Muthuprasanna Pichandy, Komala M, and Padmavathy J. “COVID-19 – A Review from Endemic to Pandemic Spread of the Virus”. International Journal of Pharma and Bio Sciences 11, no. 3 (September 30, 2020): 69–94. Accessed July 23, 2026. https://ijpbs.net/index.php/journal/article/view/6837.