Pfizer-BioNTech jabs are 70% effective against the highly contagious Delta variant of COVID-19, according to a study conducted in Israel. The results of Hebrew University's research on the vaccine's efficacy were published by the Israeli Public Broadcasting Corporation (KAN) on Sunday. The new finding is compared to the 95% rate of effectiveness of the vaccine against earlier virus strains. Delta variant, which was first detected in India, is said to ...