it is speculated that higher rates of gonorrhea and syphilis result from a larger mean number of sexual contacts , more potential sites of infection , and more hidden and asymptomatic disease , while the lower rates of the other std result from a lesser susceptibility of anal mucosa to the causative agent ( s ) of ngu , herpes genitalis , and venereal warts or from a lack of pubic apposition ( pediculosis pubis ) .
C0039128
syphilis
C0009450
infection