Ang, Zen Yang, Nur Zahirah Balqis-Ali, Jailani Anis-Syakira, Yuke-Lin Kong, Shakirah Md Sharif, and Weng Hong Fun. “COVID-19 Clusters in Malaysia: Characteristics, Detection Methods and Modes of Early Transmission”. Western Pacific Surveillance and Response 14, no. 4 (November 29, 2023): 11. Accessed May 8, 2024. https://ojs.wpro.who.int/ojs/index.php/wpsar/article/view/1058.