Enhanced protective efficacy of a thermostable RBD-S2 vaccine formulation against SARS-CoV-2 and its variants oleh Nidhi Mittal, Sahil Kumar, Raju S. Rajmani, Randhir Singh, Céline Lemoine, Virginie Jakob, Sowrabha BJ, Nayana Jagannath, Madhuraj Bhat, Debajyoti Chakraborty, Suman Pandey, Aurélie Jory, Suba Soundarya SA, Harry Kleanthous, Patrice Dubois, Rajesh P. Ringe, Raghavan Varadarajan