Israeli Study: 4th Booster Shot No Match For Omicron Variant

Expert at Sheba Medical Center says jab raises COVID antibody levels, but there are ‘still a lot of infections’ among those who received it

Health care staff receive a 4th dose of the Moderna COVID-19 vaccine, at the Sheba Medical Center on January 5, 2022. (Avshalom Sassoni/Flash90)


Nearly a month after Sheba Medical Center launched a landmark study to test the efficacy of a fourth COVID shot, the hospital said Monday that this fourth booster was only partially effective in protecting against the Omicron strain.

“The vaccine, which was very effective against the previous strains, is less effective against the Omicron strain,” Prof. Gili Regev-Yochay, a lead researcher in the experiment said.


“We see an increase in antibodies, higher than after the third dose,” Regev-Yochay said. “However, we see many infected with Omicron who received the fourth dose. Granted, a bit less than in the control group, but still a lot of infections,” she added.

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