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and will be updated regularly, as the information may change as new cases are identified and current exposures become out of date.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 18, 2025

Chatham Kent Public Health

Exposure Location	City/Town	Exposure Dates and Times	Monitor for Symptoms Until
Chatham-Kent Health Alliance - Emergency Department 80 Grand Ave W	Chatham	March 13 between 6:25PM and 8:30 PM	April 3
Walmart 881 St. Clair St	Chatham	March 10 between 10:00AM and 1:30PM March 7 between 11:15AM and 2:30PM	March 31 March 28
Country Kitchen 415 Richmond St	Chatham	March 7 between 9:30AM and 1:15PM	March 28
Tim Horton's Park Avenue 41 Park Ave	Chatham	March 6 between 4:45PM and 7:15PM	March 27
EarlyON - W.J. Baird Site 182 King St	Blenheim	March 4 and March 6 between 7:45 AM and 10 AM	March 27
Growing Together Family Resource Centre – W.J. Baird Site 182 King St	Blenheim	March 4, 5, 6, 7 between 7:45 AM and 10 AM	March 28
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
YMCA Chatham 101 Courthouse Lane	Chatham	March 6 between 12:45 PM and 4:05 PM February 25 between 1:00 PM and 4:30pm	March 27 March 18
Angela Merici Catholic School - gym and common areas 801 McNaughton Ave W	Chatham	March 6 between 5:15 PM and 9:15 PM	March 27
Ebenezer Christian School - Ballhawks practice 485 McNaughton Ave E	Chatham	March 4 between 7:30 PM and 11:30 PM	March 25
Chatham Christian School - Badminton practice 475 Keil Dr S	Chatham	March 4-6 between 3:30 PM and 5:30 PM	March 27
Municipality of Chatham-Kent Tilbury Municipal Office 17 Superior Street	Tillbury	March 3 between 9:30AM and 12:10PM	March 26
ONroute Tilbury - 401 Westbound 59 Hwy 401 Westbound	Tilbury	March 1 between 5:00 PM and 8:00 PM	March 22
No Frills Chatham 835 Queen St	Chatham	March 5 between 10 AM and 2 PM	March 26
Chatham Christian School Discovery Day – Kindergarten Registration 475 Keil Dr S	Chatham	February 28 between 8:30 AM and 5PM	March 21
Chatham Christian School Celebration of Learning Event 475 Keil Dr S	Chatham	February 27 between 6 PM and 10:30 PM	March 20

City of Hamilton

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

Huron Perth Public Health

Exposure Location	City/Town	Exposure Dates and Times	Monitor for Symptoms Until
Stratford General Hospital - Emergency Room 46 General Hospital Dr	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 – Emergency Department 365 West St	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 February 19 between 6 PM and 10:15 PM	April 1 March 30 March 19 March 12
Delhi Community Health Centre Walk-in Clinic 105 Main St	Delhi	March 7 between 10:00 AM and 2:00 PM February 8 between 9 AM and 12 PM	March 28 March 1
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 Drive North, Suite B, Unit 4	Simcoe	March 4 between 1 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 PM and 4 PM	March 14
Blue Elephant 95 Norfolk St S	Simcoe	February 19 between 5 PM and 9 PM	March 12
Norfolk General Hospital 365 West St	Simcoe	February 19 between 6 PM and 10:15 PM	March 12
Wilkinson’s Your Independent Grocer 227 Main St	Delhi	February 14 between 7 AM and 5:30 PM	March 7
Tim Hortons (A-wing, 1st floor) 200 Terrace Hill St	Brantford	February 12 between 9 AM and 11:15 AM February 11 between 10 AM and 12:15 PM February 11 between 4 PM and 6:15 PM February 10 between 4 PM and 6:15 PM	March 5 March 4 March 4 March 3

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 - Adult Emergency Department 800 Commissioners Rd E	London	February 28 between 10:43 PM and 1:10 AM on March 1	March 22
Children's Hospital - Pediatric Emergency Department 800 Commissioners Rd E	London	February 20 between 5:29PM and 7:41PM February 18 between 8:45 PM and 11:15 PM	March 13 March 11

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 - Adult Emergency Department
800 Commissioners Rd E

London

February 28 between 10:43 PM
and 1:10 AM on March 1

March 22

Children's Hospital - Pediatric Emergency Department
800 Commissioners Rd E

London

February 20 between 5:29PM and 7:41PM

February 18 between 8:45 PM and 11:15 PM

March 13

March 11

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
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 - Emergency Department 2200 Eglinton Ave W	Mississauga	Between February 27 at 8:45 PM and February 28 at 12:41 AM	March 21
Aboud Health Walk-in Clinic and Pharmacy 422 Burnhamthorpe Rd W	Mississauga	February 27 between 3:15 PM and 7 PM	March 20
Cornerstone Medical Centre-Walk-In Urgent Care & adjoining Pharmacy 8990 Chinguacousy Road Unit 9	Brampton	February 16 between 1:52 PM and 5:13 PM	March 9

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 Emergency Department 310 Julianna Dr	Woodstock	March 14 between 12:15PM and 2:30PM March 12 between 6:57PM and 9:04PM March 11 between 7:09 AM and 9:30 AM March 5 between 1:43 PM and 5:16 PM March 2 between 9:40AM and 12:16PM February 27 between 6:14 AM and 8:23 AM February 23 between 8:20 PM and 10:30 PM February 21 between 10:43 AM and 1:26 PM Between February 17 at 10:38 PM and February 18 at 1:47 AM	April 4 April 2 April 1 March 26 March 23 March 20 March 16 March 14 March 11
Tillsonburg District Memorial Hospital - Emergency Department 167 Rolph St	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
St. Thomas Elgin General Hospital Emergency Department 189 Elm St	St. Thomas	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 February 19 between 12:55 PM and 3:25 PM February 17 between 9:20 PM and 11:47 PM February 16 between 5 PM and 7:26 PM Between February 13 at 5:15 PM and February 14 at 1:24 AM February 9 between 5 AM and 10:45 AM	March 25 March 23 March 23 March 20 March 12 March 10 March 9 March 7 March 2
Tillsonburg Medical Centre 200 Broadway St	Tillsonburg	February 25 between 1:30 PM and 4:12 PM	March 18
Alexandra Hospital Emergency Department 29 Noxon St	Ingersoll	February 21 between 8:53 PM and 11:05 PM	March 14
RBC Royal Bank 121 Broadway St	Tillsonburg	February 18, 19, 20 between 8 AM and 5 PM	March 13
East Elgin Community Complex 531 Talbot St W	Aylmer	February 17 between 5 PM and 8 PM February 15 between 9 AM and 1 PM	March 10 March 8
LifeLabs Medical Laboratory 510 Ingersoll Ave, Suite 205	Woodstock	February 12 between 10:11 AM and 12:35 PM	March 5
Lifelabs Medical Laboratory L8 – 424 Talbot St W	Aylmer	February 10 between 10:30 AM and 2:15 PM	March 3
St. Thomas Walk-in Medical Clinic 105 – 230 First Ave	St. Thomas	February 9 between 9:30 AM and 1:30 PM February 8 between 12:30 PM to 5:30 PM February 7 between 7 PM and 9 PM	March 2 March 1 February 28
Remedy’s Rx – Health Centre Pharmacy Inc 230 First Ave	St. Thomas	February 8 between 12:30 PM and 5:30 PM	March 1

Windsor-Essex County Health Unit

Exposure Location	City/Town	Exposure Dates and Times	Monitor for Symptoms Until
Erie Shores Health Care- Emergency Room 194 Talbot St W	Leamington	March 14 between 8:00 AM and 11:23 AM March 7 between 9:30PM and 10:05PM March 6 between 6:50 PM and 1:54 AM on March 7	April 4 March 28 March 28
Windsor Regional Hospital - Metropolitan (Met) Campus - Main Entrance - Elevators - 3rd Floor Pediatric Hallway 1995 Lens Avenue	Windsor	March 12 between 11:30 AM and 7:30 PM March 2 between 9:30 AM and 1:30 PM	April 2 March 23
Erie Shores WIC 33 Princess St	Leamington	March 11 between 12:30PM and 5:30PM March 6 between 12:30 PM and 3:30 PM	April 1 March 27
Real Canadian Superstore Talbot St 201 Talbot Street East	Leamington	March 8 between 11:00AM and 1:30PM	March 29
TMC Kingsville WIC/Urgent Care 273 Main St E	Kingsville	March 8 between 1:15 PM and 3:35 PM March 1 between 9:20 AM and 12:14 PM	March 29 March 22
Fresh Co. 250 Erie St S	Leamington	March 7 between 12:00 PM and 4:00 PM	March 28
Toldo Lancer Center 2555 College Avenue	Windsor	March 7 between 6:30 PM and 11:30 PM	March 28
Chick-Fil-A 3060 Howard Avenue	Windsor	March 7 between 5:30 PM and 8:00 PM	March 28
Walmart Supercentre 304 Erie Street 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 Street 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 – Pediatric Unit 596 Davis Dr	Newmarket	February 25 between 8:25 AM and 4PM	March 18
Southlake Health – Emergency Department 596 Davis Dr	Newmarket	February 24 between 10:45 AM and 9 PM	March 17

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