IFNG and tuberculosis: Figure 2 showed the distribution of two groups. For the healthy controls, the r-value was 0.4411 with a p value of 0.0147. And the monkeys with naturally acquired tuberculosis gave the r-value of 0.4320 and p value of 0.0171. Results showed that moderate positive correlation between IP-10 and IFN-γ existed in both healthy controls and monkeys with naturally acquired tuberculosis (0.3 < r < 0.5).