https://www.siliconvalley.com/2021/01/28/novavaxs-coronavirus-vaccine-works-but-is-less-effective-against-variants/ > By Lauran Neergaard | Associated Press > Novavax Inc. said Thursday that its COVID-19 vaccine appears 89% effective based on early findings from a British study and that it also seems to work — though not as well — against new mutated strains of the virus circulating in that country and South Africa.