Measles Exposures in Ontario
This page provides timely information about public locations visited by individuals with measles while they were infectious. For more information on measles, please see our Measles webpage
When a measles is case reported in Ontario, a public health investigation is completed to identify places where people may have been exposed to the measles virus.
Individuals who are not protected against measles AND who were in places where they may have been exposed to a case of measles on the following places and dates of possible exposure should check the website for their local public health unit for more information.
Vaccination remains the most effective way for individuals to provide protection against measles. For children and most adults born after 1970, this means receiving two doses of measles-containing vaccine (e.g., MMR vaccine). Individuals travelling within and outside of Canada should ensure they are adequately protected through vaccination prior to travelling.
The information on this webpage is updated regularly as new information becomes available. Please check your local public health unit website for updated information.
On this page:
Places and dates of exposure to a case of measles
Places visited by measles cases while infectious have been identified. Individuals who were in the following places during the dates and times specified should contact their local public health unit if they are not protected against measles. See the section What to do if you are exposed to measles to find out more.
These exposure sites have been compiled when new publicly disclosed exposure locations are identified. This list includes only exposure sites where public health was unable to identify and contact everyone who have been exposed.
Last updated: March 6, 2026
| Exposure Location | City/Town |
Exposure Dates and Times |
Monitor for Symptoms Until |
|---|---|---|---|
Metro |
Kingston |
February 13 between 4:45 PM to 7:00 PM |
March 6
|
Queens University- Kingston Hall |
Kingston |
February 10 between 11:30 AM to 2:30 PM |
March 3 |
Goodlife Fitness |
Kingston |
February 9 between 8:00 PM to 11:00 PM |
March 2 |
| Exposure Location | City/Town |
Exposure Dates and Times |
Monitor for Symptoms Until |
|---|---|---|---|
Toronto Pearson International Airport |
Mississauga |
February 22 between 1:40 PM to 4:10 PM |
March 16 |
Avianca, Flight AV 579 |
n/a |
February 22 |
March 16 |
Avianca, Flight AV324 |
n/a |
February 22 |
March 16 |
| Exposure Location |
City/Town |
Exposure Dates and Times |
Monitor for Symptoms Until |
|---|---|---|---|
Cortellucci Vaughan Hospital Emergency Department |
Vaughan |
February 28 between 3:00 PM to 6:10 PM |
March 21 |
York Region Transit |
n/a |
February 27 between 5:30 AM to 2:30 PM |
March 20 |
York Region Transit |
n/a |
February 26 between 6:00 AM to 5:00 PM February 25 between 6:00 AM to 5:00 PM February 23 between 6:00 AM to 5:00 PM |
March 19 March 18 March 17 |
York Region Transit |
n/a |
February 25 between 6:00 AM to 5:00 PM |
March 18 |
What to do if you are exposed to measles
If you are protected against measles, it is very unlikely that you will develop the disease. As a precautionary measure, watch for the onset of measles symptoms until 21 days after the date of exposure (see Places and dates of possible exposure to a case of measles) to find out more.
People are considered protected if they have at least one of the following:
- Proof of vaccination with two valid doses of measles-containing vaccine (e.g., MMR vaccine)
- Blood work showing antibodies to measles
- Documentation of prior laboratory-confirmed measles infection
- Are born before 1970 (with the exception of health care workers)
- All health care workers require evidence of vaccination with two valid doses of measles-containing vaccine or bloodwork suggestive of immunity (measles IgG reactive) regardless of year of birth
If you do not have any of the above, you are not protected against measles.
If you think you have been exposed and you are not protected against measles or if you are unsure about your immunization history:
- If you attend or work at a school, childcare, or healthcare setting, you MUST stay home and contact your local public health unit for further direction.
- If you have had no doses of MMR vaccine, stay at home and contact your local public health unit for further direction.
- If you have had one dose of MMR vaccine, call your healthcare provider or local public health unit to receive an additional dose of MMR vaccine. Notify your healthcare provider of your exposure so that they can take appropriate precautions to limit the spread of measles. Unless you work in a healthcare setting, you can immediately return to work, school, or daycare after you get a second dose of measles-containing vaccine.
- If you (or a family member) are at high risk of complications as listed below, contact your healthcare provider or local public health unit to discuss options to reduce the risk of measles infection through vaccination or a product called immunoglobulin. For these to be effective, they must be given very soon after exposure.
- Babies under one year age who have not received measles vaccine
- People with a severely weakened immune system
- Pregnant individuals who are not protected against measles
- If you are uncertain about your vaccination status, call your healthcare provider or your local public health unit to determine if you have received an MMR vaccine in the past.
- Watch for the onset of measles symptoms until 21 days after the date of exposure (see Places and dates of possible exposure to a case of measles).
- If you develop symptoms and need medical care, call ahead before you visit the doctor, clinic, or hospital to inform them of your exposure to measles so they can prepare for your arrival and take appropriate precautions.
- If you develop symptoms and do not need medical care, call your local public health unit.
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