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​Measles is a highly contagious viral disease. It is widespread in many parts of the world, including Europe, Africa, and Asia. Measles begins with a fever that lasts for a couple of days, followed by a cough, runny nose, conjunctivitis (pink eye), and a rash. The rash typically appears first on the face, along the hairline, and behind the ears and then affects the rest of the body. Infected people are usually contagious from about 4 days before their rash starts to 4 days afterwards.

The last large outbreak of measles in California was associated with Disneyland and occurred from December 2014-April 2015, when at least 131 California residents were infected with measles; the outbreak also infected residents of six other states, Mexico, and Canada.

In 2019, one outbreak of three cases linked to a patient with international travel has been reported in California. As of March 7, 2019, six confirmed measles cases, including the three outbreak-associated cases, have been reported in the following jurisdictions.

Total Reported Measles Cases in California, 2019

CountyTotal CasesPediatric Cases (<18 Years)Adult Cases (18 Years or Older)
​Los Angeles​1​1​0
​San Francisco​1​0​1
​San Mateo​2​1​1
​Santa Clara​1​1​0
​Santa Cruz​1​0​1

Case counts for 2012-2017 are available in the Vaccine-Preventable Disease Summaries.  As of March 7, 2019, 21 confirmed measles cases were reported in California in 2018; these data are provisional and subject to change.

For information on measles cases and outbreaks nationwide, please see the CDC Measles Cases and Outbreaks.


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