Evaluation of the epidemiological profile of vaccination against the H1N1 virus in the state of Piauí, Brazil. Research, Society and Development, [S. l.], v. 9, n. 10, p. e3729108626, 2020. DOI: 10.33448/rsd-v9i10.8626. Disponível em: https://www.rsdjournal.org/rsd/article/view/8626. Acesso em: 6 dec. 2025.