Although there is no outbreak of measles in Idaho, state and local health officials are asking residents to make sure their measles vaccinations are up to date.

Though the United States has been immunizing people against the measles for decades, outbreaks still occur around the world. According to the Centers for Disease Control, some 20 million cases occur worldwide each year.

"We always worry about people becoming exposed if they travel," said Cheryle Becker, epidemiologist manager at South Central Public Health in Twin Falls.

But measles shouldn't be a concern only for international travelers, said Emily Simnitt, public information officer with the Idaho Department of Health and Welfare.

"We have been seeing outbreaks across the country, which is pretty unusual," Simnitt said. So far this year, there have been outbreaks in several states, including Wisconsin, Arizona and Michigan. While Simnitt said no cases of measles in Idaho have been recorded, she cautioned that "it could very well happen."

Simnitt said 88 percent of school-age children in Idaho have been vaccinated.

According to the Centers for Disease Control's Web site, there have been 64 confirmed cases of measles in nine states from the beginning of the year to April 25. Of those 64 cases, all but one had no documented record of vaccination. Becker said outbreaks usually occur among small pockets of people who choose not to be immunized for religious or personal reasons.

According to the CDC, measles is a contagious disease spread by coughing or sneezing. Symptoms include a rash, fever and a runny nose, and can lead to pneumonia, ear infections and in some cases death. Individuals are usually vaccinated as children for measles, mumps and rubella. The vaccination is a combination of an initial vaccine usually given during infancy and a booster shot before the child enters kindergarten. The vaccine for the measles was first introduced in 1957, Simnitt said.

"It's one of those illnesses that people shouldn't have to experience," she said.

Sean Breslin may be reached at 208-735-3243 or sean.breslin@lee.net.