Health officials said an adult measles case in Teton County may have exposed people at locations in Grand Teton National Park and Jackson during peak summer travel.
By yourNEWS Media Newsroom
Wyoming health officials are warning residents and travelers to monitor for measles symptoms after confirming an adult case in Teton County and identifying possible exposure locations in Grand Teton National Park and Jackson.
The Wyoming Department of Health said the potential exposures occurred between June 17 and June 25, including at restaurants in Colter Bay Village on June 17 and 18, the Colter Bay convenience store on June 20 and the Target store in Jackson on June 25, WyoFile.com reported.
Officials said the notice is meant to help identify people who may have been exposed. It does not indicate that an outbreak has been declared.
The alert comes during the region’s busy summer tourism season, when large numbers of visitors travel through Jackson and Grand Teton National Park.
“We are asking people who may have been exposed to watch for measles symptoms for 21 days past the exposure date and consider avoiding crowded public places and high-risk settings such as daycare centers,” Wyoming State Health Officer Dr. Alexia Harrist said.
State health officials especially urged people who have not received the measles, mumps and rubella vaccine to monitor closely for symptoms.
The Teton County infection is Wyoming’s second confirmed measles case of 2026. The first case this year was confirmed in May and involved an adult whose vaccination status could not be verified.
Wyoming had gone 15 years without a confirmed measles case before infections were reported again in 2025. The state recorded 14 measles cases last year, most of them involving unvaccinated children and adults.
Measles spreads easily and can cause serious complications, including pneumonia and brain swelling.
The Centers for Disease Control and Prevention recommends a 95% vaccination rate to maintain community immunity against measles. CDC data cited by WyoFile showed that 93.6% of Wyoming kindergarten students had completed the MMR vaccination series in 2025.
That rate was higher than those in neighboring Colorado, Utah and Montana but remained below Wyoming’s vaccination levels from more than a decade earlier.
Nationally, measles activity has continued to rise. According to the CDC, the United States has recorded 30 new measles outbreaks in 2026. The agency said 93% of the nation’s 2,134 confirmed cases have been linked to outbreaks, including 629 cases tied to outbreaks that began this year and 1,353 associated with outbreaks that started in 2025.
Wyoming officials said people who may have been at the listed exposure sites should watch for symptoms for 21 days and take precautions around crowded places or high-risk settings if they may have been exposed.
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