Update on local measles activity and testing
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To: Local Health Care Providers
Background
Localized transmission of measles was identified in the Public Health Sudbury & Districts service area in July 2025. Since August 14, 2025, no additional cases or onward transmission have been detected.
However, measles continues to circulate in Ontario and around the world. Consider measles in the differential diagnosis of patients with rash or respiratory symptoms like runny nose and cough, particularly in individuals with recent travel to higher-risk areas or locations with known exposures. If you suspect or are testing for measles, contact Public Health immediately.
Testing guidance
Ontario testing guidelines have changed. A revised sample requisition has been included at the bottom of this Advisory Alert for reference.
- Diagnostic testing for measles requires: (1) nasopharyngeal or throat swab for PCR AND (2) urine for PCR.
- Each specimen requires its own lab requisition and biohazard bag. Clearly mark “suspect measles case” in bright bold letters on each lab requisition and mark “STAT” on the outside of the biohazard bag.
- Specimens for PCR can be stored in the fridge between 2 and 8 degrees Celsius for up to 72 hours. For more information, read the measles specimen storage and transportation requirements (Public Health Ontario).
- Diagnostic serology (IgG and IgM) is no longer recommended.
Resources
- Laboratory Test Information Index (Public Health Ontario)
- Measles (Public Health Ontario)
- Measles IPAC Checklist for Clinics and Specimen Collection Centres (PDF from Public Health Ontario).
- Measles: Information for Health Care Providers (PDF from Public Health Ontario)
Sincerely,
Original Signed By
Emily Groot, MD, MPH, FRCPC (she/her)
Associate Medical Officer of Health