..... Professor Gili Regev-Yochay, head of the Infectious Diseases Department at the Gertner Institute for Health Policy and Epidemiology, on Saturday night briefed reporters on a new research done at Sheba Medical Center. The research showed that the COVID-19 vaccine is four times less effective against the Omicron variant than it was against the Delta variant. "Those who are vaccinated with a third dose have a much lower chance of serious disease from the Omicron variant, but there is still a chance they will contract it," Prof. Regev-Yochay said. According to her, the less great news is that those who...