LAHORE  -  Punjab Emergency Operations Cente Coor­dinator and head of the polio programme Mr Khizer Afzaal has disclosed that sub-national polio campaign which was set to begin by February-end has been converted to National Immunization Days which will be held all over Punjab. He was presiding over a meeting on Tuesday held to review the quality of January and November Na­tional Immunization Days. District Health Management Teams of 36 districts of Pun­jab participated in the meeting via a video link.