Ontario witnesses single-digit measles cases for the first time since January
The number of new measles cases in Ontario has dropped to single digits for the first time since January 2021, a significant decrease from the peak of hundreds of new cases per week during the outbreak that began in October 2020.
According to Public Health Ontario, the province reported 8 new measles cases over the past week, a marked decrease from the number reported on Jan. 16. The total number of measles infections in Ontario since the outbreak began is 2,360.
The decline in new cases is attributed to ongoing public health measures, including increased vaccination efforts, targeted immunization in affected areas, and heightened surveillance and outbreak response activities. Public health units in Ontario have implemented early doses of the MMR vaccine for infants and additional doses for young children in response to the outbreak, helping to reduce transmission.
Public health investigations actively identify exposure sites to contain the spread, and vaccination clinics have been expanded to provide earlier and additional doses for better population immunity. The reduction in new cases coincides with these enhanced outbreak response strategies focused in high-risk regions.
Although measles cases remain a concern nationally and in other provinces like Alberta, where vaccination rates are lower, Ontario’s more rigorous public health response with targeted immunization campaigns appears to have successfully curtailed the outbreak’s growth.
In summary, the single-digit new measles cases reflect the impact of intensified vaccination campaigns and outbreak control measures in Ontario in 2025. Public health officials suggest that the downward trend in weekly case counts indicates that transmission may be slowing, but they continue to urge vigilance and encourage vaccination to achieve herd immunity and prevent future outbreaks.
[1] Ontario reports 2,362 measles cases in 2025 as of Aug. 5, but new cases have declined sharply
[2] Measles outbreak in Ontario: Public Health Ontario reports 8 new cases
[3] Alberta's measles outbreak grows to 400 cases as Ontario's declines
[4] Ontario's measles outbreak: Public health response and strategies to control the outbreak
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