[1] Univ Maryland, Sch Med, Dept Med,Div Geog Med, Mol Parasitol & Malaria Field Studies Unit, Baltimore, MD 20201 USA
[2] Johns Hopkins Sch Hyg & Publ Hlth, Dept Prevent Med, Baltimore, MD USA
[3] Johns Hopkins Sch Hyg & Publ Hlth, Dept Int Hlth, Baltimore, MD USA
[4] Johns Hopkins Sch Hyg & Publ Hlth, Dept Mol Microbiol & Immunol, Baltimore, MD USA
[5] Dept Publ Hlth, Loreto, Peru