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Transmitted drug resistance (TDR) is a concern because it may reduce the efficacy of antiretroviral treatment. Plasma samples of 119 HIV‐1‐infected patients who were newly diagnosed at the Infectology Center of Latvia in 2005 and 2006 were analyzed by an in‐house genotypic resistance assay to determine the prevalence of TDR in Latvia. TDR was identified using the WHO 2009 list of mutations for surveillance...