Airborne Virus Exposure Triggers Major Airport Alert

Public health officials are working to trace international travelers after a highly contagious airborne virus moved through a major North American transit hub.

The exposure alert centers on Toronto Pearson International Airport, where an unimmunized passenger arrived on an overseas flight while actively infectious with measles.

The November transit route created multiple exposure points, stretching from an overnight aircraft cabin into the busy customs, baggage, and arrival halls of Terminal 1.

Because the virus can remain infectious in the air for up to two hours after a carrier leaves the area, authorities have issued a strict 21-day symptom-monitoring period for anyone who passed through the facility or boarded the affected Ethiopian Airlines flight.

Nov. 3 Flight ET552 Joins Pearson Terminal 1 in Exposure Zones

Durham Region Health Department has identified three possible measles exposure locations connected to a confirmed case involving an unimmunized child who recently traveled internationally.

The November 7 announcement identifies Ethiopian Airlines Flight ET552, which traveled from Addis Ababa, Ethiopia, to Toronto Pearson International Airport. The flight departed on November 2 and arrived in Toronto the following morning, with a stop in Rome.

The other two exposure locations are Toronto Pearson’s Terminal 1 and the emergency department waiting room at Lakeridge Health Ajax-Pickering.

The health department has followed up directly with known contacts in Durham Region but says other members of the public may also have been exposed.

The affected locations and monitoring periods are:

• Ethiopian Airlines Flight ET552: November 2-3, from 11:32 p.m. East Africa Time on November 2 to 7:30 a.m. Eastern Standard Time on November 3.

• Toronto Pearson International Airport: Terminal 1, 6301 Silver Dart Drive, Mississauga, November 3, between 7:30 a.m. and 11 a.m. EST.

• Lakeridge Health Ajax-Pickering: Emergency department waiting room, 580 Harwood Avenue South, Ajax, November 3, between 10:40 a.m. and 5 p.m.

Anyone who was present at these locations during the specified periods is advised to monitor for measles symptoms through November 24, 2026.

The exposure locations and times are listed in the Durham Region Health Department’s official notice.

21-Day Incubation Window Triggers Nov. 24 Fever and Rash Watch

Measles is a highly contagious viral infection that spreads through the air and respiratory droplets.

The virus can remain infectious in the air or on surfaces for up to two hours after an infected person leaves an area.

According to the Durham Region Health Department, symptoms typically develop seven to 21 days after exposure.

They include:

• High fever of at least 38.3 degrees Celsius.

• Red, watery eyes and sensitivity to light.

• A red rash that can last four to seven days.

Infants under one year, pregnant people who are not immune, and individuals with weakened immune systems face an increased risk of complications.

The monitoring deadline of November 24 covers the full 21-day period identified by health officials following the November 3 exposures.

Durham Region Advises 2-Dose MMR Vaccine Checks for Passengers

Durham Region is advising people who may have been exposed to check their vaccination records and confirm that they have received two doses of a measles-containing vaccine, either MMR or MMRV.

People born before 1970 are considered likely to have immunity because measles circulated before routine vaccination became established. Those uncertain about their immunity should consult a healthcare provider.

Anyone who develops symptoms should stay home and avoid work or school. They should also telephone a healthcare provider before visiting a clinic or hospital, explain the possible exposure, and wear a well-fitting mask when seeking medical assessment.

For questions about the airport exposure, Ontario residents can contact their local public health unit or call Health811.

Additional guidance is available through Public Health Ontario’s measles exposure information.

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This story was originally published by TravelHost on Nov 10, 2026, where it first appeared in the News section. Add TravelHost as a Preferred Source by clicking here.