Wyoming confirms Measles Case in Vaccinated Park County Resident
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A confirmed case of measles has been identified in a Park County resident, prompting a public health alert from the Wyoming Department of Health (WDH). the case underscores the continued threat of this highly contagious disease, even among individuals who are fully vaccinated.
The WDH confirmed the diagnosis in a recent news release, noting the adult patient had received all recommended doses of the measles, mumps, and rubella (MMR) vaccine. however, the individual experienced significant exposure to the virus while traveling internationally and afterward developed a mild illness.Fortunately, the patient did not require hospitalization.
Public Exposure Sites Identified
health officials are actively working to identify and notify individuals who may have been exposed to the virus in Park County. the WDH has pinpointed the following locations and times as potential exposure points:
- Albertsons, 1825 17th St., Cody, WY 82414
- December 15, 2025, 1:30 to 4 p.m.
- december 17, 2025, 2:30 to 5 p.m.
- Walmart, 321 yellowstone Ave., Cody, WY 82414
- December 18, 2025, 2:30 to 5 p.m.
Officials emphasize that the measles virus can remain infectious in the air for up to two hours after an infected person has left the area, increasing the potential for transmission.
vaccination Remains Key Defence
While breakthrough infections – cases occurring in vaccinated individuals – are possible, data indicates the MMR vaccine provides robust protection. “While it is rare for immunized individuals to develop measles infection,it can occur and typically results in milder illness compared to unvaccinated individuals,” a senior official stated.
Nationwide, the impact of vaccination is clear. As of December 2025, of the 1,958 measles cases reported in the U.S., 93% occured in unvaccinated individuals, 3% had received one dose of the MMR vaccine, and only 4% had received two doses.
Why did this happen? The measles case in Park county stemmed from international travel exposure, despite the resident being fully vaccinated. The virus is highly contagious, and even full vaccination doesn’t guarantee complete protection, though it significantly reduces severity.
who is affected? The primary individual affected is the Park County resident who contracted measles.However, the WDH is working to identify and notify anyone potentially exposed at Albertsons and Walmart in Cody between December 15-18, 2025.
What is the WDH doing? The wyoming Department of Health is actively investigating the case, identifying exposure sites, and notifying potentially exposed individuals. They are also reinforcing the importance of MMR vaccination for all residents.
How did it end? The case is currently contained to a single individual who did not require hospitalization and is recovering. The WDH continues to monitor for any further cases and is focused on preventing further spread through vaccination and public awareness.
Measles is a serious illness that can lead to severe complications, including pneumonia, encephalitis, hospitalization, and even death. The WDH strongly recommends that all Wyoming residents, and their children, ensure their MMR vaccinations are current
