Figure 3.

Antibody response to Plasmodium vivax-merozoite surface protein-11 (MSP1) block 2 specific haplotype peptides among pregnant women who have had a primary infection and a second malaria episode. Of the women, 17 had an initial infection and a relapse, which were confirmed by microscopy of the thick and thin smears of peripheral blood and polymerase chain reaction. Serology for IgM was performed against 6 haplotype-specific peptides of Plasmodium vivax-MSP1 Block 2 (a) H1 (b) H2 (c) H3 (d) H4 (e) H5 and (f) H6. Each woman was represented by a symbol and to the right of each graph are women who maintained or increased IgM levels on relapse relative to the initial infection