infection with e. histolytica was correlated significantly with a prior history of syphilis or gonorrhea ( p less than 0.0001 ) , with the number of sexual partners in the preceding 12-month period ( p less than 0.0001 ) , and with the reported frequency of oral-anal sexual contact ( p less than 0.001 ) .
C0009450
infection
C0039128
syphilis