Vaccine Effectiveness Drops from 90% to 50% Versus South Africa Variant
Clinical trial data on two COVID-19 vaccines are less protective versus the South Africa coronavirus variant. Novavax reported midstage trial results on Thursday that showed its vaccine was 50% effective overall at preventing COVID-19 among people in South Africa. United Kingdom vaccine results were up to 89.3% effective at preventing COVID-19. Pfizer and Moderna vaccines …