Published: Jan 17, 2022, 22:36 IST | Updated: Jan 17, 2022, 22:36 IST
Israel was one of the first countries to offer four doze of the covid-19 vaccine to people or a second booster. Now a latest Israeli study has revealed that the fourth dose of the Pfizer's Moderna vaccine against covid-19 is only partially effective against the latest omicron variant.