4 wks after the first dose, Pfizer cut the risk by up to 85%; for AstraZeneca, the reduction was 94%. Among the over 80s, the combined figure was an 81% reduction. The preliminary data from the EAVE II project covers 1.14 million vaccinations given between 8 Dec & 15 February 2/2

— Allie Hodgkins-Brown (@AllieHBNews) February 22, 2021