Key Takeaways
- California recorded 52 measles cases in the first 6½ months of 2026, more than double the total for all of 2025.
- 49 of the cases involved unvaccinated individuals or those with unknown vaccination status; four required hospitalization.
- Most cases affect children and youths: 27 cases ages 5‑19 and 15 cases under age 5.
- Los Angeles and Orange counties reported seven and four cases respectively, with several exposures tied to international travelers at LAX.
- Nationally, measles cases have already neared last year’s total (2,260 vs. 2,289) and could reach the highest level since the late‑1980s/early‑1990s outbreak.
- Infants under‑1‑year‑old cases linked to travel; health officials advise early MMR dosing for travelers and routine vaccination before the upcoming school year.
California has confirmed 52 measles cases in the first 6½ months of 2026, which is more than double the 25 cases reported for all of 2025. If the current pace continues, the state will see its highest annual count since 2015, when 125 cases were recorded, including those tied to the Disneyland outbreak. The surge highlights a worrying rebound of a disease once considered eliminated in the U.S.
Of the 52 cases, 49 patients were either unvaccinated or had an unknown vaccination record, and four individuals required hospitalization. The data underscore that lack of immunization remains the primary driver of transmission. Health officials stress that the MMR vaccine is safe, highly effective, and the best tool to prevent further spread.
Age distribution shows a heavy impact on children and young adults: 27 cases involved persons aged 5 to 19, and 15 cases were in children under five years old. These groups are especially vulnerable because they may have missed routine vaccinations or are too young to have completed the two‑dose series.
County‑level data reveal that Los Angeles County has logged seven cases among its residents, while Orange County has recorded four. Several of these infections are linked to travelers who passed through Los Angeles International Airport (LAX) while contagious, exposing others in terminals, baggage claim areas, and ground‑transport shuttles.
Nationally, measles activity is also climbing. As of mid‑July, 2,260 cases have been reported nationwide, compared with 2,289 for the entirety of 2025. Last year’s total was the highest since the devastating 1989‑91 epidemic, which produced over 55,000 cases and 166 suspected deaths. The CDC notes that 93 % of confirmed cases are associated with outbreaks, and 34 new outbreaks have been identified so far in 2026.
The most recent California case involved a juvenile who arrived on Delta Air Lines Flight 614 from Cancún, Mexico, on July 16 and was contagious while moving through LAX’s international terminal around Gate 206 and the baggage claim area between 10:30 p.m. and 11:30 p.m. Public‑health officials are contacting anyone who may have been exposed, advising symptom monitoring through August 6, given the 7‑ to 21‑day incubation window.
Two infants under one year of age have contracted measles in California this year; both had traveled internationally before falling ill. Since 2020, the state has logged 11 infant measles cases, eight of which involved international travel. Health officials recommend that infants aged 6‑11 months receive an early MMR dose if they will travel, followed by the standard two‑dose schedule later, and that children aged 1‑3 receive their second dose early when traveling abroad.
With the new school year only weeks away, officials urge parents to review their children’s immunization records and ensure up‑to‑date MMR vaccination. As Dr. Muntu Davis of L.A. County emphasized, measles spreads easily and can lead to pneumonia, encephalitis, or death, making vaccination the safest way to protect individuals, families, and the broader community. Proactive vaccination now can help curb the rising tide before it overwhelms healthcare resources.