Emerging Covid-19 subvariants and waning immunity: A renewed threat to India’s public health - Shriyansh Srivastava; Dheeraj Sharma; Malakapogu Ravindra Babu; A Muhammed Fairoos; Sachin Kumar; Aroop Mohanty; Sanjit Sah; Ranjan K. Mohapatra; Rachana Mehta (Clinical Infection in Practice, 2025)