; (Al-Eissa, 1993a). In B suis infection, the spleen and liver may contain multiple abscesses that calcify and appear as round nodules on roentgenograms (Trujillo, 1994; (Radolf, 1994).
    D) INFECTIOUS DISEASE
    1) WITH POISONING/EXPOSURE
    a) RECURRENT BRUCELLOSIS may recur within 1 to 3 months in about 5% of cases; due to relapse or reinfection; results in milder febrile illness. Uncommon in patients who receive appropriate therapy; usually represents focal suppurative complications. May occur in persons with continuing exposure, eg, veterinarians and abattoir workers (Trujillo, 1994; (Radolf, 1994).
    b) Predictors of relapse include temperature of 38.3 C or higher, positive blood cultures at baseline, and duration of symptoms before treatment of more than 10 days (Solera, 1998). Relapses occur in up to 10% of treated patients, usually within 3 to 10 months after initial episode. Symptoms may be milder or more severe than in acute stage; CNS involvement possible (Chia et al, 1990). Relapses are more often related to failure to complete lengthy therapy or focal suppurative complications than to antibiotic resistance (Young, 1995). Extending duration of drug treatment to at least 6 weeks is associated with a reduced relapse rate (Malik, 1997).

Reproductive

    3.20.1) SUMMARY
    A) Transplacental transmission may occur, with subsequent infection of the neonate. Direct cause-and-effect relationship of brucellosis to first- or second-trimester spontaneous abortion is unclear.
    3.20.3) EFFECTS IN PREGNANCY
    A) PLACENTAL BARRIER
    1) Transplacental transmission may occur, with subsequent infection of the neonate (Malone, 1997; (Al-Eissa & Al-Mofada, 1992). One case report documents poor perinatal outcome associated with transplacental passage of the infection, resulting in chorioamnionitis and preterm delivery despite aggressive treatment (Malone, 1997).
    B) ABORTION
    1) Direct cause-and-effect relationship of brucellosis to first- or second-trimester spontaneous abortion is unclear. Reported incidence ranges from 12% to 31% (Makhseed, 1998; Lulu, 1988; Swoud, 1991; Sarram, 1974; Crisuolo, 1954). Difference in abortive effect of brucellosis in animals and humans may be due to absence of erythritol (a growth stimulant for brucellosis) in human placenta and anti-brucellosis activity of amniotic fluid (Seoud, 1991).

Cardiovascular

    3.5.2) CLINICAL EFFECTS
    A) ENDOCARDITIS
    1) WITH POISONING/EXPOSURE
    a) Cardiac complications occurred in <2% of a large series; endocarditis is the most common complication and often fatal once established. It accounts for about 80% of deaths due to brucellosis. Most cases are due to B abortus or B melitensis, although cases secondary to B suis have also been reported (Al-Harthi, 1989; Lubani et al, 1986) Fernandez-Guerrero, 1987; Jeroudi, 1987; Jacobs, 1990; Colmenero, 1996; ((Hoover, 2000)). In over half of cases, a previously healthy valve is involved. The aortic valve is affected in over 75% of cases; mitral valve involvement is less common and more likely to occur with previous valvular damage (Al-Harthi, 1989) Jeroudi, 1987; Jacobs, 1990; (Delvecchio et al, 1991; Chan & Hardiman, 1993) Colmenero, 1996).
    b) Failure to diagnose Brucella endocarditis usually is due to cultured blood being discarded after 8 days (cultures do not become positive for at least 8 days and even for as long as 6 weeks) (Al-Harthi, 1989). Echocardiography usually helpful in detecting valvular vegetations (Jeroudi, 1987; (Lubani et al, 1986)
    c) Prolonged clinical and subclinical course is common. Virtually all patients require valve replacement, prolonged antibiotic therapy, or both (Chia et al, 1990; Al-Harthi, 1989) Jeroudi, 1987; Al-Kasab, 1988; Fernandez-Guerrero, 1987; (Delvecchio et al, 1991) Jacobs, 1990; (Chan & Hardiman, 1993) Colmenero, 1996; Cohen, 1997).
    B) CARDIOVASCULAR FINDING
    1) WITH POISONING/EXPOSURE
    a) Cardiac manifestations of brucellosis should be suspected in patients presenting with a heart murmur and history of ingestion of unpasteurized milk or dairy products (Lubani et al, 1986).

Respiratory

    3.6.2) CLINICAL EFFECTS
    A) DYSPNEA
    1) WITH POISONING/EXPOSURE
    a) Respiratory symptoms, including dyspnea, may be present in up to 25% of patients (Mousa, 1988). Although respiratory symptoms (cough, pleuritic chest pain, dyspnea) occur, they do not usually denote pneumonia (Franz et al, 1997).
    B) COUGH
    1) WITH POISONING/EXPOSURE
    a) Respiratory symptoms, including dry cough, may be present in up to 30% of patients (Mousa, 1988; Lulu, 1988; Lubani, 1989b; Garcia-Rodriguez, 1989; (Benjamin & Annobil, 1992) Robson, 1994; Yinnon, 1993).

Neurologic

    3.7.2) CLINICAL EFFECTS
    A) HEADACHE
    1) WITH POISONING/EXPOSURE
    a) Headache is a complaint in 20% to 75% of patients, especially during the chronic stage (Malik, 1997) Al-Eissa, 1990; (Mohd, 1989; Taylor & Perdue, 1989) Mousa, 1987a, 1988; Khateeb, 1990; Lulu, 1988; Yinnon, 1993).
    B) NEURITIS
    1) WITH POISONING/EXPOSURE
    a) Neurobrucellosis can imitate various neurologic syndromes and conditions. In endemic areas, this should be suspected in patients with obscure or unexplained neurologic deficits, even without a definite history of exposure (Bahemuka, 1988; Al-Eissa, 1995).
    C) FATIGUE
    1) WITH POISONING/EXPOSURE
    a) Fatigue, a typical symptom of acute febrile illness, occurs in up to 3/4 of patients; fatigue and weakness may be prolonged (Lulu, 1988; Colmenero, 1996).
    D) MALAISE
    1) WITH POISONING/EXPOSURE
    a) Malaise is a typical symptom of acute febrile illness; it is a less common complaint among children (Al-Eissa, 1990; Mousa, 1987a; Benjamin, 1992a; Chomel, 1994; Robson, 1993; Yinnon, 1993; Galanakis, 1996; Gottesman, 1996).
    E) NEUROPATHY
    1) WITH POISONING/EXPOSURE
    a) NEUROBRUCELLOSIS - Involvement of central or peripheral nervous system occurs in 2% to 6% of adults (McLean et al, 1992) Bahemuka, 1988; Bashirm 1985; (Shakir, 1986) et al, 1989). This is rare in children, accounting for less than 1% of cases (Habeeb, 1998; (Omar et al, 1997). Although adult and pediatric neurobrucellosis have similar clinical spectrums, cases in adults can be either acute or chronic, whereas in children, it is usually an acute presentation. Peripheral nervous system involvement in isolation or in association with the CNS may occur in 1/3 of adults but has not been reported in children. Pediatric neurobrucellosis usually involves the CNS, and the clinical presentation is mainly as acute meningitis or meningoencephalitis (Habeeb, 1998).
    1) Neurobrucellosis may include meningitis, meningoencephalitis; peripheral neuropathy/radiculopathy; meningovascular complications (stroke, intracerebral hemorrhage); parenchymatous dysfunction; brain abscess; subdural empyema; cerebral venous thrombosis, meningomyelitis; cerebellar ataxia (Zaidan & Al Tahan, 1999) Habeeb, 1998; Akdeniz, 1998; (Omar et al, 1997; Shakir, 1986) 1987; Guvenc, 1989; Pascual, 1988; Al-Deeb, 1989; Lubani, 1989a; Bahemuka, 1988; (McLean et al, 1992) Kaleliogh, 1990; Santini, 1994; (Pera et al, 1996) Al-Eissa, 1995; Shoshan, 1996).
    F) MENINGITIS
    1) WITH POISONING/EXPOSURE
    a) Bacterial meningitis is an uncommon complication; it may present as an initial manifestation or at any time during the course of disease; it may follow a subclinical course or manifest as acute or chronic infection (Bouza, 1987; Mousa, 1986; (McLean et al, 1992; Al Deeb et al, 1989).
    b) It mimics other neurologic and non-neurologic conditions; nuchal rigidity is present in only one third of patients (Bouza, 1987; Mousa, 1986). It may be associated with papilledema, optic neuropathy, or radiculopathy (McLean et al, 1992).
    c) Isolation of Brucella from CSF is uncommon; serologic tests on CSF are preferred (Bouza, 1987; Mousa, 1986; Lubani, 1989a; Al-Eissa, 1995).
    d) This has a better prognosis than other forms of chronic meningitis. It has a low mortality but high incidence of sequelae; may lead to disorders of vision and hearing, aphasia, ataxia, intermittent coma, hemiplegia (Bouza, 1987; (McLean et al, 1992) Al-Eissa, 1995).
    G) CEREBROVASCULAR DISEASE
    1) WITH POISONING/EXPOSURE
    a) Cerebrovascular accident may occur in patients with neurobrucellosis. Cerebral infarction may result from blood vessel thrombosis and spasm secondary to infectious vasculitis; intracerebral or subarachnoid hemorrhage may occur presumably secondary to ruptured mycotic aneurysm (McLean et al, 1992) Colmenero, 1996).
    H) SECONDARY PERIPHERAL NEUROPATHY
    1) WITH POISONING/EXPOSURE
    a) POLYRADICULOPATHY: Resembles Guillain-Barre syndrome; legs are more involved than arms. Characterized by slowly progressive flaccid paraparesis associated with backache, areflexia, sensory ataxia. Motor conduction velocities usually are normal but may show motor sensory polyneuropathy. EMG shows signs of denervation (McLean et al, 1992; Al Deeb et al, 1989) Bashir, 1985; (Shakir, 1986) 1987; Oliveri, 1996).
    b) MONONEURITIS: May affect cranial nerves (Al Deeb et al, 1989). Sensorineural hearing loss secondary to involvement of the 8th cranial nerve has been reported (Shakir, 1986) Lulu, 1988; Thomas, 1993).

Gastrointestinal

    3.8.2) CLINICAL EFFECTS
    A) LOSS OF APPETITE
    1) WITH POISONING/EXPOSURE
    a) Anorexia is a common presenting symptom of acute stage, noted in up to 75% of cases (Shehabi, 1990; Lulu, 1988; (Taylor & Perdue, 1989) Mousa, 1987a; Mouaket, 1989; (Benjamin & Annobil, 1992).
    B) VOMITING
    1) WITH POISONING/EXPOSURE
    a) Vomiting is a presenting symptom in 10% to 20% of cases (Revak, 1989; Al-Eissa, 1990; Lulu, 1988).
    C) WEIGHT LOSS FINDING
    1) WITH POISONING/EXPOSURE
    a) Weight loss may be a presenting symptom, particularly during subacute stage; incidence depends on duration of illness prior to diagnosis (Lulu, 1988; Revak, 1989; (Taylor & Perdue, 1989; Sharda & Lubani, 1986) Al-Eissa, 1990).
    b) Weight loss may be rapid and substantial (Robson, 1993).
    D) ABDOMINAL PAIN
    1) WITH POISONING/EXPOSURE
    a) Abdominal pain is present in up to 1/3 of patients (Lulu, 1988; (Alvarez De Buergo et al, 1990) Yinnon, 1993; Gottesman, 1996).
    E) SPLENOMEGALY
    1) WITH POISONING/EXPOSURE
    a) One of the few physical signs is splenomegaly. It is present in up to 80% of patients, depending on duration of illness prior to diagnosis (Malik, 1997) Al-Eissa, 1990; Lulu, 1988; Mousa, 1988; Shehabi, 1990; (Mohd, 1989; Benjamin & Annobil, 1992). It may be accompanied by left upper quadrant tenderness (Trujillo, 1994; (Radolf, 1994) Yinnon, 1993).
    F) COLITIS
    1) WITH POISONING/EXPOSURE
    a) Severe colitis presenting with abdominal pain and massive rectal bleeding has been reported in patients with brucellosis (Stermer, 1992). Colitis also may be associated with anemia in the absence of overt findings (Jorens, 1991).

Monitoring Parameters Levels

    4.1.1) SUMMARY
    A) Serology is indicated for rapid diagnosis. The tube agglutination test is the current standard method for serologic diagnosis.
    B) Isolation of Brucella spp by culture is the gold standard for diagnosis, but may not become positive for a week or more.
    C) Monitor CBC in all suspected cases.
    D) Monitor fluid and serum electrolyte status.
    E) Monitor liver function tests.
    F) Bone scan may be indicated in patients with osteoarticular involvement.
    4.1.2) SERUM/BLOOD
    A) BLOOD/SERUM CHEMISTRY
    1) Monitor CBC in all suspected cases. WBC may be normal, increased, or decreased (Sharda & Lubani, 1986) Lulu, 1988; Al-Eissa, 1990, 1993; (Benjamin & Annobil, 1992) Yinnon, 1993); lymphocyte count is often elevated (Galanakis, 1996; Lulu, 1988; Yinnon, 1993; (Al-Eissa & Al-Nasser, 1993); anemia is common (degree of anemia appears to correlate best with severity and duration of illness before diagnosis (uncommon during chronic stage)) (Lulu, 1988; Al-Eissa, 1990, 1993; (Benjamin & Annobil, 1992). ESR is usually elevated.
    a) Thrombocytopenia is an uncommon hematologic finding (6% to 14% of patients). When present, it is associated with other hematologic abnormalities, including pancytopenia (Al-Eissa, 1993a; Shalev et al, 1994).
    2) Monitor fluid and serum electrolyte status. Significant asymptomatic hyponatremia (Na <130 mmol/L) with normal renal function, despite prolonged fever and profuse perspiration, due to SIADH has been reported (Aysha & Shayib, 1988). A retrospective case-control study found high serum calcium levels in brucellosis patients (Malik, 1998a).
    3) Monitor liver function tests. Mildly to moderately elevated LDH, alkaline phosphatase, GGT, and aminotransferase levels may be noted, particularly during acute stage; may reflect severity of hepatic involvement; correlates clinically with hepatomegaly (Al-Eissa, 1990; Lulu, 1988; Robson, 1993; Yinnon, 1993; Colmenero, 1996).
    4.1.4) OTHER
    A) OTHER
    1) CULTURES
    a) Isolation of Brucella spp by culture is the gold standard for diagnosis; may not become positive for week or more (up to 6 weeks in some cases) (Chia et al, 1990) Trujillo, 1994; (Radolf, 1994); most helpful in acute B melitensis infection.
    1) CASE REPORT - A patient with suspected brucellosis had a 16-fold rise in titer (from 1:20 to 1:320) from paired serum specimens obtained on day 4 and day 22 for brucella antibodies by slide agglutination testing. Blood cultures were negative (CDC, 2000).
    b) Brucellae grow best on trypticase, soy-based, or other enriched media. Typical doubling time is 2 hours ((Hoover, 2000)). Culture of blood, bone marrow, or other infected body fluids most reliably confirms the diagnosis. Because it is extremely infectious and there is a risk of aerosolization during initial processing of specimens, the organism should be subcultured only in a biohazard hood. Biosafety level 3 containment should be used in the laboratory when handling cultures (Staszkiewicz, 1991; Gruner, 1994; ((Hoover, 2000); CDC, 1999).

Radiographic Studies

    A) RADIOGRAPHIC-OTHER
    1) BONE SCAN: More helpful than plain films in patients with osteoarticular involvement. Technetium or Gallium-67 bone scans are reported to be 90% sensitive for detecting sacroiliitis and can detect other sites of bone and joint involvement (CDC, 1999).
    2) Radiographic findings are similar to those of tuberculosis patients, and include disk space narrowing and epiphysitis, especially of the anterosuperior quadrant of the vertebrae, and presence of bridging syndesmophytes as repair occurs ((Hoover, 2000)).
    B) CHEST RADIOGRAPH
    1) Radiographic findings do not always correlate with pulmonary symptoms. Chest x-ray may be normal, or show lung abscesses, single or miliary nodules, bronchopneumonia, enlarged hilar lymph nodes, and pleural effusions (CDC, 1999).

Methods

    A) BIOASSAY
    1) Serology is indicated for rapid diagnosis. Because cultures may not become positive for a week or more, serologic tests are more valuable in making the diagnosis quickly and initiating specific therapy; most helpful in diagnosing subacute and chronic brucellosis, particularly B abortus and B suis infection; includes agglutination tests, ELISA (not yet well standardized), and fluorescent antibody titer. The tube agglutination test (detects antibodies to lipopolysaccharide) is the current standard method for serologic diagnosis ((Hoover, 2000)). The agglutination test is not useful for diagnosis of B canis, a naturally O-polysaccharide deficient strain.
    2) Polymerase chain reaction (PCR) - Rapid, specific test for all species of Brucella; no cross reactions with other gram-negative organisms; not generally available (Queipo Ortuno, 1997; Baily, 1992; Mercier, 1996; (Matar et al, 1996). In one study, sensitivity of PCR assay was 100%, with 98% specificity (Queipo Ortuno, 1997).

Life Support

    A) Support respiratory and cardiovascular function.

Patient Disposition

    6.3.3) DISPOSITION/INHALATION EXPOSURE
    6.3.3.1) ADMISSION CRITERIA/INHALATION
    A) Admit patients with severe or complicated brucellosis (e.g., neurobrucellosis, endocarditis, sepsis, spondylitis).
    6.3.3.2) HOME CRITERIA/INHALATION
    A) Discharge patients to home care with mild to moderate uncomplicated brucellosis in whom diagnosis and treatment can be made on clinical/historical grounds.
    6.3.3.3) CONSULT CRITERIA/INHALATION
    A) Consultation with an infectious disease specialist may be required for patients with severe or complicated brucellosis.
    B) Brucellosis is a notifiable disease; report cases to state or local health department (CDC, 1995).

Monitoring

    A) Serology is indicated for rapid diagnosis. The tube agglutination test is the current standard method for serologic diagnosis.
    B) Isolation of Brucella spp by culture is the gold standard for diagnosis, but may not become positive for a week or more.
    C) Monitor CBC in all suspected cases.
    D) Monitor fluid and serum electrolyte status.
    E) Monitor liver function tests.
    F) Bone scan may be indicated in patients with osteoarticular involvement.

Oral Exposure

    6.5.2) PREVENTION OF ABSORPTION
    A) ACTIVATED CHARCOAL
    1) There is no experience in the use of activated charcoal after ingestion of Brucellae contaminated food. Activated charcoal might be of use after recent ingestion.
    2) CHARCOAL ADMINISTRATION
    a) Consider administration of activated charcoal after a potentially toxic ingestion (Chyka et al, 2005). Administer charcoal as an aqueous slurry; most effective when administered within one hour of ingestion.
    3) CHARCOAL DOSE
    a) Use a minimum of 240 milliliters of water per 30 grams charcoal (FDA, 1985). Optimum dose not established; usual dose is 25 to 100 grams in adults and adolescents; 25 to 50 grams in children aged 1 to 12 years (or 0.5 to 1 gram/kilogram body weight) ; and 0.5 to 1 gram/kilogram in infants up to 1 year old (Chyka et al, 2005).
    1) Routine use of a cathartic with activated charcoal is NOT recommended as there is no evidence that cathartics reduce drug absorption and cathartics are known to cause adverse effects such as nausea, vomiting, abdominal cramps, electrolyte imbalances and occasionally hypotension (None Listed, 2004).
    b) ADVERSE EFFECTS/CONTRAINDICATIONS
    1) Complications: emesis, aspiration (Chyka et al, 2005). Aspiration may be complicated by acute respiratory failure, ARDS, bronchiolitis obliterans or chronic lung disease (Golej et al, 2001; Graff et al, 2002; Pollack et al, 1981; Harris & Filandrinos, 1993; Elliot et al, 1989; Rau et al, 1988; Golej et al, 2001; Graff et al, 2002). Refer to the ACTIVATED CHARCOAL/TREATMENT management for further information.
    2) Contraindications: unprotected airway (increases risk/severity of aspiration) , nonfunctioning gastrointestinal tract, uncontrolled vomiting, and ingestion of most hydrocarbons (Chyka et al, 2005).
    6.5.3) TREATMENT
    A) GENERAL TREATMENT
    1) Treatment should include recommendations listed in the INHALATION EXPOSURE section when appropriate.

Inhalation Exposure

    6.7.2) TREATMENT
    A) GENERAL TREATMENT
    1) ANTIBIOTICS OF CHOICE: High possibility of relapse makes combination antibiotic therapy necessary; no completely effective regimen for initial treatment or prevention of relapses. A study utilizing different drug regimens found no differences among the various combinations regarding early clinical response (Malik, 1998). Tetracyclines, sulfonamides, aminoglycosides, and rifampin are drugs of choice. Many other antibiotics (including 3rd- generation cephalosporins, fluoroquinolones) have been used with good clinical response but require further study.
    a) Usual recommendation for acute (uncomplicated) brucellosis is 6 weeks of oral antibiotic, plus parenteral therapy given for first 7 to 14 days, depending on the drug (Gilbert et al, 1999; Malik, 1997) Cisneros, 1990; Acocella, 1989; (Colmenero Castillo et al, 1989) Al-Eissa, 1990).
    b) Complicated cases (neurobrucellosis, endocarditis) require a minimum of 6 to 8 weeks, longer for chronic or protracted cases; may require up to 9 months of therapy (Habeeb, 1998; Akdeniz, 1998; Colmenero, 1996; Al-Eissa, 1995; (Hall, 1990).
    B) ANTIBIOTIC
    1) DOXYCYCLINE
    a) INDICATIONS - Tetracyclines are most effective class of antibiotics for the treatment of brucellosis; doxycycline has largely replaced tetracycline HCl because of its longer half-life, better tissue and CNS penetration, and fewer adverse effects. Used in all combination therapies for uncomplicated and complicated cases (including neurobrucellosis) in adults and in children over 8 years (Gilbert et al, 1999; Malik, 1997) Habeeb, 1998; Akdeniz, 1998; Colmenero, 1996; Al- Eissa, 1995; (Hall, 1990).
    b) DOXYCYCLINE RECOMMENDATION (Acute brucellosis) (Gilbert et al, 1999):
    1) ADULTS: 100 milligrams orally twice daily for six weeks, PLUS ONE OF FOLLOWING: gentamicin, streptomycin, rifampin.
    2) CHILDREN OVER 8 YEARS: 1 to 2 milligrams/kilogram orally twice daily for six weeks, PLUS ONE OF FOLLOWING: gentamicin, streptomycin, rifampin.
    c) DOXYCYCLINE RECOMMENDATION (Neurobrucellosis) (Gilbert et al, 1999):
    1) ADULTS: 100 milligrams orally twice daily for eight to twelve weeks, PLUS gentamicin (or streptomycin) PLUS rifampin.
    2) CHILDREN OVER 8 YEARS: 2 milligrams/kilogram orally twice daily for minimum of eight weeks (longer for chronic or protracted cases), PLUS gentamicin PLUS rifampin.
    2) GENTAMICIN
    a) INDICATIONS: An aminoglycoside such as gentamicin given in combination with two or three drugs is treatment of choice for uncomplicated and complicated cases (including neurobrucellosis) in both adults and children. Many authorities have replaced streptomycin with gentamicin; gentamicin is preferred for treatment of neurobrucellosis because of better CNS penetration (Gilbert et al, 1999; Malik, 1997) Habeeb, 1998; Akdeniz, 1998; Hull, 1990; Lubani, 1989).
    b) GENTAMICIN RECOMMENDATION (Uncomplicated brucellosis) (Gilbert et al, 1999):
    1) ADULTS: 2 milligrams/kilogram loading dose followed by 1.7 milligrams/kilogram intravenously every eight hours, or 5 milligrams/kilogram intravenously once daily, for first seven to ten days, PLUS EITHER doxycycline OR cotrimoxazole to complete a total course of six weeks.
    2) CHILDREN: 2 milligrams/kilogram intravenously every eight hours for first seven to ten days, PLUS EITHER doxycycline (over 8 years) OR cotrimoxazole to complete a total course of six weeks.
    c) GENTAMICIN RECOMMENDATION (Neurobrucellosis) (Gilbert et al, 1999) Habeeb, 1989):
    1) ADULTS: 2 milligrams/kilogram loading dose followed by 1.7 milligrams/kilogram intravenously every eight hours, or 5 to 7 milligrams/kilogram intravenously once daily, for two to four weeks, PLUS rifampin PLUS EITHER doxycycline OR cotrimoxazole to complete a total course of eight to twelve weeks.
    2) CHILDREN: 2 milligrams/kilogram intravenously every eight hours for two to four weeks, PLUS rifampin PLUS EITHER doxycycline (over 8 years) OR trimethoprim/sulfamethoxazole (under 8 years) to complete a minimum course of eight weeks (longer for chronic or protracted cases).
    3) STREPTOMYCIN
    a) INDICATIONS - A drug of choice, given in combination with doxycycline for treatment of uncomplicated brucellosis in adults and children over 8 years (Gilbert et al, 1999) Al-Eissa, 1990; Cisneros, 1990; Acocella, 1989; (Colmenero Castillo et al, 1989; WHO, 1986) and in combination with rifampin and either doxycycline or cotrimoxazole for neurobrucellosis in adults (Akdeniz, 1998). However, many authorities have replaced streptomycin with gentamicin, as giving IM streptomycin for an extended period makes this regimen difficult to administer in some settings; availability also may be a problem. Gentamicin is preferred for treatment of neurobrucellosis because of better CNS penetration (Hull, 1990).
    b) STREPTOMYCIN RECOMMENDATION (Uncomplicated neurobrucellosis) (Gilbert et al, 1999):
    1) ADULTS: 1 gram intramuscularly once daily for first ten to fourteen days, PLUS doxycycline to complete a total course of six weeks.
    2) CHILDREN OVER 8 YEARS: 20 to 30 milligrams/kilogram (maximum, 1 gram/day) intramuscularly in two divided doses or once daily for first ten to fourteen days, PLUS doxycycline to complete a total course of six weeks.
    c) STREPTOMYCIN RECOMMENDATION (Neurobrucellosis) (Gilbert et al, 1999):
    1) ADULTS: 1 gram intramuscularly once daily for two to four weeks, PLUS rifampin PLUS EITHER doxycycline OR cotrimoxazole to complete a total course of eight to twelve weeks (Gilbert et al, 1999) Habeeb, 1998).
    4) RIFAMPIN
    a) INDICATIONS (UNCOMPLICATED BRUCELLOSIS) - Alternative choice, given with doxycycline for treatment of uncomplicated brucellosis in adults and children over 8 years (Gilbert et al, 1999) Cisneros, 1990; Ariza, 1985; Colmenero Castillao, 1989; Kosmidis, 1982; Shehabi, 1990; Mousa, 1987a; Acocella, 1989; (WHO, 1986) Pascual, 1988; (Hall, 1990). Rifampin plus cotrimoxazole can be used for pregnant women and patients who do not tolerate tetracyclines (Al-Eissa, 1990; Shehabi, 1990; Mousa, 1987a; (Hall, 1990; Khuri-Bulos et al, 1993).
    b) INDICATIONS (NEUROBRUCELLOSIS BRUCELLOSIS) - Included in all therapeutic regimens, in combination with gentamicin and either doxycycline or cotrimoxazole, for both adults and children with neurobrucellosis (Habeeb, 1998; Akdeniz, 1998; Al-Eissa, 1995).
    c) RIFAMPIN RECOMMENDATION (Uncomplicated brucellosis) (Gilbert et al, 1999):
    1) ADULTS: 600 to 900 milligrams orally once daily for six weeks, PLUS doxycycline.
    2) CHILDREN OVER 8 YEARS: 20 milligrams/kilogram (maximum 600 milligrams) orally once daily for six weeks, PLUS doxycycline.
    d) RIFAMPIN RECOMMENDATION (Neurobrucellosis) (Gilbert et al, 1999) Habeeb, 1998):
    1) ADULTS: 600 to 900 milligrams orally once daily for eight to twelve weeks, PLUS gentamicin PLUS doxycycline.
    2) CHILDREN: 20 milligrams/kilogram (maximum 600 milligrams) orally once daily for minimum of eight weeks (longer for chronic or protracted cases), PLUS gentamicin PLUS EITHER doxycycline (over 8 years) OR cotrimoxazole (under 8 years).
    5) COTRIMOXAZOLE
    a) INDICATIONS (UNCOMPLICATED BRUCELLOSIS) - Drug of choice, given with gentamicin, for use in children under 8 years; alternative, given with gentamicin, for use in adults and children over 8 years. May be associated with higher relapse rates than other antibiotics used in brucellosis (Gilbert et al, 1999; Khuri-Bulos et al, 1993) Al-Eissa, 1990; Shehabi, 1990; (Hall, 1990).
    b) INDICATIONS (NEUROBRUCELLOSIS) - Has good CNS penetration. Drug of choice, given with gentamicin and rifampin, for children under 8 years; alternative, given with gentamicin and rifampin, for adults (Habeeb, 1998; l-Eissa, 1995).
    c) RECOMMENDATION (Uncomplicated brucellosis) (Gilbert et al, 1999):
    1) ADULTS: 1 double-strength tablet (160 milligrams trimethoprim) orally twice daily for six weeks, PLUS gentamicin.
    2) CHILDREN: 5 milligrams/kilogram trimethoprim and 50 milligrams/kilogram sulfamethoxazole orally every twelve hours for six weeks, PLUS gentamicin.
    d) RECOMMENDATION (Neurobrucellosis) (Gilbert et al, 1999) Habeeb, 1998):
    1) ADULTS: 1 double-strength tablet (160 milligrams trimethoprim) orally twice daily for eight to twelve weeks, PLUS gentamicin PLUS rifampin.
    2) CHILDREN UNDER 8 YEARS: 5 milligrams/kilogram trimethoprim and 50 milligrams/kilogram sulfamethoxazole orally every twelve hours for a minimum of eight weeks (longer for chronic or protracted cases), PLUS gentamicin PLUS rifampin.
    6) LENGTH OF ANTIBIOTIC THERAPY
    a) A prospective study was conducted to identify potential risk factors of relapse among patients (n=90) infected with brucellosis. Thirty-five (38.9%) patients received combination therapy of 2 drugs (rifampicin + cotrimoxazole or doxycycline), while 55 (61.1%) patients received a combination of 3 drugs (streptomycin + rifampicin + doxycycline). Duration of therapy ranged between 2 and 8 months. Treatment was discontinued based on both clinical improvement and seroagglutination antibody titer </= 1:80, as well as negative results for IgG and IgM antibody titers. In the group receiving two antibiotics, 60% of patients had relapse in the 2 years following completion of therapy (there was NO difference in the incidence of relapse among patients who received rifampicin + doxycycline compared to rifampicin + cotrimoxazole drug therapy). There were no cases of relapse in the patients receiving 3 drugs. In addition, in patients treated for less than 5 months the rate of relapse was 59.3%, while in patients treated for more than 5 months the rate of relapse was 7.9%. The authors suggested further studies were needed to confirm the efficacy of different regimens, and to determine which agents would best reduce relapse (El Miedany et al, 2003).
    C) CORTICOSTEROID
    1) Use of steroids in brucellosis has not been examined in controlled studies or large series of patients (Al-Eissa, 1995). There is no clear evidence for beneficial effects.
    2) Indications: Steroids may be indicated in severe, complicated brucellosis when any of the following are present (Lulu, 1988):
    1) Fever, marked toxicity, anorexia
    2) Septic shock
    3) DIC
    4) Neurobrucellosis with papilledema, myelitis, polyneuropathy, cranial nerve palsy
    5) Chronic brucellosis with iritis
    a) Steroids may also be indicated for prevention of Herxheimer-like reaction (high fever, delirium, or shock provoked by antimicrobial therapy) (Trujillo, 1994; (Radolf, 1994) Pascual, 1988).
    3) METHYLPREDNISOLONE - 10 to 40 milligrams intravenously repeated up to six times daily. For shock: 30 milligrams/kilogram intravenously infused over thirty minutes; may repeat every four to six hours, not beyond 48 to 72 hours.
    4) PREDNISONE - (Severe brucellosis): 20 milligrams orally two or three times a day for up to five days. (Prevention of Herxheimer-like reaction): 1 milligram/kilogram/day orally in three divided doses for three to four days (Trujillo, 1994; (Radolf, 1994).
    5) HYDROCORTISONE - (Prevention of Herxheimer-like reaction): 5 milligrams/kilogram/day orally in three divided doses for three to four days (Trujillo, 1994; (Radolf, 1994).
    D) FLUID/ELECTROLYTE BALANCE REGULATION
    1) Monitor fluids and electrolyte status. Dehydrated patients should receive dextrose and electrolyte solutions by IV infusion (Trujillo, 1994; (Radolf, 1994).
    E) AIRWAY MANAGEMENT
    1) In cases of airway compromise, supportive measures including endotracheal intubation and mechanical ventilation may be necessary.
    F) ABSCESS
    1) Abscesses should be drained surgically, if possible (Trujillo, 1994; (Radolf, 1994).
    G) INFECTIOUS DISEASE NOTIFICATION
    1) Brucellosis is a notifiable disease; report cases to state or local health department (CDC, 1995).
    H) Treatment should include recommendations listed in the ORAL EXPOSURE section when appropriate.

Eye Exposure

    6.8.1) DECONTAMINATION
    A) Exposed eyes should be irrigated with copious amounts of room temperature water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist after 15 minutes of irrigation, an ophthalmologic examination should be performed.
    6.8.2) TREATMENT
    A) GENERAL TREATMENT
    1) Treatment should include recommendations listed in the INHALATION EXPOSURE section when appropriate.
    B) Treatment should include recommendations listed in the ORAL EXPOSURE section when appropriate.

Dermal Exposure

    6.9.1) DECONTAMINATION
    A) INTACT SKIN - should be thoroughly washed with soap under running water.
    B) CUTS - should be encouraged to bleed, then placed under running water.
    C) Wash exposed area extremely thoroughly with soap and water. A physician may need to examine the area if irritation or pain persists after washing.
    6.9.2) TREATMENT
    A) GENERAL TREATMENT
    1) Treatment should include recommendations listed in the INHALATION EXPOSURE section when appropriate.
    B) Treatment should include recommendations listed in the ORAL EXPOSURE section when appropriate.

Summary

    A) An infective aerosol dose for humans is estimated to be 10 to 100 organisms. Fatalities are uncommon.

Maximum Tolerated Exposure

    A) GENERAL/SUMMARY
    1) COURSE: Illness severity depends in part on presence or absence of underlying disease, patient's immune status, and species involved (Trujillo, 1994; (Radolf, 1994); does not correlate with duration of illness before diagnosis (Al-Eissa, 1990), although complications occur more frequently with delay in diagnosis (Colmenero, 1996).
    2) Brucellae are highly infectious by aerosol and can survive for 6 weeks in dust and 10 weeks in soil or water. The organism could be delivered as a slurry in bomblets or, theoretically, as a dry aerosol (Franz et al, 1997).
    3) For humans, an infective aerosol dose is estimated to be 10 to 100 organisms (Franz et al, 1997). Incubation period is highly variable and ranges from 5 to 60 days (CDC, 1999). Large aerosol doses may shorten the incubation period and increase clinical attack rate. Fatalities are uncommon.
    4) A reported pattern of disease severity in humans is as follows: B melitensis > B suis > B abortus > B canis (Franz et al, 1997). Person-to person transmission typically does not occur.

Toxicologic Mechanism

    A) Brucellae are facultative intracellular macrophage parasites. They localize in organs with large numbers of macrophages (eg, lung, spleen, liver, central nervous system, bone marrow, and synovium) (Franz et al, 1997). Organisms enter the body through abraded skin, conjunctiva, and nasopharyngeal, gastrointestinal, genitourinary, and respiratory mucosa (Trujillo, 1994; (Radolf, 1994).
    B) Organisms enter bloodstream and lymphatic vessels and multiply within polymorphonuclear leukocytes and tissue macrophages of lymphatics and regional lymph nodes; disseminated via bloodstream (Arlett, 1996).
    1) Brucellosis spp localizes preferentially in tissues having an abundance of reticuloendothelial cells (lymph nodes, spleen, liver, bone marrow); kidneys, central and peripheral nervous systems, testes, endocardium, and bone also may be involved.
    C) Cytotoxic activity of natural killer cells in peripheral blood mononuclear cells is impaired in acute brucellosis; interaction of Brucella species with macrophage derived cytokines appears to be implicated in intracellular survival and proliferation of Brucella organisms (Salmeron, 1992; (Arlett, 1996). Brucellae may inhibit fusion in macrophages of phagosomes and lysosomes, and replicate in the phagosome ((Hoover, 2000)).
    D) Replication of the Brucellae can also occur extracellularly in host tissues. Histopathologically, a host cellular response can range from abscess formation to lymphocytic infiltration to granuloma formation with caseous necrosis ((Hoover, 2000)).
    E) Effective immune response is dependent on T-cell mediated immunity with secretion of cytokines to activate macrophage bacteriocidal mechanisms and attract inflammatory cells to promote granuloma formation (Arlett, 1996).

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