3.2 BCG vaccination
BCG is a live attenuated bacterial vaccine derived from Mycobacterium bovis that was originally isolated in 1902 from a tuberculous cow. BCG has demonstrated significant effectiveness, but protection has not been consistent against all forms of TB in all age groups. BCG has also shown effectiveness in preventing leprosy (caused by Mycobacterium leprae) and Buruli ulcer (caused by Mycobacterium ulcerans) (31).