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and will be updated regularly, as the information may change as new cases are identified and current exposures become out of date.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 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,
3rd 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.
    • 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 21 March 2025