Island County alerts Mukilteo-Clinton ferry passengers of measles exposure Dec. 30

Passengers who rode the Mukilteo-Clinton ferry between about 1 and 3 p.m. on Dec. 30 were potentially exposed to measles, Island County Public Health warned in an alert issued Jan. 20. The county relayed a Snohomish County report that a family infectious with measles traveled in the Puget Sound region during Dec. 27–Jan. 1, and identified the Mukilteo-Clinton ferry as a primary exposure site.

Island County Public Health advised anyone aboard that sailing to verify their MMR vaccination status, monitor for symptoms, and contact their health care provider and Island County Public Health for guidance. The county emphasized that measles is highly contagious and can linger in the air for up to two hours after an infected person leaves an area, increasing the risk to other riders and to people who use the ferry terminal facilities.

For island commuters, school families and workers who regularly use the Mukilteo-Clinton run, the alert underscores how quickly an infectious respiratory disease can reach Whidbey Island and Camano Island communities from mainland travel corridors. The ferry is a daily link for many residents and congregates people in enclosed spaces during peak travel, making timely vaccination status checks and public health communication especially important for this local route.

This exposure notice follows Snohomish County’s case confirmations and is part of routine communicable disease follow-up. Island County Public Health provided communicable disease contact information for residents seeking advice or reporting potential symptoms. The county asked people unsure of their immunity to consult their health care provider about MMR vaccination and to follow instructions from public health if they are identified as contacts.

Beyond individual precautions, the alert raises broader public health and equity concerns for Island County. Measles outbreaks disproportionately affect people who lack access to vaccines, those with incomplete vaccination records and people in households where infants are too young to be fully immunized. Ensuring vaccine access on the islands, clear outreach in multiple languages and targeted support for households with barriers to care are important components of preventing spread and protecting the most vulnerable residents.

Island County Public Health will continue to monitor and notify residents of any additional exposure locations. For now, anyone who rode the Mukilteo-Clinton ferry during the Dec. 30 1–3 p.m. window should confirm MMR status, stay alert for health notices, and contact their health care provider or Island County Public Health if they have concerns. The notice serves as a reminder that routine vaccinations and prompt public health reporting are key to keeping island communities safe and connected.