CHARLOTTESVILLE, Va. (AP) _ State health officials are investigating an illness that sickened more than a dozen University of Virginia students. Media outlets report that 15 students have sought medical treatment since Sunday for vomiting and other gastrointestinal symptoms. Student health executive director Dr. Chris P. Holstege says a possible cause is a fast-spreading stomach virus. He says most students are recovering within 24 hours. University spokesman Anthony de Bruyn says there’s no evidence at this point that the illness was food-related.