RENBP and infection: Longitudinal studies that captured viral load measurements from early in infection (16, –, 30) show that for some individuals, several days can pass between when viral loads reach potentially infectious levels and when viral loads rise to the limits of detection (LODs) of Ag-RDTs (~105 to 107 copies/mL) (4, 6, –, 10, 20, 21, 31).