Investigating the Return Possibility of Covid-19 Mutated Strains and Role of Vaccination in Present and Future. Journal of Pharmaceutical Negative Results, [S. l.], p. 2043–2047, 2022. DOI: 10.47750/pnr.2022.13.S08.251. Disponível em: https://pnrjournal.com/index.php/home/article/view/3283.. Acesso em: 30 jun. 2026.