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Brucellosis A zoonosis Center for Food Security and Public Health Iowa State University - 2004 Brucella spp. Gram negative, coccobacilli bacteria Facultative, intracellular organism Multiple species Center for Food Security and Public Health Iowa State University - 2004 Species Brucella melitensis: most common B. abortus B. suis B. canis Center for Food Security and Public Health Iowa State University - 2004 Transmission to Humans 1) Conjunctiva or broken skin contacting infected tissues: Blood, urine, vaginal discharges, aborted fetuses, placentas 2) Ingestion: Raw milk it is also the most prevalent worldwide. Center for Food Security and Public Health Iowa State University - 2004 Human Disease Flu-like illness is the most common presentation ( 80-100%). Fever is intermittent in 60% of patients with acute and chronic disease. Fever can be associated with a relative bradycardia. Constitutional symptoms include anorexia, asthenia, fatigue, malaise, and wt loss. Hepatosplenomegaly and lymphadenopathy (30%) Center for Food Security and Public Health Iowa State University - 2004 Human Disease Localized infection may be the presenting feature: Osteoarticular complications Arthritis, spondylitis, osteomyelitis Genitourinary involvement: Orchitis and epididymitis most common Center for Food Security and Public Health Iowa State University - 2004 Human Disease Neurological: Depression, meningitis Cardiovascular: Endocarditis resulting in death Center for Food Security and Public Health Iowa State University - 2004 Chronic brucellosis The diagnosis of chronic brucellosis is typically made after symptoms have persisted for 1 year or more. Low- grade fevers and neuropsychiatric symptoms predominate. Results of serologic studies and cultures are often negative Center for Food Security and Public Health Iowa State University - 2004 Diagnosis in Humans Culture of: Blood, bone marrow, CSF, urine (50% +ve) Subcultures are still advised for at least 4 weeks BM culture has higher yield. Sensitivity is usually 80- 90% Serum agglutination test Fourfold or greater rise in titer Samples 2 weeks apart The 2-mercaptoethanol test detects IgG, and titers higher than 1:160 define active infection. A high IgG titer or a titer that is higher after treatment suggests persistent infection or relapse. IgM Ab indicate recent infection. Center for Food Security and Public Health Iowa State University - 2004 Serology ELISA typically uses the cytoplasmic proteins as antigens and measures IgM, IgG, and IgA, allowing better interpretation, especially in cases of relapse Center for Food Security and Public Health Iowa State University - 2004 Treatment of Choice Combination therapy Doxycycline 100mg bd for 6 weeks + streptomycin 1g/d im for 2 wk or rifampicin 600mg/d for 6 wk In pregnancy: rifadin+ co-trimoxazole CNS cases treat 6-9 months Same for endocarditis cases plus surgical replacement of valves Center for Food Security and Public Health Iowa State University - 2004 Prognosis May last days, months or years Recovery is common Disability is often pronounced About 10% of treated cases relapse Failure to complete the treatment regimen Sequestered infection requiring surgical drainage Case-fatality rate: 2% usually from endocarditis Center for Food Security and Public Health Iowa State University - 2004 Prevention and Control Education about risk of transmission Farmer, veterinarian, abattoir worker, butcher, consumer, hunter, public Wear proper attire if dealing with infected animals/ tissues Gloves, masks, goggles Avoid consumption of raw dairy products Center for Food Security and Public Health Iowa State University - 2004 Prevention and Control Immunize in areas of high