COVID-19 vaccine, variants of SARS-CoV-2 Moderna says its vaccine is 90% effective against COVID-19, and 95% effective against severe disease for six months aft
COVID-19 vaccine, variants of SARS-CoV-2 Moderna says its vaccine is 90% effective against COVID-19, and 95% effective against severe disease for six months after the second dose. It also says its vaccine is effective against the 501.V2 variant from South Africa. (CNBC) (The Times)