... The determination of samples of key informants and additional informants Prabaningtyas, A. D., Amiruddin, R., Arsin, A. A., Hidayanty, H., Wahyuni, C. U., Salmah, U., Saleh, L. M., Nasir, S., Prabaningtyas, A. D., Amiruddin, R., Arsin, A. A., Hidayanty, H., Wahyuni, C. U., Salmah, U., Saleh, L. M., Nasir, S., . Determinant Factors of Acceptance of COVID-19 Booster Vaccine in Elderly in Bogor City 7 Source: Kementrian Kesehatan RI (2023b), Mcleroy et al., (1988), Rosenstock, (1974) The researchers conducted information gathering to obtain information from the three informants by preparing interview guidelines based on the SEM theory and HBM theory. The SEM theory contains a theoretical framework using a comprehensive approach to explore every role, the role of the community, the organization, and the elderly families. ...