A serological survey in rural Thailand demonstrated that inhabitants acquired antibody to rotavirus between the ages of 6 months and 6 years, to Norwalk virus between the ages of 4 and 5 years, and to hepatitis A between the ages of 6 and 35 years. Antibody of Escherichia coli heat-labile toxin was most prevalent between 1 and 4 years and 18 and 25 years of age.
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Echeverria et al. (1983) studied this question.
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