Toronto health officials warn of measles exposure at Pearson Airport

Toronto Public Health issued a warning Friday about a measles exposure at Pearson Airport, marking the second such alert at the facility in two weeks. A traveler who had recently been abroad carried the virus through Terminal 1 on December 8, potentially exposing anyone in the terminal between 10 a.m. and 1:30 p.m., as well as all passengers aboard Emirates Airlines Flight EK241 from Dubai that arrived that day.

The health authority is asking anyone who may have been in those locations or on that flight to watch for symptoms through December 29. Measles announces itself through fever, a runny nose, cough, and red eyes. The telltale rash starts on the face and spreads downward across the body. Small blue-white spots can appear inside the mouth and throat. Public health officials emphasized that even vaccinated people should remain vigilant—the vaccine is highly effective, but breakthrough infections are possible.

This is not an isolated incident. Just two weeks earlier, Peel Public Health had identified another measles case involving someone who flew from Kabul to Toronto on December 4, transiting through Istanbul. That traveler also moved through Terminal 1. The back-to-back exposures at Canada's busiest airport underscore how quickly infectious disease can move through a major transportation hub.

The numbers tell a concerning story. Ontario is tracking 63 measles cases as of mid-December. Two-thirds of them are children and adolescents—the population least likely to have immunity if they were born after routine vaccination programs reached full coverage. In Toronto alone, nine cases have been reported this year. Across Canada, the picture is grimmer: 138 cases have been confirmed as of late November, compared to just 12 cases in all of 2023. The country is experiencing a measles resurgence that public health officials attribute to increased international travel and pockets of lower vaccination coverage.

Measles is a highly contagious viral infection. A single infected person can transmit it to nine out of ten unvaccinated people in close contact. The virus spreads through respiratory droplets—coughs, sneezes, or even breathing the same air in an enclosed space like an airplane cabin or airport terminal. Once someone is infected, there is no specific treatment; management focuses on managing symptoms and preventing complications, which can include pneumonia, encephalitis, and in rare cases, death.

Public health authorities are urging anyone who develops symptoms to contact a health care provider immediately rather than visiting a clinic or hospital without warning, which could expose others. The agency also recommends that people confirm their vaccination status. Two doses of the measles-mumps-rubella vaccine provide lifelong immunity in the vast majority of cases. For those unsure of their status or unvaccinated, vaccination remains available and is the most reliable protection against infection.

The recurring exposures at Pearson reflect a broader reality: measles never truly disappeared from the world, and international travel means it can arrive in Toronto on any flight. As cases continue to climb and the holiday season brings increased air travel, public health officials are watching closely to see whether these airport exposures spark secondary transmission in the community.