A nurse shows a vial of the Pfizer-BioNTech Covid-19 vaccine at the Santo Tomas Hospital, in Panama City, Panama February 17, 2021. — Reuters picJERUSALEM, Feb 19 — The first dose of Pfizer Inc’s COVID-19 vaccine is 85 per cent effective, a study of healthcare workers at an Israeli hospital has found, potentially fuelling a debate over the recommended two-dose schedule as governments try to stretch out supplies.
Their research showed efficacy of 92.6 per cent after the first dose, based on an analysis of the documents submitted by the drugmaker from its late-stage human trials to the US Food and Drug Administration in December. Pfizer has said alternative dosing regimens of the vaccine have not been evaluated yet and that the decision resided with the health authorities.
Sheba epidemiologist Gili Regev-Yochay cautioned that the cohort studied at the hospital were “mostly young and healthy”.
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