A fourth dose of Covid-19 vaccine boosts antibodies five-fold a week after the shot is administered, Israeli Prime Minister Naftali Bennett said on Tuesday, citing preliminary findings of an Israeli study.“A week into the fourth dose we know to a higher degree of certainty that the fourth dose is safe,” Bennett said at Sheba Medical Centre, which is giving second booster shots in a trial among its staff amid a nationwide surge in Omicron variant infections.“The second piece of news: We know…

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