Long-Term Protection from SARS-CoV-2 Variants in Mice by a Phase II Clinically Evaluated Original mRNA Vaccine Booster
Introduction
The COVID-19 pandemic, caused by the SARS-CoV-2 virus, has resulted in unprecedented global health challenges. Despite the success of initial mRNA vaccines like copyright-BioNTech and Moderna in providing immunity against the virus, new variants have emerged, raising concerns about t