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Mean CD4 cell count (cells/µL) among HIV patients at virologic failure, by country, for studies during the period of 2009–2020. There were no studies that reported CD4 cell counts at the time of switch to second-line ART between 2018 and 2020. One study from 2014 only reported mean and no standard deviation, represented by a circle. Abbreviation: ART, antiretroviral therapy.
