Sahoo, Jyoti Prakash, Sudhanya Nath, Lipi Ghosh, and Kailash Chandra Samal. 2021. “Concepts of Immunity and Recent Immunization Programme Against COVID-19 in India”. Biotica Research Today 3 (2):103-6. https://biospub.com/index.php/biorestoday/article/view/728.