Toronto, October 10, 2025 — Ontario has officially declared the end of its measles outbreak, which began nearly a year ago and resulted in more than 2,300 confirmed infections across the province.
A weekly epidemiology report from Public Health Ontario confirmed the declaration on Monday, in line with national guidelines that consider an outbreak over 46 days after the onset of rash in the last reported case. The final measles case linked to this outbreak developed a rash on August 21.
The outbreak, which began on October 18 of last year, was traced back to an individual infected in New Brunswick. From there, the virus spread rapidly, ultimately reaching 26 public health units and infecting a total of 2,375 people.
The consequences were devastating in some cases. A baby in southwestern Ontario died after the mother contracted measles and gave birth prematurely. Another infant died during Alberta’s still-ongoing measles outbreak.
While the outbreak is now officially over, public health officials are warning that measles remains a risk. The virus continues to circulate in parts of Canada, and health authorities remain on alert for new cases.
The outbreak highlighted both the contagious nature of measles and the critical importance of vaccination. Health experts continue to urge parents and caregivers to ensure children receive the measles, mumps and rubella (MMR) vaccine on schedule to prevent future resurgences.