[1] George Washington Univ, Sch Med & Hlth Sci, Washington, DC 20052 USA
[2] Baylor Coll Med, Dept Pediat & Mol Virol & Microbiol, Houston, TX 77030 USA
[3] Baylor Coll Med, Natl Sch Trop Med, Houston, TX 77030 USA
[4] Sabin Vaccine Inst, Houston, TX USA
[5] Texas Childrens Hosp, Ctr Vaccine Dev, Houston, TX 77030 USA
[6] Univ London Imperial Coll Sci Technol & Med, Schistosomiasis Control Initiat, London, England
[7] Univ London Imperial Coll Sci Technol & Med, Dept Infect Dis Epidemiol, London, England