WHO: What’s New in Treatment Monitoring: Viral Load and CD4 Testing—Information Note

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World Health Organization, 2017.

Monitoring of individuals on ART is important to ensure treatment efficacy and improved health outcomes. This information note highlights key facts on viral load and CD4 testing for treatment monitoring based on the 2016 WHO Consolidated Guidelines on the use of antiretroviral drugs for treating and preventing HIV infection. It provides definitions of virological failure, immunological failure, and clinical failure for adults, adolescents, and children and provides the viral load testing strategy.