SHRESTHA, U. K. SARS-CoV-2 vaccines and their challenges against the variants. Journal of Advances in Internal Medicine, [S. l.], v. 10, n. 1, p. 1–3, 2021. DOI: 10.3126/jaim.v10i1.37080. Disponível em: https://www.nepjol.info/index.php/JAIM/article/view/37080. Acesso em: 5 oct. 2024.