text_1: In rhesus macaques, daily subcutaneous injections of emtricitabine are ineffective at protecting against rectally transmitted simian-human immunodeficiency virus.
text_2: Group 1 was treated subcutaneously with a human-equivalent dose of emtricitabine (FTC), group 2 received orally the human-equivalent dosing of both FTC and tenofovir-disoproxil fumarate (TDF), and group 3 received subcutaneously a similar dosing of FTC and a higher dose of tenofovir.