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Single jab of Pfizer’s Covid-19 vaccine less effective than expected, says Israel’s top expert

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Andriy Onufriyenko

Israel's Covid-19 tsar Professor Nachman Ash has warned that a single Covid-19 vaccine dose from Pfizer and BioNtech's two-dose vaccine regimen offers less protection than originally thought.

Although the first dose has been administered to more than 2 million people, the country with a population of 9 million, has since seen a high increase in Covid-19 infections.

According to local radio station Army Radio, Nachman said many Israelis had contracted Covid-19 in between their first and second doses, which suggested that the first dose was "less effective than we thought".

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