human immunodeficiency virus aids AIDS pre-exposure prophylaxis HIV/AIDS pre-exposure prophylaxis http://purl.bioontology.org/ontology/MEDDRA/10073527 AIDS pre-exposure prophylaxis HIV pre-exposure prophylaxis One of a number of HIV prevention strategies for people who are HIV negative but who also have higher-than-average risk of contracting HIV, including sexually active adults at increased risk of HIV (e.g. men who have sex with men), people who engage in injection drug use (see drug injection), and serodiscordant sexually active couples.[ pre-exposure prophylaxis prophylaxis against HIV infection HIV/AIDS prevention