The health agency has confirmed five cases of measles in the area in the last 10 weeks, which is consistent with an overall increase seen in the state.
Those at St. Joseph Hospital's Emergency Department in Orange between 4:30 p.m. and 8:30 p.m. on March 2 and between 7:30 p.m. March 3 and 5 a.m. March 4 may have been exposed, officials said.
The health agency is working to contact people who may have had prolonged exposure.
Although the risk of being infected from brief contact with someone with measles is low, those who were at St. Joseph's Emergency Department at the noted times should review their vaccination history and monitor for fever or an unexplained rash for up to three weeks after exposure.
Measles is a potentially severe disease that can cause fever, rash, cough and water eyes. It spreads easily by air and direct contact with someone infected.
The disease is contagious from approximately four days before the rash appears through four days after the rash appears..
Anyone who experiences symptoms should contact a health care provider immediately.