According to preliminary Israeli research, a fourth dose of Covid-19 vaccine increases antibodies but not to the same extent as the previous jab.

Israel’s Sheba Medical Center gave second booster shots to its employees. It is currently studying the effects of Pfizer booster on 154 patients after two weeks, and Moderna booster on 120 after one week. Gili RegevYochay (director of the infectious disease unit) said that the Israeli Sheba Medical Center had given the booster shots as part of a pilot study.

They were then compared with a group who did not get the fourth shot. According to the hospital, those in Moderna had received three doses of Pfizer vaccine previously.

Regev-Yochay stated that the vaccines caused an increase in antibodies, “even slightly higher than what was after the third dose.”

According to her, “But, this may not be enough for the Omicron.” “We now know the required level of antibodies to protect against Omicron infection is likely too high to use the vaccine. Even if the vaccine works well.

According to the hospital, the findings are the first ever of their kind worldwide. However, they were not published yet.

Israel became the first country to offer initial vaccines against Covid one year ago. Last month, Israel began offering an additional booster shot to high-risk and vulnerable groups.