Trial and failure.
D000282:Administration, Intravaginal; D000818:Animals; D000890:Anti-Infective Agents / Q000008:administration & dosage / Q000009:adverse effects; D002986:Clinical Trials as Topic / Q000592:standards* / Q000639:trends*; D005260:Female; D005782:Gels / Q000008:administration & dosage / Q000009:adverse effects; D015658:HIV Infections / Q000517:prevention & control* / Q000635:transmission*; D006801:Humans; D008297:Male; D011247:Pregnancy; D017211:Treatment Failure
D000890:Anti-Infective Agents; D005782:Gels