Impact of prior vaccination with CovishieldTM and Covaxin® on mortality among symptomatic COVID-19 patients during the second wave of the pandemic in South India during April and May 2021: a cohort study

Kundavaram Paul Prabhakar Abhilash, Ponnivalavan Mathiyalagan, Vivek Raja K Krishnaraj, Saravanan Selvan, Rohini Kanagarajan, Narmadha P Reddy, Natarajan Rajendiran, Darpanarayan Hazra, Karthik Gunasekaran, Mahesh Moorthy, Sudha Jasmine, John P. Davis, Tina George, Krupa George, George M. Varghese, Priscilla Rupali, Tanya Isaac, Richa Gupta, Kishore Pichamuthu, Melvin Joy, L Jayaseelan, Prasad Mathews, John Victor Peter