SARS-CoV-2 Gamma and Delta Variants of Concern Might Undermine Neutralizing Activity Generated in Response to BNT162b2 mRNA Vaccination
The Delta variant raised concern regarding its ability to evade SARS-CoV-2 vaccines.We evaluated a serum neutralizing response of 172 Italian healthcare workers, three months after complete Comirnaty (BNT162b2 mRNA, BioNTech-copyright) vaccination, testing their sera against viral isolates of Alpha, Gamma and Delta variants, including 36 subjects w