Idaho Health Officials Warn of Possible Measles Exposure at Boise Airport in Late March
The Idaho Department of Health and Welfare (IDHW) is alerting the public to a potential measles exposure at Boise Airport after an infected traveler passed through the facility on March 29, 2026. Idaho residents and visitors who were at the airport between 1:30 p.m. and 7:40 p.m. that day may have been exposed to the highly contagious airborne virus, health officials said.
Background: Measles Exposure at Boise Airport
According to IDHW, an individual traveling with a confirmed measles infection may have exposed members of the public at Boise Airport during a roughly six-hour window on March 29. Boise Airport officials have been notified, and the agency said efforts have already been made to contact Idaho travelers who shared flights with the infected person.
Measles is an airborne virus that spreads through coughing, sneezing, and speaking. IDHW noted that unvaccinated individuals can contract the virus up to two hours after an infected person has left an area — a fact that underscores how easily the disease can spread in high-traffic public spaces like airports.
“People who may have been exposed should be aware of symptoms that may develop,” IDHW said in a public statement.
This exposure comes as health officials across the country are tracking measles outbreaks in multiple U.S. regions and internationally. IDHW confirmed that countries around the world are currently experiencing measles outbreaks, and that the risk for travel-related measles exposure remains ongoing for Idahoans who fly domestically or internationally.
Symptoms, Risks, and What Ada County Families Should Know
Health officials say the initial symptoms of measles include a rash, fever, runny nose, cough, and red or watery eyes. In serious cases, a measles infection can progress to pneumonia, brain infection, or death, according to IDHW.
The agency emphasized the effectiveness of the MMR (measles, mumps, and rubella) vaccine in preventing the disease. The standard vaccination schedule calls for the first dose between 12 and 25 months of age, followed by a second dose between ages 4 and 6. Infants under 12 months are typically unprotected from measles, though IDHW noted that doctors may recommend an early MMR dose for babies traveling internationally.
For Ada County families with travel plans — whether heading to another part of the U.S. or traveling abroad — IDHW is urging parents to consult with a healthcare provider at least two weeks before departure. Families with infants traveling to outbreak areas are especially encouraged to seek that guidance early.
“The risk of travel-related measles exposure is ongoing,” the agency stated.
Impact on Ada County Residents and Travelers
Boise Airport serves as the primary commercial air hub for Ada County and the broader Treasure Valley, processing thousands of passengers daily. The March 29 exposure window covered a substantial portion of the afternoon travel period, meaning a significant number of Idaho residents, business travelers, and tourists could potentially have been in the affected areas.
IDHW has not specified how many individuals were directly contacted regarding potential exposure, but said efforts have been made to reach those who traveled on the same flights as the infected person. Residents who were at Boise Airport on March 29 between 1:30 p.m. and 7:40 p.m. and have not been contacted should monitor themselves for symptoms and reach out to a healthcare provider if any develop.
As Boise continues to grow as a regional transportation hub — with ongoing infrastructure upgrades across the Treasure Valley, including improvements to downtown Boise’s 8th Street Corridor and major road projects like the I-84 Connector construction in Ada County — public health preparedness at major transit points remains an important community concern.
What Comes Next: Resources and How to Protect Your Family
IDHW is directing Ada County residents to the following resources for up-to-date information:
Measles information: Visit cdc.gov/measles/about/index for general information about measles symptoms, transmission, and prevention.
International travel health notices: The Centers for Disease Control and Prevention posts current travel health advisories at wwwnc.cdc.gov/travel/notices.
Residents who believe they may have been exposed should contact their primary care physician or local health clinic before visiting an emergency room or urgent care facility in order to prevent potential spread in waiting areas. Anyone experiencing symptoms consistent with measles — particularly rash combined with fever, cough, or red eyes — should call ahead before seeking in-person care.
IDHW encouraged all eligible Idahoans who are unvaccinated or unsure of their vaccination status to speak with a healthcare provider about receiving the MMR vaccine as the broader national measles situation continues to develop.