By in January 1, 2009, it is expected that less than 15% of children less than 2 years of age in the intervention area will have received Rotateq in the Merck trial. Nonetheless, we will stratify randomization within the intervention area by rates of participation in that trial for each village. Additionally, because we will have the full dataset for Matlab for the Rotateq trial, we will be able to analyze any impact of that Rotateq trial on the Rotarix evaluation within the intervention area.