DO, Hung et al. Systematic sequencing of imported cases leads to detection of SARS-CoV-2 B.1.1.529 (Omicron) variant in central Viet Nam. Western Pacific Surveillance and Response, Manila, Philippines, v. 13, n. 4, 2022. DOI: 10.5365/wpsar.2022.13.4.977. Disponível em: https://ojs.wpro.who.int/ojs/index.php/wpsar/article/view/977. Acesso em: 3 jun. 2026.