[1] NIAID, Immunopathol Sect, Parasit Dis Lab, NIH, Bethesda, MD 20892 USA
[2] USDA ARS, Nutrient Requirements & Funct Lab, Beltsville Human Nutr Res Ctr, Beltsville, MD USA
[3] Biomed Res Inst, Rockville, MD 20852 USA
[4] Wyeth Res, Cambridge, MA USA
[5] Harvard Univ, Sch Publ Hlth, Dept Immunol & Infect Dis, Boston, MA 02115 USA