Steve Walz does not hide his pride. He is the spokesperson for Sheba Medical Center, a hospital in the suburbs of Tel Aviv which achieved a world first by inoculating a fourth dose of the Pfizer / BioNTech vaccine on Sunday to 150 caregivers who received a third dose last August. “They now have a serological test every other day to measure the reaction of their immune system. Within a week or two, we will better assess the safety and effectiveness of a second booster», He affirms.
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