(Mumemories/Getty Images)(NEW YORK) — Los Angeles County health officials said a person infected with measles visited Universal Studios Hollywood last month and potentially exposed others to the virus. “People who are unimmunized or have unknown measles immunization status are at higher risk and should monitor for symptoms closely. A spokesperson for Universal Studios Hollywood said in a statement Friday that the park is working with the health department in their probe. Anyone who believes they have contracted measles is urged to call a doctor immediately, according to the health department. One dose is 93% effective, and two doses are 97% effective against measles, the CDC says.