An Israeli hospital said preliminary research indicates a fourth dose of the COVID-19 vaccine provides only limited defense against the Omicron variant. https://t.co/5IzgS0zgqL
NEW - Israel study: 4th vaccine injection shows little effect on #Omicron infections, increases in antibodies only "slightly higher" than following the 3rd dose.https://t.co/0WuzuGKikS
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