Unvaccinated Amtrak Passenger Triggers Measles Alert Across Six California Counties

California health officials warned of measles exposure in Alameda, Butte, Kern, Los Angeles, Sacramento and San Joaquin counties after an infected, unvaccinated passenger rode Amtrak trains and thruway buses. The traveler arrived in Los Angeles on 10 September, then traveled to Bakersfield, Stockton, Oroville, Sacramento and Emeryville before leaving for Denver.