Sampling and site characteristics of baboon troops in which animals were tested for T. pallidum, including seroprevalence and the prevalence of outward signs of infection with T. pallidum.

aSample seroprevalence may be inflated at GSNP, LMNP, and SNP, as some baboons were purposively sampled in the serological survey. Three of eight animals in GSNP, seven of nineteen at LMNP, and five of twenty-five at SNP were included because they displayed anogenital lesions.bGSNP has a history of antibiotic treatment of affected individuals [11], which may affect prevalence of infection there.cThe collection of biological samples was not permitted at this site.