Fred Echols | St. Louis Public Radio

Fred Echols

A person prepares a measles-mumps-rubella vaccine, which protects against 93-97 percent of measles cases. Health officials say a case has been reported in Jefferson County.
Matthew Lotz / U.S. Air Force

The St. Louis Department of Health is urging people to receive a measles shot before the busy summer travel season begins.

The U.S. largely eradicated measles decades ago thanks to effective immunizations, but the disease has had a resurgence of recent years as more people choose to not vaccinate their children.

Many of the outbreaks nationwide this year have occurred after people have traveled to countries where the disease is more common and spread it to under-vaccinated communities, according to the Centers for Disease Control and Prevention.