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Background  Control of animal tuberculosis (TB) through vaccination has emerged as a long-term strategy to complement test and slaughter control strategy. A pilot trial under field conditions was conducted in a goat herd with high TB prevalence to assess the efficacy of the  Mycobacterium bovis  BCG vaccine.    Results  Twenty-three goat kids vaccinated with BCG and other 22 unvaccinated control kids were euthanized at 18 months post-vaccination. Gross pathological and histopathological examination of target tissues was performed for detection of tuberculous lesions and assessment of vaccine efficacy. Mycobacterial culture and DNA detection were used to confirm  Mycobacterium caprae  infection. Vaccination significantly reduced the number of animals with TB lesions compared to unvaccinated controls (35% and 77%, respectively;  P  < 0.01). This reduction was even higher if only extra-pulmonary infection was considered (17% and 68%, respectively;  P  < 0.001).    Conclusions  This trial demonstrates that BCG vaccination of goats can significantly reduce the TB lesion rates in high disease exposure conditions, indicating that vaccination could contribute to the control of TB in domestic goats.

Field evaluation of the efficacy of Mycobacterium bovis BCG vaccine against tuberculosis in goats