There is no confirmed case of measles at a Lancaster County preschool, though a Wednesday social-media rumor alluding to one has jangled the nerves of its staff. “It’s just a rumor, nothing more at this time,” said S.C. Department of Health and Environmental Control spokesman Tim Kelly. “It popped up on Facebook last night.” The rumor flamed higher Thursday morning with WCNC in Charlotte reporting that a case of measles was confirmed at Shiloh Sonshine Preschool.