INGOLE, Ramesh D.; THALKARI, Avinash B.; KARWA, Pawan N. Is pre vaccination the reason for less morbidity and mortality for COVID-19 in India: an epidemiological study. International Journal of Advances in Scientific Research, India, v. 6, n. 5, p. e5424, 2020. Disponível em: https://www.ssjournals.co.in/index.php/ijasr/article/view/5424. Acesso em: 15 mar. 2026.