Diarrhea surveillance.
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For the duration of the study period from March to August 2009, a monthly visit was made to each child's household by a health technician to obtain 2-week recall data from the child's primary caregiver on the presence of diarrhea in the enrolled child. Diarrhea was defined as three or more loose stools over a 24-hour period. Surveillance data were collected using Pocket PC Creations v. 5.0 for rapid entry into handheld PCs (HP iPAQ 110 Windows Mobile Handheld, Hewlett-Packard Company, Palo Alto, CA).