Study helps explain SARS-CoV-2 variants' rapid spread  Mirage NewsCOVID-19 infection comes with long-lasting immunity, however—immunity might vary depending on the emerging variant  The Peter Doherty Institute for Infection and ImmunityComparative mortality rates of SARS-CoV-2 and influenza in France before and after the COVID-19 pandemic  News-Medical.NetNeonatal and maternal outcomes following SARS-CoV-2 infection and COVID-19 vaccination: a population-based matched cohort study  Nature.comStudy finds evidence of SARS-CoV-2 exposure in many patients with postviral syndrome  News-Medical.Net