Ollow-up; if use of these medications biased our analysis toward the null, it is possible that the effect of FTC/TDF on ulcers is stronger than what we observed in our study. Our behavioral risk factor analysis included number of anal sex partners, position during anal sex, and condom use in the lastDaily Oral FTC/TDF PrEP and HSV-2 among MSMTable 2. Baseline characteristics by time to HSV-2 seroi