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and will be updated regularly, as the information may change as new cases are identified and current exposures become out of date.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

Chatham Kent Public Health

Exposure Location	City/Town	Exposure Dates and Times	Monitor for Symptoms Until
McDonald’s Restaurant 411 St Clair St	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 80 Grand Ave W Emergency Department	Chatham	March 13 between 6:25 PM and 8:30 PM	April 3
Chatham-Kent Health Alliance Wallaceburg Site 325 Margaret Ave Emergency Department	Wallaceburg	March 11 between 7:30 PM and 11:30 PM	April 1
Walmart 881 St. Clair St	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 101 Courthouse Ln	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 100 McNaughton Ave W	Chatham	March 9 between 9:30 AM and 1:30 PM	March 30
Gregory Drive Alliance Church 255 Gregory Dr W	Chatham	March 9 between 9:00 AM and 2:00 PM	March 30
John D. Bradley Centre 565 Richmond St	Chatham	March 8 between 1:00 PM and 4:30 PM	March 29
Country Kitchen 415 Richmond St	Chatham	March 7 between 9:30 AM and 1:15 PM	March 28
Growing Together Family Resource Centre – W.J. Baird Site 182 King St	Blenheim	March 4, 5, 6, 7 between 7:45 AM and 10:00 AM	March 28
Tim Horton's Park Avenue 41 Park Ave	Chatham	March 6 between 4:45 PM and 7:15 PM	March 27
EarlyON - W.J. Baird Site 182 King St	Blenheim	March 4 and March 6 between 7:45 AM and 10:00 AM	March 27
Thamesview Family Health Team 465 Grand Ave W	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 15 Mill St E	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 245 Marlborough St N	Blenheim	March 6 between 6:30 PM and 9:40 PM	March 27
Angela Merici Catholic School 801 McNaughton Ave W Gym and Common Areas	Chatham	March 6 between 5:15 PM and 9:15 PM	March 27
Chatham Christian School 475 Keil Dr S Badminton Practice	Chatham	March 4-6 between 3:30 PM and 5:30 PM	March 27
No Frills Chatham 835 Queen St	Chatham	March 5 between 10:00 AM and 2:00 PM	March 26
Ebenezer Christian School 485 McNaughton Ave E Ballhawks Practice	Chatham	March 4 between 7:30 PM and 11:30 PM	March 25
Municipality of Chatham-Kent Tilbury Municipal Office 17 Superior St	Tillbury	March 3 between 9:30 AM and 12:10 PM	March 26
ONroute Tilbury - 401 Westbound 59 Hwy 401 Westbound	Tilbury	March 1 between 5:00 PM and 8:00 PM	March 22
Chatham Christian School 475 Keil Dr S Discovery Day (Kindergarten Registration)	Chatham	February 28 between 8:30 AM and 5:00 PM	March 21
Chatham Christian School 475 Keil Dr S Celebration of Learning Event	Chatham	February 27 between 6:00 PM and 10:30 PM	March 20

City of Hamilton

Exposure Location	City/Town	Exposure Dates and Times	Monitor for Symptoms Until
McMaster Children's Hospital 1200 Main St W Emergency Department	Hamilton	March 6 between 7:53 PM and 8:53 PM	March 27
Stoney Creek Medical Walk-in Clinic 140 Centennial Parkway N	Hamilton	March 6 between 6:40PM and 9:00 PM	March 27
Hamilton Medical Centre and Walk-in Clinic 52 Cannon St West, Unit 103	Hamilton	March 5 between 9:15 AM and 12:00 PM	March 26
Costco – Stoney Creek 1330 South Service Rd	Stoney Creek	March 5 between 3:30 PM and 7:30 PM	March 26

Huron Perth Public Health

Exposure Location	City/Town	Exposure Dates and Times	Monitor for Symptoms Until
Stratford General Hospital 46 General Hospital Dr Emergency Room	Stratford	March 9 between 11:30 AM and 2:00 PM	March 30

Grand Erie Public Health Unit

Exposure Location	City/Town	Exposure Dates and Times	Monitor for Symptoms Until
Norfolk General Hospital 365 West St Emergency Department	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 105 Main St	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 1436 1st Concession Rd	Langton	March 3, 4 and 5 between 8:45 AM and 5:00 PM	March 26
Family Practice Office, Roulston's Pharmacy 65 Donly Dr North, Suite B, Unit 4	Simcoe	March 4 between 1:00 PM and 5:30 PM	March 25
Valley Heights SS 2561 Highway 59 South	Langton	February 25 between 6:00 PM and 9:30 PM	March 18
Dover Dental 18 Chapman St E	Port Dover	February 21 between 1:00 PM and 4:00 PM	March 14

Middlesex London Health Unit

Exposure Location	City/Town	Exposure Dates and Times	Monitor for Symptoms Until
Value Village 4465 Wellington Rd South	London	March 1 between 10:45 AM and 3:00 PM	March 22
Victoria Hospital 800 Commissioners Rd E Adult Emergency Department	London	February 28 between 10:43 PM and 1:10 AM on March 1	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

Peel Public Health

Exposure Location	City/Town	Exposure Dates and Times	Monitor for Symptoms Until
Credit Valley Hospital Emergency Room 2200 Eglinton Ave W	Mississauga	March 11 between 10:30 AM and 9:55 PM	April 2
Aboud Health Group 422 Burnhamthorpe Rd W	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 21 Queensway W	Mississauga	Between March 8 at 7:03 PM to 1:00 AM on March 9	March 30
Hazel McCallion Central Library 301 Burnhamthorpe Rd W	Mississauga	March 7 between 11:00 AM and 6:00 PM	March 28
Toronto Pearson International Airport, Terminal 1 6301 Silver Dart Dr	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 2200 Eglinton Ave W Emergency Department	Mississauga	Between February 27 at 8:45 PM and February 28 at 12:41 AM	March 21
Air Canada Flight AC 57 Dubai to Toronto	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 480 Huronia Rd	Barrie	March 12 between 10:55 AM to 2:00 PM	April 2
Georgian Radiology at Huronia Urgent Care Clinic 480 Huronia Rd	Barrie	March 12 between 10:55 AM to 2:00 PM	April 2
Eagle Ridge Pharmacy 480 Huronia Rd	Barrie	March 12 between 10:55 AM to 2:00 PM	April 2

South East Health Unit

Exposure Location	City/Town	Exposure Dates and Times	Monitor for Symptoms Until
Central Hastings Family Team 52 St. Lawrence St E	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 310 Julianna Dr Emergency Department	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 25 Elm St- Suite 106A	St. Thomas	March 11 between 2:00 PM to 4:45 PM	April 1
St. Thomas Elgin General Hospital 189 Elm St Emergency Department	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 and 12:15 AM on March 2 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 167 Rolph St Emergency Department	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 359 Talbot St	St. Thomas	March 10 between 9:00 AM to 5:00 PM	March 31
Tillsonburg Medical Centre 200 Broadway St	Tillsonburg	February 25 between 1:30 PM and 4:12 PM	March 18
Alexandra Hospital 29 Noxon St Emergency Department	Ingersoll	February 21 between 8:53 PM and 11:05 PM	March 14

Toronto Public Health

Exposure Location	City/Town	Exposure Dates and Times	Monitor for Symptoms Until
Air Canada Flight AC 002 Tokyo to Toronto	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 214 Talbot St W. Dining area	Leamington	March 16 between 1:30 PM and 4:00 PM	April 6
Leamington Mennonite Church 108 Mersea Rd Entire building	Leamington	March 16 between 7:00 AM and 2:00 PM	April 6
Erie Shores Health Care 194 Talbot St W Emergency Department, Main Emergency Department entrance, Triage	Leamington	March 14 between 8:00 AM and 11:23 AM March 10 between 9:32 PM and 10:29 AM on March 11 March 7 between 9:30 PM and 10:05 PM March 6 between 6:50 PM and 1:54 AM on March 7	April 4 April 1 March 28 March 28
Windsor Regional Hospital Metropolitan (Met) Campus 1995 Lens Ave Main Entrance, Elevators, 3^rd Floor Pediatric Hallway, Main Emergency Department entrance, Triage, Emergency Department	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 33 Princess St Main building entrance, Waiting room, First floor area, Patient assessment rooms	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 273 Main St E. Main entrance, Waiting room, First floor area	Kingsville	March 11 between 11:00 AM and 2:30 PM	April 1
TMC Kingsville WIC/Urgent Care 273 Main St E Waiting rooms, Patient assessment rooms	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 201 Talbot St East	Leamington	March 8 between 11:00AM and 1:30 PM	March 29
Fresh Co. 250 Erie St S	Leamington	March 7 between 12:00 PM and 4:00 PM	March 28
Toldo Lancer Center 2555 College Ave	Windsor	March 7 between 6:30 PM and 11:30 PM	March 28
Chick-Fil-A 3060 Howard Ave	Windsor	March 7 between 5:30 PM and 8:00 PM	March 28
Walmart Supercentre 304 Erie St South	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 1521 Road 4 West RR 2	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 73 Erie St South	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

York Region Public Health

Exposure Location	City/Town	Exposure Dates and Times	Monitor for Symptoms Until
Southlake Health 596 Davis Dr Pediatric Unit	Newmarket	February 25 between 8:25 AM and 4:00 PM	March 18
Southlake Health 596 Davis Dr Emergency Department	Newmarket	February 24 between 10:45 AM and 9:00 PM	March 17
Korean Air Flight KE 073 Seoul to Toronto	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.

Event

PHO Rounds: Can a Voluntary Isolation Centre Reduce Secondary Transmission of SARS-CoV-2 in Households: A Matched Cohort Study By Public He

This Public Health Ontario (PHO) Rounds will present a study which compared transmission among households where first cases used the Toronto Voluntary Isolation Centre (TVIC) with households that received routine self-isolation guidance, prior to widespread vaccine availability.

See the Event Details