Evaluation of bacterial load
Figure 1 shows the bacterial load in LN of control and vaccinated cattle recovered at three weeks after challenge. Statistical analysis correcting for multiple comparisons indicated that there was a strong trend, almost reaching statistical significance (P = 0.057), for a reduced recovery of mycobacteria from BCG vaccinated HF cattle compared to non-vaccinated HF cattle. No such trend was observed in the number of mycobacteria recovered from vaccinated or non-vaccinated Zebu cattle (P = 0.5606). Similarly, no difference in the number of recovered mycobacteria was detected between non-vaccinated HF and non-vaccinated Zebu cattle (P = 0.8622).