Implementation of Universal Rotavirus Vaccination in Indonesia: Review Article Ihsan Ramadhan1, Alpha Fardah Athiyyah2,3*, Juniastuti4,5, I Gusti Made Reza Gunadi Ranuh2,3 Abstract Background: Rotavirus is a leading cause of severe diarrhea in children under five years of age worldwide, with significant morbidity and mortality, particularly in low- and middle-income countries