San Bernardino County Reports First Measles Case Since 2023

Unvaccinated individual's visit to Ontario Walmart raises concerns about potential measles resurgence in California.

Published on Feb. 8, 2026

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San Bernardino County health officials have confirmed the first case of measles in the county since 2023, raising concerns about a potential resurgence of the highly contagious virus. The case involves an unvaccinated individual who visited the Walmart Supercenter in Ontario on January 29th, potentially exposing others.

Why it matters

This case is part of a broader trend, as measles infections are climbing across California and the nation. The increase is directly linked to declining vaccination rates, which allows the virus to spread more easily, particularly within communities with lower immunization levels.

The details

The unvaccinated individual visited the Walmart Supercenter in Ontario on January 29th, potentially exposing others to the highly contagious measles virus. Measles symptoms typically appear 7-14 days after exposure and include a high fever, cough, and red, watery eyes, followed by a characteristic red, blotchy rash. Individuals are contagious approximately four days before the rash appears and remain so for four days afterward.

  • The case was confirmed by San Bernardino County health officials on February 8, 2026.
  • The unvaccinated individual visited the Walmart Supercenter in Ontario on January 29, 2026.

The players

San Bernardino County Health Department

The local public health agency that confirmed the first measles case in the county since 2023.

Dr. Sharon Wang

The San Bernardino County Health Officer who stated that vaccines are the best defense against infectious diseases.

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What they’re saying

“Vaccines are our best defense against infectious diseases, protecting both individuals and the wider community.”

— Dr. Sharon Wang, San Bernardino County Health Officer

What’s next

Public health officials are actively working to address challenges such as vaccine hesitancy and declining herd immunity through education campaigns, outreach programs, and efforts to improve vaccine access.

The takeaway

This case underscores the importance of proactive public health measures and individual responsibility in protecting against preventable diseases. Continued vigilance and a commitment to vaccination are crucial to curbing the spread of measles and safeguarding community health.