BCG vaccination and its possible effects on the acceleration of incidence and mortality by the new coronavirus: second step. SciELO Preprints, 2020. DOI: 10.1590/SciELOPreprints.720. Disponível em: https://preprints.scielo.org/index.php/scielo/preprint/view/720. Acesso em: 20 jun. 2026.