Newly Acquired Infection With Multidrug-Resistant HIV-1 in a Patient Adherent to Preexposure Prophylaxis.

To the Editors:Antiretroviral agents as preexposure prophylaxis (PrEP) against HIV-1 infection are a recent and welcome addition to the prevention toolbox. Clinical trials have shown tenofovir disoproxil fumarate/emtrcitabine (TDF/FTC) as PrEP to be safe and associated with substantial reductions (4