Figure 3.

Chloroquine in vitro activity and pfcrt-76 genotype. Relationship between chloroquine inhibitory concentration that kills 50% of parasitaemia (IC₅₀) as measured by 50% inhibition of [³H]hypoxanthine incorporation into parasite nucleic acid, and pfcrt genotype at codon 76 of isolates collected in 2006 in Kilifi. The dashed line indicates the cut-off level of 25 nM.