<prompt> The most common cause of diarrhea in children is-Vibrio choleraE. coliRotavirusPneumococcus  <response>: Ans. is c i.e., Rotavirus Rotavirus is the single most common cause of diarrhea amongst children in both developed and developing world. ETEC is the single most common cause of bacterial diarrhea amongst children in the developing world. ETEC is the most common bacterial cause for Travelers diarrheaQ. 