Define prevalence: # Cases detected / # Tested.

#Tested differs at each visit and decreased with time since enrollment as many participants are still being followed up.

At the baseline visit, the prevalence of Trich was 1.1% in males, & 11.1% in females.

At follow-up visits, the prevalence of Trich ranged from 0 to 0.7% in males, & 3.1 to 7.3% in females. Trich was detected about 10 times more often in females than in males.