Jerusalem – The first dose of the Pfizer-BioNTech Covid-19 vaccine is 85 per cent effective against coronavirus infection two to four weeks later, according to a study published in The Lancet medical journal. A study conducted by Israel’s Sheba Medical Center and published on Friday (Feb 19) in The Lancet medical journal provided information on … Continue reading Study shows first dose of Pfizer vaccine 85 per cent effective after 2-4 weeks