LAHORE        -        The five-day polio immunisation drive is set to begin in 33 districts of Punjab from tomorrow (Saturday).  Over 41 thousand polio teams have been constituted to vaccinate more than 17.83 million children in the drive.  Only three districts including Rawalpindi, Gujranwala and Sheikhupura have been omitted from the campaign as these have already completed the case response.