Hawaii on High Alert: Measles Resurgence and What it Means for Travelers
Hawaii is facing a renewed threat from measles, a highly contagious viral disease, as cases surge across the U.S. Mainland. The recent confirmation of a measles case in an adult visitor to Oahu serves as a stark reminder that the islands are not immune to outbreaks, particularly given Hawaii’s role as a major travel hub.
The Rising Tide of Measles in the US
As of March 12, 2026, the Centers for Disease Control and Prevention (CDC) has reported 1,362 confirmed measles cases nationwide in 2026, spanning 31 jurisdictions. This represents a significant increase compared to 2025, which saw a total of 2,284 confirmed cases. South Carolina is currently experiencing the most severe outbreak, with 993 cases reported as of March 10.
The CDC data also reveals that 94% of confirmed cases are linked to ongoing outbreaks, with 14 new outbreaks reported in 2026 alone. Nine cases have been identified among international visitors to the United States.
Hawaii’s Vulnerability: A Travel Hub at Risk
State Epidemiologist Dr. Sarah Kemble emphasizes Hawaii’s unique vulnerability. “We are a major international travel hub and a major destination from the U.S. Mainland too,” she stated. “So We see important to remember that measles is just a plane ride away. It may come knocking at our door at any point in time.”
Recent exposure locations on Oahu and the Big Island include Daniel K. Inouye International Airport, the Laie Mormon Temple, Hilo International Airport, a Thai restaurant in Hilo, and Hawai‘i Volcanoes National Park. Individuals who visited these locations during the specified dates in late February and early March are urged to monitor for symptoms.
Understanding Measles: Symptoms and Transmission
Measles symptoms typically appear 7-14 days after exposure, but can take up to 21 days. Initial symptoms include a high fever, cough, runny nose, and red, watery eyes, followed by a characteristic rash that spreads from the face downwards. The virus can remain infectious in the air for up to two hours after an infected person has left a room.
Measles is highly contagious; nine out of ten people who are exposed and lack immunity will become infected.
Vaccination Rates and the Threat to Herd Immunity
While two doses of the measles, mumps, and rubella (MMR) vaccine are 97% effective, Hawaii’s child immunization rates have been declining. The latest CDC data shows Hawaii’s kindergartener vaccination rate for MMR at 89.9% for the 2024-25 school year, below the national average and the crucial 95% threshold needed for herd immunity.
This decline began before the COVID-19 pandemic and predates recent changes to vaccine schedules. Health officials continue to emphasize vaccination as the most effective way to prevent measles.
Wastewater Surveillance: An Early Warning System
The Hawaii Department of Health (DOH) is utilizing wastewater surveillance as an early warning system. Measles virus has been detected in wastewater samples from West Hawaii County (August 2025), Kauai (October 2025), and West Maui County (November and December 2025). While no confirmed human cases followed these detections, the surveillance provides valuable insight into potential community spread.
What to Do If You Suspect Measles
If you develop symptoms of measles, isolate yourself at home and contact your healthcare provider and the Hawaii DOH immediately. The DOH Disease Reporting Line is 808-586-4586. The Disease Investigation Branch can be reached at 808-586-8362.
FAQ: Measles in Hawaii
Q: How contagious is measles?
A: Measles is extremely contagious. Nine out of ten people who are exposed and don’t have immunity will become infected.
Q: What are the potential complications of measles?
A: Complications can include pneumonia, brain swelling (encephalitis), and even death.
Q: Is the MMR vaccine safe?
A: Yes, the MMR vaccine is safe and highly effective. Two doses provide 97% protection against measles.
Q: What should I do if I think I’ve been exposed?
A: Contact your doctor immediately and inform them of your potential exposure.
Q: Can vaccinated individuals still get measles?
A: While rare, breakthrough cases can occur, but they are typically mild.
Did you realize? Measles can remain infectious in the air for up to two hours after an infected person has left the room.
Pro Tip: Before traveling, check your immunization records and ensure you are up-to-date on your MMR vaccinations.
Stay informed about the latest measles updates and recommendations from the Hawaii Department of Health and the CDC. Protect yourself and our community by prioritizing vaccination and vigilance.
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