Fig. 1.

Data. (A) Administrative subdivisions or thanas of Dhaka are divided into two groups: the core region (blue) and the periphery region (cyan), according to the grouping proposed by Reiner et al. (11). The thana in white was excluded from the analyses because of a lack of data before 2001, when it was created. The yellow dot indicates the location of the Dhaka Hospital. (B) Monthly cases of rotavirus from 1990 to 2011 aggregated by region and normalized by population size and annual flooding index (in red); the 95% confidence intervals of a binomial distribution test are shaded in light colors. (C–E) Box plot of the normalized rotavirus cases by month per region. Matlab is a rural area of Bangladesh located 55 km southeast of Dhaka.