This study aims to determine the prevalence of rotavirus and adenovirus in children under 5 years old presenting with acute watery diarrhea at a tertiary hospital in Pondicherry, India. Stool samples from 354 children meeting the case definition will be tested using the rapid VIKIA® Rota-Adeno immunoassay kit. Clinical and demographic data will also be collected. Results will be analyzed to compare characteristics between rotavirus, adenovirus, and negative groups and identify any clinical predictors of rotavirus diarrhea. This cross-sectional study aims to provide local data on viral etiology of acute watery diarrhea to inform guidelines on antibiotic use and evaluate the utility of rapid testing in clinical practice.