More than a dozen states have reported measles cases to the Centers for Disease Control and Prevention in what public health officials are calling the largest outbreak in recent history.
One of those states is California, which has 40 confirmed measles cases, according to the California Department of Public Health. While much lower than the case count in 2015 — a year after the start of an outbreak at Disneyland — the figure dwarfs the numbers reported in recent years.
The CDC, in a report published this week, said unvaccinated U.S. residents traveling internationally are at a high risk of spreading the disease. The cases that could be tracked to a source country were traced to the Philippines, Ukraine, Israel, Thailand, Germany and Vietnam.
Many of the cases in the state have been concentrated in Northern California with outbreaks reported in Sacramento, Placer, San Mateo, Los Angeles and Santa Clara counties. The largest number — 16 — is shared between Butte, Calaveras, Shasta and Tehama counties.