Analysis of cases of influenza A(H1N1) in Brazil and the state of Maranhão from 2009 to 2019. Research, Society and Development, [S. l.], v. 10, n. 12, p. e453101219318, 2021. DOI: 10.33448/rsd-v10i12.19318. Disponível em: https://www.rsdjournal.org/rsd/article/view/19318. Acesso em: 5 dec. 2025.