FIG. 1.

Levels of plasma antibodies recognizing PfEMP1-like molecules on the surface of intact RBC infected with late developmental stages of P. falciparum as detected by flow cytometry. Data from nine parasite isolates (3D7 to FCR3 [columns]) tested versus plasma samples obtained in January 1996 from 37 individuals (E2 to 2N3 [rows]) from Daraweesh village, Sudan, are shown. Shading indicates antibody levels above background (mean + 2 standard deviations of samples from unexposed individuals). Numbers along the right and bottom edges of the figure indicate the number of positive data points per plasma sample and parasite isolate, respectively.