Figure 2.
BCG vaccination reduced the proportion of badgers from which M. bovis was isolated from clinical samples following experimental bovine TB in badgers. Badgers were vaccinated with 2–8 × 106 CFU BCG Danish strain 1331 and then challenged 17 weeks later with endobronchial M. bovis. Samples of tracheal mucus, urine and faeces were collected fortnightly after challenge for 12 weeks. Data from two experiments were combined and the proportion of animals within each treatment group (BCG (filled squares) or non-vaccinated (filled circles)) yielding M. bovis growth from any clinical sample are shown.