The individual was at Universal Studios Hollywood from approximately 10 a.m. to 9 p.m. while infectious, according to public health officials. The alert does not mean that Universal Studios itself is experiencing an outbreak. The Aftermath of Measles ExposurePeople who were at Universal Studios Hollywood during the identified exposure period may be at risk of developing measles for 7 to 21 days after exposure. Understanding Measles: From Early Symptoms to the RashMeasles is a highly contagious respiratory infection caused by the measles virus. The warning is therefore more than a notice for Universal Studios visitors.