Ohio is tied with Colorado and West Virginia for the lowest measles vaccination rate in the country.
The Trust for America's Health says 86-percent of Ohio children got the measles-mumps-rubella vaccine by the time they started preschool. An infectious disease specialist says the recent measles outbreak is caused by a lack of vaccinations. Doctor Frank Esper is with University Hospitals in Cleveland.
The Centers for Disease Control and Prevention has confirmed more than 640 measles cases in the U.S, with more than 80 cases confirmed since January 1st.