An EPI schedule refers to the Expanded Program on Immunization, which is a World Health Organization program with the goal of making vaccines available to all children. The EPI aims to strengthen vaccine programs, supply, and delivery, and ensure universal access to all relevant vaccines for all at risk. The EPI recommends 13 vaccines (antigens) including Bacillus Calmette-Guérin (BCG), diphtheria, pertussis, tetanus, Haemophilus influenzae type B (Hib), Hepatitis B (HepB), polio, measles, rubella, pneumococcal disease (PNC), rotavirus (Rota), human papillomavirus (HPV), and COVID-19 (for adults) . The EPI schedule is designed to ensure that all children receive the recommended vaccines at the appropriate times. The timing of all doses may be either recommended or compulsory, depending on the country of residence. The EPI has been successful in increasing vaccination coverage and expanding the number of diseases that can be prevented through vaccination.