Preliminary Israeli study shows fourth vaccine not enough to stop omicron

A preliminary study in Israel, believed to be the world's first, found that a fourth COVID-19 vaccine is not enough to prevent omicron infections.

Gili Regev-Yochay, director of Sheba Medical Center's Infectious Diseases Unit, said the trial studied the effect of the Pfizer booster after two weeks and the Moderna booster after one week, according to Reuters.

Regev-Yochay said the increase in antibodies from a fourth shot was "probably not enough for the Omicron."

"We know by now that the level of antibodies needed to protect and not to got infected from Omicron is probably too high for the vaccine, even if it's a good vaccine," she added.