Loo, Ke-Yan, Angel Yun-Kuan Thye, Lydia Ngiik-Shiew Law, and Jodi Woan Fei Law. “COVID-19: An Updated Situation from Singapore”. Progress In Microbes & Molecular Biology 4, no. 1 (November 9, 2021). Accessed November 8, 2024. https://journals.hh-publisher.com/index.php/pmmb/article/view/511.