Representative image GUWAHATI: Lack of health infrastructure to deal with possible adverse affects after immunization is the principal reason why the Covid vaccination drive cannot be fanned out to rural and remote areas immediately. There was overwhelming response to the third phase of the drive beginning March 1, especially in government hospitals. But no one in the health department can say when this drive would reach the level of health sub-centre in the villages. The vaccine is available in seven medical colleges, district-level hospitals and some primary health centres (PHCs) till the cold chain points exist. Following the Centre’s guidelines, the Assam government on Wednesday allowed private hospitals to administer the doses in conformation with government norms.