A fourth dose of a Covid-19 vaccine increases antibodies in the blood fivefold after one week, Israel’s prime minister said, citing a preliminary study the day after the country began rolling out the jabs.
Israel began offering a fourth dose of the BioNTech/Pfizer vaccine on Monday to Israelis over the age of 60 and medical workers amid spiking case numbers due to the Omicron coronavirus variant.
Prime Minister Naftali Bennett said the findings of the study, by Israeli researchers, were promising.
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