A second booster shot of Pfizer’s COVID-19 vaccine induced antibodies but likely not at a level high enough to protect recipients against infection from the Omicron virus variant, Israeli researchers said Monday. Sheba Medical Center has been studying 150 health care workers who received a second booster, or a fourth shot. “Two weeks after administering the fourth vaccine, we see a good increase in the antibodies, higher than after the third dose, but not high enough against Omicron,” lead researcher Prof. Gili Regev-Yochay told reporters in an online briefing. Omicron is a variant of the CCP (Chinese Communist Party) virus, which causes COVID-19. Omicron has proven better at evading antibodies induced by COVID-19 vaccines than earlier strains and has infected millions of vaccinated people around the world in recent weeks, sparking a renewed effort to get people boosted. Israel, one of the most vaccinated countries in the world, has seen case …