[1] Int Ctr Diarrhoeal Dis Res, Ctr Vaccine Sci, Bangladesh ICDDR B, Dhaka 1000, Bangladesh
[2] Int Ctr Diarrhoeal Dis Res, Ctr Nutr & Food Secur, Bangladesh ICDDR B, Dhaka 1000, Bangladesh
[3] Int Ctr Diarrhoeal Dis Res, Clin Microbiol Lab, Bangladesh ICDDR B, Dhaka 1000, Bangladesh
[4] Massachusetts Gen Hosp, Div Infect Dis, Boston, MA 02114 USA