“Re-Infection of COVID-19 in Lao Health Care Workers: Vientiane Capital, Champasak and Luangphabang, Lao PDR”. International Journal of Public Health Asia Pacific 3, no. 7 (December 31, 2024): 86–96. Accessed October 5, 2025. https://www.ijphap.com/index.php/home/article/view/102.