Moderna Apr 20, 2026 Sanofi touts tolerability of COVID shot Nuvaxovid in head-to-head trial vs. Moderna's mNEXSPIKE - Fierce Pharma Sanofi touts tolerability of COVID shot Nuvaxovid in head-to-head trial vs. Moderna's mNEXSPIKE - Fierce Pharma Original