Fig 3. Relative standard error (RSE) of incidence estimate against ODn threshold in three demonstrative surveillance scenarios.

A: Scenario similar to South African epidemic. B: Scenario similar to Kenyan epidemic. C. Concentrated epidemic scenario. A supplementary viral load threshold of >1,000c/mL is used throughout. We assume ARV exposure testing classifies all treated individuals as long-term. This assumption is relaxed in S5 Fig.