Preliminary results from the study conducted at Sheba Medical Center showed that after receiving the fourth shot, participants developed higher coronavirus antibody levels, but they were only partly effective in preventing Omicron infections.
Lead researcher Prof Gili Regev-Yochay said the third dose resulted in “much higher antibodies, neutralization and the antibodies were not just higher in quantity but also in quality” than the second dose – but the fourth vaccine did not show significant antibody increase.
”Maybe there are a few more antibodies but not much more compared to the third dose,” said Regev-Yochay.
