The government’s top vaccination advisory panel, National Technical Advisory Group on Immunisation (NTAGI), has recommended reducing the interval between the two primary doses of Covishield to 8-16 weeks, while the Centre is evaluating the need for expanding the booster programme as emerging evidence suggests that a third shot can significantly enhance protection against the highly transmissible Omicron, official sources said.The government’s top vaccination advisory panel, National Technical Advisory Group on Immunisation (NTAGI), has recommended reducing the interval between the two primary doses of Covishield to 8-16 weeks, while the Centre is evaluating the need for expanding the booster programme as emerging evidence suggests that a third shot can significantly enhance protection against the highly transmissible Omicron, official sources said.