COLUMBUS -- The measles outbreak in Ohio has grown to 341 cases in nine counties, with eight hospitalizations reported.
State health officials say it is the largest measles outbreak in the U.S. since 1994.
Health officials say the Ohio outbreak started among Knox County Amish who had traveled to the Philippines, which has had a measles epidemic. The other affected areas are Crawford, Ashland, Coshocton, Highland, Holmes, Richland, Stark and Wayne counties.
Measles is caused by a virus. Symptoms include fevers, coughs, rashes and pink eye.
Ohio health officials also are grappling with a rare outbreak of mumps, which this week reached 427 cases across three central Ohio counties.