Measles Alert: Confirmed Case in Park County, Wyoming

What You Need to Know (2026)

Apr. 11, 2026 at 8:28am

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An extreme close-up X-ray photograph revealing the intricate internal structure of a measles virus particle, appearing as a glowing, translucent outline against a dark background, conceptually illustrating the public health concerns around breakthrough infections.A rare breakthrough measles case in a vaccinated individual serves as a reminder of the importance of maintaining high vaccination rates in the community.Cody Today

A measles case has been identified in Park County, Wyoming, and this is a stark reminder that even vaccinated individuals can be at risk. The Wyoming Department of Health has confirmed a measles infection in a vaccinated adult who had traveled abroad and encountered a high-risk environment for measles exposure.

Why it matters

This rare occurrence raises questions about the effectiveness of the MMR vaccine, as the majority of measles cases this year have been in unvaccinated individuals. It's a reminder that even with high vaccination rates, measles outbreaks can still happen and that public health vigilance is crucial.

The details

The WDH is taking swift action to notify anyone who may have been exposed to the virus in Park County. Measles is highly contagious and can linger in the air for up to two hours after an infected person has left the vicinity. The public may have been exposed at Albertsons, Cody, WY on December 15 and 17, and Walmart, Cody, WY on December 18.

  • The measles case was confirmed on April 11, 2026.
  • The potential exposure locations were Albertsons in Cody, WY on December 15 and 17, 2025, and Walmart in Cody, WY on December 18, 2025.

The players

Wyoming Department of Health (WDH)

The state health department that confirmed the measles case and is taking action to notify the public.

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What’s next

The WDH urges all Wyoming residents to ensure their MMR vaccinations are up to date, especially for children. MMR vaccines are readily available across Wyoming through various healthcare providers.

The takeaway

This case highlights the importance of maintaining high vaccination rates, even though breakthrough infections can still occur. It also underscores the need for continued public health vigilance and education around the risks and prevention of measles.