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Brucellosis

Brucellosis. A zoonosis. Brucella spp. Gram negative, coccobacilli bacteria Facultative, intracellular organism Multiple species. Species. Brucella melitensis: most common B. abortus B. suis B. canis. Transmission to Humans. 1) Conjunctiva or broken skin contacting infected tissues:

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Brucellosis

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  1. Brucellosis A zoonosis

  2. Brucella spp. • Gram negative, coccobacilli bacteria • Facultative, intracellular organism • Multiple species Center for Food Security and Public Health Iowa State University - 2004

  3. Species • Brucella melitensis: most common • B. abortus • B. suis • B. canis Center for Food Security and Public Health Iowa State University - 2004

  4. Transmission to Humans 1) Conjunctiva or broken skin contacting infected tissues: • Blood, urine, vaginal discharges, aborted fetuses, placentas 2) Ingestion: • Raw milk & unpasteurized dairy products • Rarely through undercooked meat Center for Food Security and Public Health Iowa State University - 2004

  5. Transmission to Humans 3) Inhalation of infectious aerosols: • Pens, stables, slaughter houses 4) Inoculation with vaccines 5) Person-to-person (sexual, congenital, breast-feeding) is rare • Incubation varies • 7-21 days to several months Center for Food Security and Public Health Iowa State University - 2004

  6. Who is at Risk? 1) Occupational Disease • Cattle ranchers/ dairy farmers • Veterinarians • Abattoir workers • Meat inspectors • Lab workers 2) Hunters 3) Travelers Center for Food Security and Public Health Iowa State University - 2004

  7. 4) Consumers of unpasteurized dairy products Center for Food Security and Public Health Iowa State University - 2004

  8. B. melitensis • B melitensis is thought to be the most virulent and causes the most severe and acute cases of brucellosis; it is also the most prevalent worldwide. Center for Food Security and Public Health Iowa State University - 2004

  9. 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

  10. 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

  11. Human Disease • Neurological: • Depression, meningitis • Cardiovascular: • Endocarditis resulting in death Center for Food Security and Public Health Iowa State University - 2004

  12. 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

  13. 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

  14. 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

  15. 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

  16. 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

  17. 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

  18. Prevention and Control • Immunize in areas of high prevalence • Young goats and sheep • Calves • No human vaccine • Eradicate reservoir • Identify, segregate, or cull infected animals Center for Food Security and Public Health Iowa State University - 2004

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