text_1: In rhesus macaques, daily subcutaneous injections of tenofovir protects against rectally transmitted simian-human immunodeficiency virus.
text_2: The risk of infection in macaques treated in groups 1 and 2 was 3.8- and 7.8-fold lower than in untreated macaques (p = 0.02 and p = 0.008, respectively).