Past SARS-CoV-2 infection enhances mRNA vaccine-induced neutralization of variants of concern Researchers in the United States have conducted a study suggesting that individuals previously infected with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) exhibit better neutralizing activity against variants of concern following vaccination against coronavirus disease 2019 (COVID-19) than previously uninfected vaccinees. “Plasma from previously infected vaccinated individuals displayed overall better neutralization capacity when compared to plasma from uninfected individuals that al...