Health officials are investigating three cases of measles from Summit County, the first reported cases of the disease in Utah since 1996.
The state Department of Health believes the three cases are a result of exposure to an international traveler.
"Measles is still around and with all the traveling people do in and out of Utah these days you never know where it will show up next," said Dr. Scott Williams, deputy director of the department.
Measles, which is a highly contagious virus, usually lasts only one to two weeks but can cause complications such as pneumonia, ear infections and encephalitis.
Symptoms include a cough, fever of more than 101 degrees, runny nose and red, watery eyes. A rash usually begins a few days later around the ears and hairline and spreads to cover the face, torso and arms.
The department urges people to make sure vaccinations are up to date, especially for children.