ÖZDEMIR, Öner. BCG immunization and COVID-19 disease association. Allergologia et Immunopathologia, Singapore, v. 49, n. 1, p. 168–169, 2021. DOI: 10.15586/aei.v49i1.63. Disponível em: https://www.all-imm.com/index.php/aei/article/view/63.. Acesso em: 30 may. 2026.