The Oklahoma State Department of Health has confirmed a case of measles in Oklahoma City and is investigating potential public exposure. Officials say they were notified of the case on March 31 and began an immediate investigation. They have determined that the individual was in public settings while contagious.

The potential exposure occurred between 6:15 and 10 p.m. on March 23 at Oklahoma Children’s Hospital OU Health.

The measles outbreak centered in the South Plains region soared past a combined 500 cases in Texas, New Mexico and Oklahoma on Friday, according to health officials. Texas has seen 481 measles cases amid the outbreak that began in late January,