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

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and will be updated regularly, as the information may change as new cases are identified and current exposures become out of date.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

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.
    • 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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Immunization and Vaccine Preventable Diseases

ivpd@oahpp.ca

Updated 18 March 2025