We report here, for the first time, a comparison of naturally acquired antibody responses to
the 42 and 19kDa C-terminal processing products of Plasmodium vivax Merozoite Surface
Protein-1 assayed by ELISA using p42 and p19 baculovirus-derived recombinant proteins,
respectively. Test populations comprised patients with microscopy confirmed acute P. vivax
infections from two regions endemic for vivax malaria where low transmission and unstable
malaria conditions prevail, and a non-endemic urban area, in Sri Lanka. The antibody …