title: Prevention trials starting.
mesh_terms: D000225:Adenine / Q000031:analogs & derivatives* / Q000627:therapeutic use*; D000328:Adult; D000349:Africa; D002986:Clinical Trials as Topic; D005260:Female; D015658:HIV Infections / Q000517:prevention & control*; D006801:Humans; D008297:Male; D008875:Middle Aged; D063065:Organophosphonates; D009943:Organophosphorus Compounds / Q000627:therapeutic use*; D018894:Reverse Transcriptase Inhibitors / Q000627:therapeutic use*; D000068698:Tenofovir; D014481:United States
chemical_list: D063065:Organophosphonates; D009943:Organophosphorus Compounds; D018894:Reverse Transcriptase Inhibitors; D000068698:Tenofovir; D000225:Adenine