- 4th vaccine shot less effective against omicron, Israeli study finds; new Va. governor faces mask pushback: Live COVID updates USA TODAY
- Israeli trial, world’s first, finds 4th dose ‘not good enough’ against Omicron The Times of Israel
- Fourth vaccine dose boosts antibodies, researchers say, but likely not enough to prevent Omicron breakthrough infections CNN
- Israel Trial Suggests 4th Dose Not Warding Off Omicron Infection Bloomberg
- Preliminary study in Israel shows fourth Covid vaccine shots are less effective against omicron CNBC
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