Health officials have confirmed measles cases across six California counties, with San Mateo County reporting its first case in February 2024. The infected individual had recently returned from international travel, according to county health authorities.
The California Department of Public Health reports eight confirmed measles cases as of March 11 across San Mateo, Fresno, Los Angeles, Orange, Placer, and Toulumne counties. This comes as nationwide measles cases have reached 378, exceeding last year's total, with outbreaks reported in twelve states.
Dr. Peter Chin-Hong, UCSF Infectious Diseases specialist, points to two key factors driving the spread: "There are a lot of measles around the world, so when people travel, they can bring it back to the U.S. There's also been an increase in the number of under-vaccinated and unvaccinated people."
Despite California maintaining a 95% measles vaccination rate - among the highest in the nation - health officials urge vigilance, particularly during spring break travel season. The highly contagious virus can spread through the air and remains transmissible up to four days before and after the appearance of a rash.
Common symptoms include:
- Cough
- Runny nose
- Pink eye
- Rash on face or along hairline
For unvaccinated individuals, measles can lead to serious complications including:
- Pneumonia
- Brain swelling
- Hospitalization
- Potential death
The California Department of Public Health strongly recommends measles vaccination for anyone planning international travel, particularly to regions where the disease remains prevalent, such as parts of Europe, Africa, and Asia.
While San Mateo County health officials state there is no ongoing public health risk from the February case, they advise residents to maintain current vaccination status and be aware of symptoms, especially when traveling.