Introduction: In a large-scale immunization program, there are concerns that there will be errors in the immuniza- tion program by health workers, such as in terms of storage or at the time of injecting vaccines. This raises a problem regarding the occurrence of adverse events following immunization (AEFI) experienced by people after vaccination. Considering that the government is the party that organizes the immunization program and procures vaccines, tech- nically, the party that administers or injects the vaccine is the health worker. Methods: This research is doctrinal legal research using a conceptual approach and a statute approach.. Results: AEFI is a medical event related to vaccine effects or effects, toxicity, side reactions, pharmacological or program errors, co-occurrence, injection reactions, or undetermined causal relationship. The increase in AEFI cases requires the government's role in handling efforts to reduce the number of AEFI cases. Monitoring and evaluation in the implementation of the immunization program is an infection necessary attempt to assess whether the activities have been carried out following applicable regula- tions. In addition, this activity must be able to identify aspects that cause cases of vaccine recipients experiencing AEFI. Conclusions: : Health workers can be personally responsible for their mistakes in administering vaccines. The government's responsibility is related to compensating people who suffer from AEFI as a form of government protec- tion for their citizens.