Resistance Testing for Management of HIV Virologic Failure in Sub-Saharan Africa

Abstract

Background: Virologic failure in HIV predicts the development of drug resistance and mortality. Genotypic resistance testing (GRT), which is the standard of care after virologic failure in high-income settings, is rarely implemented in sub-Saharan Africa. Objective: To estimate the effectiveness of GRT for improving virologic suppression rates among people with HIV in sub-Saharan Africa for whom first-line therapy fails. Design: Pragmatic, unblinded, randomized controlled trial. (ClinicalTrials.gov: NCT02787499) Setting: Ambulatory HIV clinics in the public sector in Uganda and South Africa. Patients: Adults receiving first-line antiretroviral therapy with a recent HIV RNA viral load of 1000 copies/mL or higher. Intervention: Participants were randomly assigned to receive standard of care (SOC), including adherence counseling sessions and repeated viral load testing, or immediate GRT. Measurements: The primary outcome of interest was achievement of an HIV RNA viral load below 200 copies/mL 9 months after enrollment. Results: The trial enrolled 840 persons, divided equally between countries. Approximately half (51%) were women. Most (72%) were receiving a regimen of tenofovir, emtricitabine, and efavirenz at enrollment. The rate of virologic suppression did not differ 9 months after enrollment between the GRT group (63% [263 of 417]) and SOC group (61% [256 of 423]; odds ratio [OR], 1.11 [95% CI, 0.83 to 1.49]; P = 0.46). Among participants with persistent failure (HIV RNA viral load ≥1000 copies/mL) at 9 months, the prevalence of drug resistance was higher in the SOC group (76% [78 of 103] vs. 59% [48 of 82]; OR, 2.30 [CI, 1.22 to 4.35]; P = 0.014). Other secondary outcomes, including 9-month survival and retention in care, were similar between groups. Limitation: Participants were receiving nonnucleoside reverse transcriptase inhibitor–based therapy at enrollment, limiting the generalizability of the findings. Conclusion: The addition of GRT to routine care after first-line virologic failure in Uganda and South Africa did not improve rates of resuppression. Primary Funding Source: The President's Emergency Plan for AIDS Relief and the National Institute of Allergy and Infectious Diseases.