Nguyen HKL, Nguyen SV, Hoang PMV, Le TT, Tran H thi T, Nguyen LHP, Pham TQ, Nguyen TT, Dang AD, Nguyen AP, Le M thi Q. Virological characteristics of cases of COVID-19 in northern Viet Nam, January–May 2020. Western Pac Surveill Response J [Internet]. 2021 Dec. 22 [cited 2024 Apr. 26];12(4):6. Available from: https://ojs.wpro.who.int/ojs/index.php/wpsar/article/view/833