JERUSALEM (REUTERS): A fourth shot of a Covid-19 vaccine boosts antibodies to even higher levels than the third jab but it is still not enough to prevent Omicron infections, says a preliminary study in Israel.
Israel's Sheba Medical Center has given second booster shots in a trial among its staff and is studying the effect of the Pfizer-BioNTech booster in 154 people after two weeks and the Moderna booster in 120 people after one week, said Infectious Diseases Unit director Gili Regev-Yochay.
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