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California Public Health Officials Issue Six-County Measles Exposure Warning Following Amtrak Travel
Just the facts
State health authorities reported that the infected individual entered California on September 10, 2026, aboard an Amtrak train arriving in Los Angeles before traveling through Bakersfield, Stockton, Oroville, Sacramento, and Emeryville. Assistant State Public Health Officer Rita Nguyen confirmed that members of the public who frequented those transit stations or traveled on the same routes were potentially exposed to the virus. The exposure warning covers Alameda, Butte, Kern, Los Angeles, Sacramento, and San Joaquin counties as state officials work alongside federal partners to identify exposed individuals. The incident occurs alongside a broader national resurgence in measles cases, including an active outbreak in Pennsylvania that has resulted in four reported deaths.
Why this is news
The California Department of Public Health issued a public health warning after an infected, unvaccinated traveler traversed six California counties onboard Amtrak trains and buses.
Sources
This summary is compiled strictly from the original reporting below.