If you visited Grand Teton National Park in mid-to-late June, Wyoming public health officials have identified specific locations where you may have been exposed to measles.
The Wyoming Department of Health confirmed on June 29, 2026 that an unvaccinated adult in Teton County — who lives and works inside Grand Teton National Park — tested positive for measles. The case is Wyoming's second measles case of 2026 and the first in Teton County in at least 15 years.
