Bovine tuberculosis in a wild baboon population: epidemiological aspects

Area of Science:

• Veterinary Medicine
• Wildlife Disease Ecology
• Zoonotic Diseases

Background:

• Mycobacterium bovis (M. bovis) causes bovine tuberculosis, a significant zoonotic disease.
• Feral baboon populations can act as reservoirs for various pathogens.
• Previous M. bovis outbreaks in wildlife necessitated further investigation into transmission dynamics.

Purpose of the Study:

• To investigate the epidemiological source of a Mycobacterium bovis outbreak in a Kenyan feral baboon population.
• To assess the transmission routes and prevalence of M. bovis in baboons one year after initial detection.
• To evaluate the potential for baboon-to-baboon M. bovis transmission.

Main Methods:

• Necropsy of euthanized, clinically ill baboons to identify M. bovis infection.
• Tuberculin skin testing in live baboons to assess infection status.
• Analysis of feeding habits and potential exposure sources, including village slaughterhouse offal.

Main Results:

• The primary source of M. bovis infection in baboons was identified as consumption of offal from M. bovis-infected cattle at village slaughterhouses.
• Necropsy and tuberculin testing confirmed M. bovis infection in a subset of the baboon population.
• Evidence suggested minimal direct baboon-to-baboon transmission of M. bovis.

Conclusions:

• Consumption of contaminated slaughterhouse offal is a significant risk factor for M. bovis infection in feral baboons.
• Environmental contamination and consumption of infected animal products are likely the main drivers of M. bovis outbreaks in this baboon population.
• Further research on wildlife-livestock interfaces is crucial for controlling zoonotic disease spread.