1. Department of Microbiology, Institute of Child Health, Dhaka Shishu Hospital,1 and
2. Popular Diagnostic Centre,2 Dhaka, Bangladesh;
3. Department of International Health, School of Hygiene and Public Health, The Johns Hopkins Medical Institutions, Baltimore, Maryland3;
4. Office of Health, Save the Children Federation, Washington, D.C.4; and
5. Department of Internal Medicine, Institute of Tropical Medicine, Nagasaki University, Nagasaki, Japan5