Figure 2

Parasite densities by microscopy among HRP2-based RDT-negative (red) and RDT-positive (blue) isolates. False-negative RDT results were more likely to occur at low microscopy parasite densities, with geometric means of 959 (geometric standard deviation [SD] 4.2) and 4675 (geom. SD 6.9) parasites/µL for RDT-negative versus RDT-positive samples, respectively (t-test p < 0.001). RDT rapid diagnostic test.