Laws, Rebecca L.Biraro, SamKirungi, WilfordGianetti, BrittanyAibo, DorothyAwor, Anna C.West, ChristineSachathep, Karampreet K.Kiyingi, HerbertWard, JenniferMwangi, ChristinaNkurunziza, Peter2022-03-202022-03-202021Laws, R. L., Biraro, S., Kirungi, W., Gianetti, B., Aibo, D., Awor, A. C., ... & Voetsch, A. C. (2021). Coronavirus Disease 2019 (COVID-19) Mitigation Efforts and Testing During an In-Person Training Event—Uganda, 12–29 October 2020. Clinical Infectious Diseases, 73(Supplement_1), S42-S44.https://doi.org/10.1186/1471-2334-12-3811471-2334https://nru.uncst.go.ug/xmlui/handle/123456789/2840Viral load monitoring (VLM) to identify individuals failing antiretroviral therapy (ART) is not widely available in resource-limited settings. We compared the genotypic resistance patterns between clients with VLM versus immunological monitoring (IM).Between 2004–2008, 559 ART naïve clients were enrolled in a prospective cohort, initiated on ART, and monitored with viral load (VL) and CD4+ cell counts every 6 months (VLM group). From February 2008 through June 2009, 998 clients on ART for 36–40 months (corresponding to the follow-up time of the VLM group) at the same clinic and monitored with CD4+ cell counts every 6 months were recruited into a cross sectional study (IM group). Samples from VLM clients at 12, 24 and 36 months and IM clients at 36–40 months with VL > 2000 copies/ml underwent genotypic drug resistance testing.Baseline characteristics were similar. Virologic failure (VL > 400 copies/ml) at 12, 24 and 36 months in the VLM group were 12%, 6% and 8% respectively, and in the IM group 10% at 36–40 months. Samples from 39 VLM and 70 IM clients were genotyped. 23/39 (59%) clients in the VLM group (at 12, 24 or 36 months) compared to 63/70 (90%) in the IM group, (P < 0.0001) had at least 1 non-nucleoside reverse transcriptase mutation. 19/39 (49%) of VLM clients had an M184V mutation compared to 61/70 (87%) in the IM group (P < 0.0001). Only 2/39 (5%) of VLM clients developed thymidine analogue mutations compared to 34/70 (49%) of IM clients (P < 0.0001).Routine VL monitoring reduced the rate of accumulated genotypic resistance to commonly used ART in Uganda.enArticle