
Measles Exposures in Ontario
Ongoing measles transmission in Ontario is impacting multiple public health units. Detailed information on measles cases in Ontario can be found in the Measles in Ontario Enhanced Epidemiological Summary.
For each measles 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.
Getting vaccinated is the best way to protect yourself against measles.
The information on this webpage is updated on Tuesdays and Fridays. Please check your local public health unit website for updated information.
On this page:
- Places and dates of exposure to a case of measles
- What is measles?
- What to do if you are exposed to measles
Places and dates of exposure to a case of measles
Places visited by recent 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 from public advisories issued by public health units and will be updated regularly, as the information may change as new cases are identified and current exposures become out of date. Please note: this list includes only known exposure sites and there may be sites that have not yet been identified.
Last updated on March 21, 2025
Exposure Location |
City/Town |
Exposure Dates and Times |
Monitor for Symptoms Until |
---|---|---|---|
McDonald’s Restaurant |
Chatham |
March 13 between 7:30 PM and 10:00 PM March 11 between 7:30 PM and 10:00 PM March 10 between 7:30 PM and 10:00 PM |
April 3 April 1 March 31 |
Chatham-Kent Health Alliance |
Chatham |
March 13 between 6:25 PM and 8:30 PM |
April 3 |
Chatham-Kent Health Alliance Wallaceburg Site |
Wallaceburg |
March 11 between 7:30 PM and 11:30 PM |
April 1 |
Walmart |
Chatham |
March 10 between 10:00 AM and 1:30 PM March 7 between 11:15 AM and 2:30 PM |
March 31 March 28 |
YMCA Chatham |
Chatham |
March 10 between 8:55 AM and 5:30 PM March 6 between 12:45 PM and 4:05 PM February 25 between 1:00 PM and 4:30 PM |
March 31 March 27 March 18 |
Emmanuel Baptist Church |
Chatham |
March 9 between 9:30 AM and 1:30 PM |
March 30 |
Gregory Drive Alliance Church |
Chatham |
March 9 between 9:00 AM and 2:00 PM |
March 30 |
John D. Bradley Centre |
Chatham |
March 8 between 1:00 PM and 4:30 PM |
March 29 |
Country Kitchen |
Chatham |
March 7 between 9:30 AM and 1:15 PM |
March 28 |
Growing Together Family Resource Centre – W.J. Baird Site |
Blenheim |
March 4, 5, 6, 7 between 7:45 AM and 10:00 AM |
March 28 |
Tim Horton's Park Avenue |
Chatham |
March 6 between 4:45 PM and 7:15 PM |
March 27 |
EarlyON - W.J. Baird Site |
Blenheim |
March 4 and March 6 between 7:45 AM and 10:00 AM |
March 27 |
Thamesview Family Health Team |
Chatham |
March 6 between 2:15 PM and 4:45 PM March 5 between 11 AM and 1:30 PM |
March 27 March 26 |
Tilbury Walk-In Clinic |
Tilbury |
March 6 between 9:30 AM and 12:30 PM March 5 between 2 PM and 6 PM |
March 27 March 26 |
Blenhim Golden Eagles Gymnastics Club |
Blenheim |
March 6 between 6:30 PM and 9:40 PM |
March 27 |
Angela Merici Catholic School |
Chatham |
March 6 between 5:15 PM and 9:15 PM |
March 27 |
Chatham Christian School |
Chatham |
March 4-6 between 3:30 PM and 5:30 PM |
March 27 |
No Frills Chatham |
Chatham |
March 5 between 10:00 AM and 2:00 PM |
March 26 |
Ebenezer Christian School |
Chatham |
March 4 between 7:30 PM and 11:30 PM |
March 25 |
Municipality of Chatham-Kent Tilbury Municipal Office |
Tillbury |
March 3 between 9:30 AM and 12:10 PM |
March 26 |
ONroute Tilbury - 401 Westbound |
Tilbury |
March 1 between 5:00 PM and 8:00 PM |
March 22 |
Chatham Christian School |
Chatham |
February 28 between 8:30 AM and 5:00 PM |
March 21 |
Chatham Christian School |
Chatham |
February 27 between 6:00 PM and 10:30 PM |
March 20 |
Exposure Location |
City/Town |
Exposure Dates and Times |
Monitor for Symptoms Until |
---|---|---|---|
McMaster Children's Hospital |
Hamilton |
March 6 between 7:53 PM and 8:53 PM |
March 27 |
Stoney Creek Medical Walk-in Clinic |
Hamilton |
March 6 between 6:40PM and 9:00 PM |
March 27 |
Hamilton Medical Centre and Walk-in Clinic |
Hamilton |
March 5 between 9:15 AM and 12:00 PM |
March 26 |
Costco – Stoney Creek |
Stoney Creek |
March 5 between 3:30 PM and 7:30 PM |
March 26 |
Exposure Location |
City/Town |
Exposure Dates and Times |
Monitor for Symptoms Until |
---|---|---|---|
Stratford General Hospital |
Stratford |
March 9 between 11:30 AM and 2:00 PM |
March 30 |
Exposure Location |
City/Town |
Exposure Dates and Times |
Monitor for Symptoms Until |
---|---|---|---|
Norfolk General Hospital |
Simcoe |
March 11 between 2:00 PM and 5:00 PM March 9 between 3:30 PM and 6:00 PM February 26 between 6:15 AM and 8:30 PM
|
April 1 March 30 March 19
|
Delhi Community Health Centre Walk-in Clinic |
Delhi |
March 7 between 10:00 AM and 2:00 PM March 6 between 5:00 PM and 10:00 PM
|
March 28 March 27
|
Glen Meyer Old Colony School |
Langton |
March 3, 4 and 5 between 8:45 AM and 5:00 PM |
March 26 |
Family Practice Office, Roulston's Pharmacy |
Simcoe |
March 4 between 1:00 PM and 5:30 PM |
March 25 |
Valley Heights SS |
Langton |
February 25 between 6:00 PM and 9:30 PM |
March 18 |
Dover Dental |
Port Dover |
February 21 between 1:00 PM and 4:00 PM |
March 14 |
Exposure Location |
City/Town |
Exposure Dates and Times |
Monitor for Symptoms Until |
---|---|---|---|
Value Village |
London |
March 1 between 10:45 AM and 3:00 PM |
March 22 |
Victoria Hospital |
London |
February 28 between 10:43 PM |
March 22 |
Niagara Region Public Health Unit
Exposure Location |
City/Town |
Exposure Dates and Times |
Monitor for Symptoms Until |
---|---|---|---|
MedCare Clinic 387 Scott St, Unit A2C |
St. Catharines |
March 2 between 4:20 PM and 6:20 PM |
March 23 |
Exposure Location |
City/Town |
Exposure Dates and Times |
Monitor for Symptoms Until |
---|---|---|---|
Credit Valley Hospital Emergency Room |
Mississauga |
March 11 between 10:30 AM and 9:55 PM |
April 2 |
Aboud Health Group |
Mississauga |
March 10 between 4:30 PM and 7:30 PM February 27 between 3:15 PM and 7:00 PM |
April 1 March 20 |
Multi-Specialty Med Clinic |
Mississauga |
Between March 8 at 7:03 PM to 1:00 AM on March 9 |
March 30 |
Hazel McCallion Central Library |
Mississauga |
March 7 between 11:00 AM and 6:00 PM |
March 28 |
Toronto Pearson International Airport, Terminal 1 |
Mississauga |
March 2 between 4:50 PM and 7:40 PM February 24 between 8:36 AM and 12 PM February 22 between 9:35 AM and 1 PM |
March 23 March 17 March 15 |
Trillium Health Partners Credit Valley Hospital |
Mississauga |
Between February 27 at 8:45 PM |
March 21 |
Air Canada |
N/A |
February 24 |
March 17 |
Simcoe Muskoka District Health Unit
Exposure Location |
City/Town |
Exposure Dates and Times |
Monitor for Symptoms Until |
---|---|---|---|
Huronia Urgent Care Clinic |
Barrie |
March 12 between 10:55 AM to 2:00 PM |
April 2 |
Georgian Radiology at Huronia Urgent Care Clinic |
Barrie |
March 12 between 10:55 AM to 2:00 PM |
April 2 |
Eagle Ridge Pharmacy |
Barrie |
March 12 between 10:55 AM to 2:00 PM |
April 2 |
Exposure Location |
City/Town |
Exposure Dates and Times |
Monitor for Symptoms Until |
---|---|---|---|
Central Hastings Family Team |
Madoc |
February 27 between 11:11 AM and 1:16 PM |
March 20 |
Southwestern Public Health Unit
Exposure Location |
City/Town |
Exposure Dates and Times |
Monitor for Symptoms Until |
---|---|---|---|
Woodstock Hospital |
Woodstock |
March 14 between 12:15 PM and 2:30 PM March 12 between 6:57 PM and 9:04 PM March 11 between 7:09 AM and 9:30 AM March 5 between 1:43 PM and 5:16 PM March 2 between 9:40 AM and 12:16 PM February 27 between 6:14 AM and 8:23 AM February 23 between 8:20 PM and 10:30 PM |
April 4 April 2 April 1 March 26 March 23 March 20 March 16 |
LifeLabs Medical Laboratory Services |
St. Thomas |
March 11 between 2:00 PM to 4:45 PM |
April 1 |
St. Thomas Elgin General Hospital |
St. Thomas |
March 11 between 1:30 PM to 4:00 PM March 10 between 11:30 AM to 1:00 PM March 4 between 3:00 PM and 6:00 PM March 2 between 6:30 PM and 10:03 PM March 1 between 10:00 PM February 27 between 1:30 PM and 4:00 PM |
April 1 March 31 March 25 March 23 March 23 March 20 |
Tillsonburg District Memorial Hospital |
Tillsonburg |
March 10 between 6:05 PM and 10:32 PM March 9 between 10:55 AM and 2:39 PM March 6 between 1:50 PM and 3:55 PM March 3 between 4:30 PM and 6:40 PM February 27 between 12:57 PM to 5:37 PM |
March 31 March 30 March 27 March 24 March 20 |
Central Community Health Centre |
St. Thomas |
March 10 between 9:00 AM to 5:00 PM |
March 31 |
Tillsonburg Medical Centre |
Tillsonburg |
February 25 between 1:30 PM and 4:12 PM |
March 18 |
Alexandra Hospital |
Ingersoll |
February 21 between 8:53 PM and 11:05 PM |
March 14 |
Exposure Location |
City/Town |
Exposure Dates and Times |
Monitor for Symptoms Until |
---|---|---|---|
Air Canada |
N/A |
March 2 |
March 23 |
Windsor-Essex County Health Unit
Exposure Location |
City/Town |
Exposure Dates and Times |
Monitor for Symptoms Until |
---|---|---|---|
McDonald’s Restaurant |
Leamington |
March 16 between 1:30 PM and 4:00 PM |
April 6 |
Leamington Mennonite Church |
Leamington |
March 16 between 7:00 AM and 2:00 PM |
April 6 |
Erie Shores Health Care |
Leamington |
March 14 between 8:00 AM and 11:23 AM March 10 between 9:32 PM March 7 between 9:30 PM and 10:05 PM March 6 between 6:50 PM |
April 4 April 1 March 28 March 28 |
Windsor Regional Hospital Metropolitan (Met) Campus |
Windsor |
Between March 14 at 10:10 PM and 1:40 AM on March 15 March 12 between 11:30 AM and 7:30 PM March 2 between 9:30 AM and 1:30 PM |
April 5 April 2 March 23 |
Erie Shores WIC |
Leamington |
March 13 between 1:00 PM and 5:30 PM March 11 between 12:30 PM and 5:30 PM March 6 between 12:30 PM and 3:30 PM |
April 3 April 1 March 27 |
Kingsville IDA Pharmacy |
Kingsville |
March 11 between 11:00 AM and 2:30 PM |
April 1 |
TMC Kingsville WIC/Urgent Care |
Kingsville |
March 11 between 11:00 AM and 2:30 PM March 8 between 1:15 PM and 3:35 PM March 1 between 9:20 AM and 12:14 PM |
April 1 March 29 March 22 |
Real Canadian Superstore Talbot St |
Leamington |
March 8 between 11:00AM and 1:30 PM |
March 29 |
Fresh Co. |
Leamington |
March 7 between 12:00 PM and 4:00 PM |
March 28 |
Toldo Lancer Center |
Windsor |
March 7 between 6:30 PM and 11:30 PM |
March 28 |
Chick-Fil-A |
Windsor |
March 7 between 5:30 PM and 8:00 PM |
March 28 |
Walmart Supercentre |
Leamington |
March 7 between 10:00AM and 3:30PM March 1 between 5:00 PM and 11:00 PM |
March 28 March 22 |
Old Colony Christian Academy Kingsville |
Kingsville |
March 3 between 9:00 AM and 5:30 PM February 28 between 9:00 AM and 5:30 PM |
March 24 March 21 |
La Toxica Mexican Food |
Leamington |
March 2 between 4:00 PM and 11:00 PM |
March 23 |
Cornerstone Christian Academy 1664 Talbot Rd |
Ruthven |
February 21 to February 24 |
March 17 |
Exposure Location |
City/Town |
Exposure Dates and Times |
Monitor for Symptoms Until |
---|---|---|---|
Southlake Health |
Newmarket |
February 25 between 8:25 AM and 4:00 PM |
March 18 |
Southlake Health |
Newmarket |
February 24 between 10:45 AM and 9:00 PM |
March 17 |
Korean Air |
N/A |
February 22 |
March 15 |
What is measles?
Measles is a respiratory infection that is highly contagious. Individuals with measles spread the virus by coughing or sneezing into the air. It can also be transmitted by touching your eyes, nose, or mouth after touching an infected surface. Symptoms of measles include fever, cough, runny nose, red watery eyes, and a red blotchy rash.
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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