Categories Articles Novavax’s COVID-19 Vaccine Was Shown to be 51% Efficacious in South Africa, Where More Infectious Variants Are Spreading Post author By crystalg Post date May 6, 2021 TIME Tags 'spreading, Africa, COVID19, Efficacious, Infectious, More, Novavax’s, shown, South, Vaccine, variants ← Doctors successfully treat rare blood clotting side-effect of Johnson & Johnson COVID vaccine → Google Play’s app listings will require privacy info next year, just like the App Store