Stay alert for symptoms even if vaccinated against measles.
For the third time in recent months, an international flight has carried measles into Pearson Airport, this time aboard a Turkish Airlines arrival from Istanbul on a Wednesday evening in late January. Toronto Public Health has issued a warning to fellow passengers, asking them to watch for symptoms through mid-February — a quiet but urgent reminder that diseases once thought distant have a way of travelling with us. Ontario's 65 recorded cases across 2024 and 2025 suggest this is not an isolated moment, but part of a slow, ongoing return of a virus that a generation of Canadians has never had reason to fear.
- A confirmed measles case aboard Turkish Airlines Flight TK17 has potentially exposed an entire planeload of passengers arriving from Istanbul at one of Canada's busiest airports.
- Measles is among the most contagious diseases known — one infected person can spread it to up to 18 others — and the virus can survive in the air or on surfaces for two full hours after an infected person has left the room.
- This is the third measles exposure warning at Pearson in recent months, pointing to a troubling pattern of the disease entering Canada through international air travel.
- Ontario has logged 65 measles cases in 2024–2025, and Canada has already seen eight cases in the early weeks of 2025, signalling that the threat is neither isolated nor fading.
- Exposed passengers — vaccinated or not — are being asked to monitor themselves for fever, rash, cough, and red eyes until February 12, and to contact a healthcare provider immediately if any symptoms emerge.
Toronto Public Health issued a warning Friday about a measles exposure at Pearson Airport Terminal 1, asking travellers on Turkish Airlines Flight TK17 — which arrived from Istanbul at 5:30 p.m. Wednesday — to monitor themselves for symptoms through February 12. A passenger on the flight was later confirmed to have measles after recently travelling abroad.
Measles follows a recognizable pattern: fever, runny nose, cough, and red eyes arrive first, followed by a rash that begins on the face and spreads downward. Small blue-white spots inside the mouth can also appear. Public health officials stressed that even vaccinated individuals should stay alert and contact a healthcare provider immediately if symptoms develop.
The concern is amplified by the nature of the disease itself. Measles spreads through the air when an infected person coughs, sneezes, or speaks, and can remain viable in the air or on surfaces for up to two hours — making a busy, enclosed airport a particularly effective transmission environment. This marks the third such exposure warning at Pearson in recent months.
The broader numbers underscore the seriousness. Ontario has recorded 65 measles cases across 2024 and 2025, Canada reported 147 cases last year, and eight have already emerged in 2025. For a generation of Canadians who have never encountered the disease, the message from public health is straightforward: take the warning seriously, watch for symptoms, and seek care without delay.
Toronto Public Health issued a warning Friday about a measles exposure at Pearson Airport Terminal 1 this week, asking travellers who arrived on a specific flight to watch themselves for symptoms over the next three weeks.
The exposure occurred on Turkish Airlines Flight TK17, which departed Istanbul and touched down at the airport at 5:30 p.m. on Wednesday. The airline carried a passenger who had recently travelled abroad and was later confirmed to have measles. Anyone aboard that flight is now being asked to monitor for illness through February 12.
Measles announces itself through a familiar sequence: fever, a runny nose, cough, and red eyes come first. Then comes the rash—red spots that start on the face and travel downward across the body. The disease can also produce small blue-white spots inside the mouth and throat. Toronto Public Health emphasized that people should stay alert for these signs even if they have been vaccinated against measles, and to contact a healthcare provider immediately if symptoms appear.
The virus spreads through the air when an infected person coughs, sneezes, or speaks. It can linger in the air or settle on surfaces for up to two hours, making airports—crowded, enclosed spaces where people move through quickly—particularly vulnerable transmission points. This is the third measles exposure warning at Pearson in recent months, suggesting a pattern of international travellers arriving with the disease.
The numbers tell a broader story. Ontario has recorded 65 measles cases across 2024 and 2025. Canada reported 147 cases last year, and eight cases have already emerged in 2025. These figures reflect a disease that most Canadians under 50 have never encountered in their lifetime, making awareness and quick action critical when cases do appear.
Public health officials are urging anyone who was on that flight to take the warning seriously. Measles is highly contagious—far more transmissible than most respiratory illnesses. A single infected person can spread it to 12 to 18 others in an unvaccinated population. Even vaccinated individuals can contract the disease, though vaccination significantly reduces the risk of severe illness. The message from Toronto Public Health is clear: watch for symptoms, and if they develop, seek care without delay.
Citas Notables
Stay alert for symptoms even if vaccinated against measles. If symptoms develop, contact a health care provider immediately.— Toronto Public Health
La Conversación del Hearth Otra perspectiva de la historia
Why does a single flight exposure warrant a public warning? Aren't airports full of sick people all the time?
Measles isn't like a cold. It's one of the most contagious diseases we know—it can infect people who weren't even in the same row as the sick person. It lingers in the air for hours. That's why a single case on a plane matters.
But people are vaccinated. Shouldn't that be enough?
Most people are, yes. But vaccination isn't a perfect shield. And there are always some people who can't be vaccinated—infants, people with certain immune conditions. Those are the ones at real risk if they were on that flight.
This is the third warning at Pearson in recent months. Is that unusual?
It suggests measles is circulating internationally more than it has been. These are travellers coming back from places where measles is still active. Each one is a reminder that diseases don't respect borders.
What happens if someone develops symptoms?
They need to call ahead before going to a clinic or hospital—so staff can prepare and isolate them. If measles spreads in a healthcare setting, it can infect vulnerable patients. That's why the immediate call is so important.
How long do people need to worry?
Until mid-February. That's the window where symptoms would show up if exposure happened. After that, if nothing has appeared, they're clear.