Andrews, Anand, Anju C. Mathew, and Thushara Mathew. “COVID-19 Vaccination Status and Its Effect on Outcome and Disease Severity”. International Journal Of Community Medicine And Public Health 10, no. 2 (January 12, 2023): 629–634. Accessed December 3, 2025. https://www.ijcmph.com/index.php/ijcmph/article/view/10812.