Israeli study shows 4th shot of COVID-19 vaccine less effective on Omicron

A fourth shot of COVID-19 vaccine boosts antibodies to even higher levels than the third jab but it is not enough to prevent Omicron infections, according to a preliminary study in Israel.

"Yet, this is probably not enough for the Omicron," she told reporters. "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."