MULTAN –A two-day anti-polio campaign to administer drops to children of the district was launched on Thursday. According to the health department sources, the follow-up campaign had been started for those children who were missing during the recent three-day campaign. The department had administered drops to 811,411 children in the district and set up 1,690 teams, which were relinquished at railway station, bus stands and other public places during the three-day drive.