"The California Department of Public Health issued a health alert on Monday, warning residents of the ongoing transmission as cases emerge across multiple counties. Eight of those cases are part of a related outbreak in Shasta County, according to the department, making it the largest cluster identified so far. All individuals involved were either unvaccinated or had an unknown vaccination history. As of Feb. 9, confirmed cases have also been reported in Los Angeles, Orange, San Bernardino and Riverside counties."
"Measles spreads through the air and can remain infectious for hours after an infected person leaves a room. Roughly 90% of unvaccinated people exposed to the virus will become infected, according to the CDPH. Symptoms of measles include a high fever, cough, runny nose, red eyes and a spreading rash. Severe complications can include pneumonia and encephalitis, particularly in young children and unvaccinated individuals."
Seventeen measles cases have been reported across California since the start of 2026, prompting a state health alert. Eight cases form a related Shasta County cluster; all involved were unvaccinated or had unknown vaccination status. Confirmed cases have also appeared in Los Angeles, Orange, San Bernardino and Riverside counties, with additional suspected cases under investigation. Two infectious cases visited Disneyland on Jan. 22 and Jan. 28, triggering exposure notifications for employees and visitors. Measles transmits through the air, can remain infectious for hours, and infects roughly 90% of unvaccinated people exposed. Symptoms include high fever, cough, runny nose, red eyes and a spreading rash, with risks of pneumonia and encephalitis.
Read at SFGATE
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