From the International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh (R.H.); the University of Vermont, Burlington (C.D.H.); and the University of Virginia, Charlottesville (M.H., E.H., W.A.P.). Address reprint requests to Dr. Petri at the Division of Infectious Diseases and International Health, University of Virginia Health System, Rm. 2115, MR4 Bldg., P.O. Box 801340, Charlottesville, VA 22908-1340, or at firstname.lastname@example.org.