Do, Hung, Trieu Nguyen, Thuy Do, Allison Olmsted, Long Trinh, Duy Nguyen, Mai Huynh, 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 13, no. 4 (November 23, 2022). Accessed May 30, 2026. https://ojs.wpro.who.int/ojs/index.php/wpsar/article/view/977.