Viral Suppression Can Hide Unequal Vulnerability

National HIV programmes need summary indicators, and viral suppression is one of the most important. But a strong overall percentage can conceal smaller groups for whom treatment is failing, drug resistance is emerging, or access to care remains incomplete.

Tanzanian surveillance illustrates this problem from several angles. Studies among adolescents and young adults reported high overall suppression while identifying unsuppressed participants with important resistance patterns. National resistance surveillance detected emerging integrase-inhibitor mutations among people with high viraemia. After dolutegravir rollout, a national survey again showed strong overall suppression but lower undetectable viral-load proportions among children and younger adults, with adherence remaining an important correlate. Antenatal surveillance adds a different gap: treatment coverage can look high among women already aware of their status while diagnosis and linkage remain incomplete when all women living with HIV are considered.

The lesson is not that headline indicators are misleading. It is that averages need layers. Age, treatment history, geography, stage of care and social circumstances reveal groups who may need a different response even when the programme performs well overall.