Measles

Description
  • Measles is a very contagious virus that can spread easily but vaccination offers safe and effective protection.
  • TBDHU is reporting NO CASES.
  • The Ontario outbreak was declared over on October 5, 2025.

 

pregnancy and measles

  • Ontario outbreak over: The outbreak was declared over on October 6, 2025. Ontario continues to monitor the situation.
  • No cases in Thunder Bay District: The TBDHU service area has very good vaccination rates against measles which further lower the risk to the public.
  • Exposures across Ontario: The website Measles Exposures in Ontario lists places visited by recent measles cases while the person with measles was infectious.
  • Vaccine protection is the best protection: For those who are protected, it is very unlikely that they will develop symptoms. See the "Learn more about measles" section below for more information on what is considered protection against measles. Almost all infant, child and adolescent Ontario outbreak cases (96.4%, n=1,671) were unimmunized, while 69.9% (n=439) of adults were unimmunized (figure 3 on page 9). See the "Vaccine protection is the best protection" section below for more 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