New Delhi, June 30 -- The Union ministry of health and family welfare rolled out a special drive to identify unvaccinated children in high-burden districts to expand the national immunisation coverage, people familiar with the matter said. The drive, called zero dose implementation plan, will target 143 districts in 11 states with a high burden of children who have not received any immunisation dose so far, according to data. "As part of this plan, special immunisation camps are being held to ensure all unvaccinated children are identified and vaccinated. The larger aim is to leave no children unvaccinated," said a senior official, requesting anonymity. In a statement issued on Saturday, the health ministry said that the number of children ...