FIG. 1.

Sensitivities of two modes of drug-response assessment. Tendency curves for the IC₅₀s with upper confidence intervals determined by the isotopic assay (open symbols, dotted lines) and the ELISA-Malaria antigen test assay (closed symbols, continuous lines) are shown for each drug tested with two P. falciparum strains, strains 3D7 (A) and 7G8 (B). The IC₅₀s of chloroquine (squares), monodesethyl-amodiaquine (triangles), lumefantrine (diamonds), and dihydro-artemisinin (circles) were assessed at different initial parasite densities: 0.5%, 0.1%, 0.05%, 0.01%, and 0.005%.