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To study the natural history of rotavirus infection and to determine the protection it confers against reinfection and diarrhea, 200 newborns in Guinea-Bissau were prospectively followed for up to 2 years. Rotavirus was detected in stool specimens collected weekly. By age 2 years, the incidence of primary rotavirus infection was 74%. In the first 3 months of life, 17% of the infections were diarrhea associated, compared with 60% at 9-11 months; after age 18 months, all infections were asymptomatic. A primary infection conferred 52% (95% confidence interval [CI], 16% to 73%) and 70% (95% CI, 29% to 87%) protection against subsequent rotavirus infection and rotavirus diarrhea, respectively. The protection was 66% (95% CI, 24% to 85%) against reinfection within the same epidemic, compared with 34% (95% CI, -29% to 67%) against reinfection in any subsequent epidemic. The high level of protection against symptomatic rotavirus infection provides an important incentive for development of a rotavirus vaccine.

Protective Immunity after Natural Rotavirus Infection: A Community Cohort Study of Newborn Children in Guinea‐Bissau, West Africa