(Lewisville) Lewisville’s ambulance service has transitioned to a community medical response unit due to a shortage of volunteers. The change took effect October first and means the department can no longer transport emergency patients.The service has just seven members and responds to about 40 emergency calls a year. Nearby communities, including Madelia, Truman and Winnebago, will handle emergency transportation for Lewisville and six surrounding townships.Local EMTs and emergency medical responders will continue providing care at the scene. Officials hope the change will bring attention to the need for more volunteers and allow the department to resume ambulance transportation in the future.