When One Negative HIV Test in Pregnancy May Not Be the End of the Story

A negative HIV test in pregnancy is reassuring, but it is not always the end of the prevention story. Women can acquire HIV after the first antenatal test, and new infection during pregnancy or breastfeeding has implications for maternal health and vertical transmission.

Tanzanian antenatal surveillance shows the value of the first contact: large national datasets can identify prevalence, awareness and treatment gaps among women entering care. Systematic review and meta-analysis of repeat testing during pregnancy and breastfeeding adds the next question - how often are new infections found after an earlier negative test, and which settings or groups justify repeat testing strategies?

The implementation challenge is to balance yield, cost, timing and feasibility. Universal repeat testing may identify infections that would otherwise be missed, but it also requires test kits, staff time, clear schedules and reliable linkage. Risk-based strategies may be more efficient but can miss women when risk is difficult to assess or changes over time. The meaningful endpoint is not a second test itself; it is rapid linkage to treatment and prevention when a new infection is identified.