New study estimates prevalence of undiagnosed HIV in children in sub-Saharan Africa

Over the past two decades, important progress has been made in implementing services to prevent mother-to-child (vertical) transmission of HIV and to access and uptake of HIV testing for infants and children in countries with a high HIV burden. During the period of upscaling, however, many children living with HIV did not receive HIV testing, and gaps remain in efforts to test all HIV-exposed infants and children.

A new study by CUNY SPH Assistant Professor Chloe Teasdale, doctoral candidate Rebecca Zimba, and colleagues from ICAP at Columbia University provides the first national estimates of the prevalence of undiagnosed HIV in children based on population-level data from sub-Saharan Africa. The findings were published Tuesday in The Lancet HIV.

Using data from the Population-based HIV Impact Assessment (PHIA) surveys conducted in Eswatini, Lesotho, Malawi, Namibia, Tanzania, Zambia, and Zimbabwe from 2015 to 2017, the researchers estimated that close to 40 percent of children aged 1-14 years of age who are living with HIV across these seven countries were undiagnosed, amounting to 166,000 children living with HIV who were not diagnosed or on antiretroviral therapy (ART). They found that, among all children living with HIV in the seven countries, only 55 percent were on ART and only 33 percent had a suppressed viral load. There was substantial variation by country in the prevalence of undiagnosed HIV and pediatric ART coverage, and the authors found that the countries with the highest prevalence of missed diagnosis also had the lowest ART coverage among all children living with HIV.

The findings underscore the urgent need to accelerate HIV testing in order to identify undiagnosed children living with HIV and to ensure that they initiate treatment. This is extremely important as children living with HIV who are not on ART face high risk of mortality. Unfortunately, children continue lag behind adults in treatment coverage, currently only about half of children living with HIV are on ART. To address the treatment gap in children, we must improve pediatric testing coverage, Teasdale says.

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