COVID-19
Why it matters that the coronavirus is changing – and what this means for vaccine effectiveness
The French government will not accept any passengers arriving from the U.K. amid fears over the new mutant coronavirus strain. Steve Parsons/PA Images via Getty Images David Kennedy, Penn State A new variant of SARS-CoV-2 is spreading rapidly in the United Kingdom, with over 1,400 cases since September. SARS-CoV-2, the virus that causes COVID-19, generally