Researchers recommend postponing second dose of Pfizer vaccine as highly effective first
[ad_1] (Reuters) – Pfizer Inc.’s second dose of COVID-19 vaccine may be delayed to cover all priority groups because the first is highly protective, two Canadian researchers said in a letter published in the New England Journal of Medicine . The vaccine was 92.6% effective after the first dose, Danuta Skowronski and Gaston De Serres … Read more