Dr. Harsh Vardhan Union Health Minister on Sunday launched a two-day vaccination campaign for encephalitis in the Muzaffarpur district of Bihar that was worst hit by an encephalitis outbreak. The acute encephalitis syndrome (AES) has so far claimed the lives of around 139 children in the state of Bihar. The Health Minister interacted with the media persons after the successful start of the immunization campaign at a primary health center in Kanti block region of Muzaffarpur district. He said 'The main aim for launching the immunization campaign was to ensure 100 percent immunization to the children in the affected areas.