Public health officials in Riverside County have confirmed a case of measles in a child, marking the county’s first reported infection of 2026 and adding to a growing number of cases across Southern California.
The case was announced by Riverside University Health System – Public Health, which said the child is recovering at home. Officials noted the child was not vaccinated against measles and has no recent history of out-of-state or international travel.
Case Adds to Regional Measles Activity
Riverside County now joins Orange, Los Angeles, and San Bernardino counties, all of which have reported confirmed measles cases in recent weeks.
Health officials say the absence of travel history suggests local exposure, raising concerns about increased community transmission within Southern California.
“As we see growing reports of measles from our neighboring counties, the risk of measles is no longer remote,” said Riverside County Public Health Officer Dr. Jennifer Chevinsky. “It’s now also impacting us here in our own county, even among those with no recent international or out-of-state travel.”
Why Health Officials Are Urging Vaccination
Public Health emphasized that vaccination remains the most effective way to prevent measles, which is one of the most contagious viral illnesses.
The agency recommends:
- One dose of the Measles, Mumps and Rubella (MMR) vaccine at 12 months of age
- A second dose between ages 4 and 6
- An early dose for infants as young as 6 months if they are traveling internationally
“The importance of timely vaccination is clear,” Dr. Chevinsky said.
Symptoms and How Measles Spreads
Measles symptoms typically develop seven to 21 days after exposure. Early signs include:
- Fever
- Cough
- Runny nose
- Red or watery eyes
These symptoms are followed by a rash that usually begins on the face and spreads to the rest of the body.
According to public health officials, measles spreads through the air when an infected person coughs, sneezes, or even speaks. The virus can linger in the air and on surfaces, making it highly transmissible.
Protecting Vulnerable Populations
Public Health stressed the importance of early identification and staying home while sick, especially to protect those at higher risk of serious illness.
“This helps protect children under 6 months of age who are too young to be vaccinated, pregnant women who are at risk for severe disease, as well as those who have immunocompromising conditions,” the agency said.
Officials encouraged residents to contact a healthcare provider if they or their child develop symptoms consistent with measles, particularly if they are unvaccinated.
What Residents Should Know
While the case remains isolated, health officials say increased vigilance is critical as measles continues to appear in neighboring counties. Residents are encouraged to review vaccination records and speak with healthcare providers if they have questions or concerns.
Public Health has not released additional exposure locations at this time.
Featured image from: Chidiebere Ibe, CC BY-SA 4.0, via Wikimedia Commons