IFNG and infection: Upon stratification by infection group (PG/PR, PG/PR/PV), the same six parameters remained significant, and in addition white blood cells (WBC) count also became significantly associated with infection status (P-value = 0.045), with lower counts in PG/PR infected chimpanzees but higher in PG/PR/PV infected chimpanzees (Table 2; Supplementary Figure 3) and IFN-γ became significantly associated with infection status with lower levels in infected individuals (P-value =0.019; Table 2; Supplementary Figure 4).