Thach, Pham Ngoc, Nguyen Tuan Anh, Nguyen Viet Hang, and Le Van Duyet. “Two Recovered COVID-19 Cases Testing Positive Again for SARS-CoV-2 After Discharge in Hanoi, Vietnam”. Archives of Clinical and Medical Case Reports 4, no. 5 (September 3, 2020): 766–773. Accessed June 15, 2026. https://fortunejournals.org/ojs/index.php/acmcr/article/view/22381.