Fig 4.

FP rate of the HRP2-RDT Paracheck-Pf for each time point stratified by groupings of participants who showed different ranges of initial parasitemia by TBS: (I) <1,000 parasites/µL (ii); 1,000 to 10,000 parasites/µL; (iii) 10,000 to 100,000 parasites/µL; and (iv) >100,000 parasites/µL. FP is expressed in percentage. A result of 100% FP represents a positive HRP2-RDT result while parasites are not detectable anymore. However, a 0% FP can have two interpretations, either there are detectable parasites for all participants within the group, resulting in a positive RDT test, or there are no detectable parasites in all participants in the group and the RDT test shows a negative result.