- California officials warn of possible measles exposure in 6 counties due to infected Amtrak rider KCRA
- Person with measles rode Amtrak trains and buses across CA, health officials say Sacramento Bee
- Unvaccinated passenger with measles traveled through Alameda County: CDPH KRON4
- California warns unvaccinated person with measles traveled through 6 counties CBS News
- Measles exposure warning issued after infected traveler passes through state The Mercury News