Ohio Department of Health officials have confirmed 143 cases of measles in six counties, with the number of confirmed cases doubling in the past two weeks. Two-thirds of the cases are in Knox County. Neighboring Ashland and Holmes counties each have 19 cases. Residents of Coshocton, Richland and Wayne counties also have been infected. The outbreak started when unvaccinated Amish people returned from a trip to the Philippines, which has had a measles epidemic.