The spread of measles around the world has been relentless over the past year. Over half the states in the U.S. reported increased measles cases in 2018. Airplane passengers also seem to be an unaware source of many new measles cases.
The most recent measles emergency comes from a California hospital that recently had to tell 200 patients they were exposed to the disease due to one infected child.
Earlier this month Sacramento, California hospital UC Davis Health announced that they sent several hundred letters notifying of possible measles exposure to patients who went to the emergency department on March 17th.