Description
- Measles is a very contagious virus that lives in the nose and throat of an infected person.
- It can spread very easily through the air from an infected person when they breathe, talk, cough or sneeze.
- Vaccination offers the most effective protection and the measles, mumps and rubella (MMR) vaccine has proven to be one of the safest and most effective vaccines available.
Measles in Ontario - 2025
Cases are increasing in Ontario
- Cases are rising in Ontario since March and the current rate is the highest the province has seen in the last 10 years.
- Some cases are in hospital due to their infection.
- Over 96% of these cases are not immunized or have unknown immunization status.
- There are no current cases in the Thunder Bay District.
- Places visited by recent measles cases while they are infectious (can spread the infection) are listed on Public Health Ontario's website.
Vaccine protection is the best protection
- Those travelling outside of the Thunder Bay District, even within Ontario, are recommended to make sure their vaccination status is up to date.
- Learn more about vaccine recommendations below.
Health care provider information
For Further Information
Questions about the vaccine? Call the Vaccine Preventable Diseases (VPD) Program at (807) 625-5908 or toll-free at 1-888-294-6630.
Questions about measles? Call the Infectious Disease Program at (807) 625-8318 or toll-free at 1-888-294-6630.
Health Topic
Diseases & Infections
Immunizations
Travel