PDR levels per antiretroviral drug. Avila-RíosSantiago García-MoralesClaudia Matías-FlorentinoMargarita Tapia-TrejoDaniela Hernández-ÁlvarezBismarck F. Moreira-LópezSumaya E. Quant-DuránCarlos J. Porras-CortésGuillermo Reyes-TeránGustavo 2016 <p>PDR levels per drug were estimated using the Stanford HIVdb tool, from Sanger sequences, and classified according to the Stanford Score (SS) as high: SS≥60, intermediate: SS 30–59, or low: 15–29.</p>