Persistence of immunity and impact of third dose of inactivated COVID-19 vaccine against emerging variants oleh Krishna Mohan Vadrevu, Brunda Ganneru, Siddharth Reddy, Harsh Jogdand, Dugyala Raju, Gajanan Sapkal, Pragya Yadav, Prabhakar Reddy, Savita Verma, Chandramani Singh, Sagar Vivek Redkar, Chandra Sekhar Gillurkar, Jitendra Singh Kushwaha, Satyajit Mohapatra, Amit Bhate, Sanjay Kumar Rai, Raches Ella, Priya Abraham, Sai Prasad, Krishna Ella