Geisinger is notifying patients and the public about a potential measles exposure at Geisinger Medical Center in Danville after a visitor suspected of having the highly contagious illness was on the hospital campus earlier this week.According to Geisinger, the health system learned that a visitor with a high suspicion of measles was present at Geisinger Medical Center between 1 p.m. Wednesday, August 12, and 9 p.m. Thursday, August 13, 2026.Foll…