[1] Harvard Univ, Sch Publ Hlth, Dept Immunol & Infect Dis, Boston, MA 02115 USA
[2] Muhimbili Med Ctr, Dept Immunol & Microbiol, Dar Es Salaam, Tanzania
[3] Muhimbili Univ, Coll Hlth Sci, Dept Community Hlth, Dar Es Salaam, Tanzania
[4] Harvard Univ, Sch Publ Hlth, Dept Epidemiol, Boston, MA 02115 USA
[5] Harvard Univ, Sch Publ Hlth, Dept Nutr, Boston, MA 02115 USA