Sousa Almeida, P.R., Sarmento, G., Gruner, H., Veríssimo, R. and Duque, S. 2026. Vaccination of Older Adults in Portugal: Recommendations from the Geriatrics Study Group of the Portuguese Society of Internal Medicine. Acta Médica Portuguesa. (Jan. 2026). DOI:https://doi.org/10.20344/amp.23786.