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Medical Advisory: Measles Outbreak Declared Over
Issued by: Dr. Azim Kasmani, MD, MSc, FRCPC, Medical Officer of Health and Commissioner
Date: October 17, 2025
On October 6, 2025, Ontario’s Chief Medical Officer of Health declared the provincial measles outbreak over, following two full incubation periods without any additional outbreak-related cases.
While the outbreak in Ontario has been declared over, measles cases continue to be reported in other parts of Canada, as well as internationally, including in the United States, Mexico, Europe, and other areas, with the ongoing potential for importation. Ontario continues to see a baseline level of non-outbreak cases, and health care providers must remain vigilant.
Niagara region experienced 13 outbreak-related cases, with the last one reported in May 2025. I would like to express my sincere gratitude to all health system partners for your collaboration and commitment in helping to control this outbreak locally and protect our community.
Immunization
Immunization remains the best protection against the measles virus and health care providers are encouraged to continue immunization of patients as per the provincial schedule. Further information may be found at Measles Vaccination Recommendations in Niagara.
Case Reporting
Please ensure all suspect cases of measles continue to be reported to Public Health. Information on how to report is available at Report a Disease to Public Health - Niagara Region, Ontario. Clinically stable suspect cases can be tested in outpatient offices with appropriate IPAC precautions as outlined in Public Health Measles: Information for Health Care Providers.
For More information
- NRPH has diagnostic and reporting resources:
- For vaccine related questions, call the Vaccine Preventable Disease program at 905-688-8248 or 1-888-505-6074 ext. 7396
- Contact the Infectious Disease Program at 905-688-8248 or 1-888-505-6074 ext. 7330, after-hours: 905-984-3690
