Israeli study finds Pfizer vaccine 85pc effective after first shot

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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 pic
Nevin Al Sukari - Sana'a - 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 pic

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JERUSALEM, 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.

The Sheba Medical Center’s findings compare with overall efficacy of around 95 per cent in a two-dose regimen 21 days apart for the shot developed with Germany’s BioNTech.

The Sheba study, to be published in The Lancet medical journal, comes a day after Canadian researchers suggested that the second Pfizer dose be delayed given the high level of protection from the first shot in order to increase the number of people getting vaccinated.

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.

The FDA said in December data from those trials showed that the vaccine began conferring some protection to recipients before they received the second shot, but more data would be needed to assess the potential of a single-dose shot.

Pfizer has said alternative dosing regimens of the vaccine have not been evaluated yet and that the decision resided with the health authorities.

Sheba said among 7,214 hospital staff who received their first dose in January, there was an 85% reduction in symptomatic Covid-19 within 15 to 28 days. The overall reduction of infections, including asymptomatic cases detected by testing, was 75 per cent.

Sheba epidemiologist Gili Regev-Yochay cautioned that the cohort studied at the hospital were “mostly young and healthy”.

Unlike with Pfizer’s clinical trial, “we don’t have many (staff) here aged over 65,” she told reporters. But she also noted that the Sheba study took place during a surge in Covid-19 infections in Israel, which flooded hospitals with new cases.

Pfizer declined to comment on the data, saying in a statement it was doing its own analysis of “the vaccine’s real-world effectiveness in several locations worldwide, including Israel.” It hopes to use Israeli data to look at the potential of the vaccine to protect against Covid-19 arising from emerging variants, the drugmaker said. — Reuters

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