The Return of Measles: A Public Health Crisis in Canada
In a shocking turn of events, measles, a disease once thought to be eliminated from Canada, has made a startling comeback. This resurgence has sparked urgent questions and concerns among health professionals and the public alike.
The year 1998 marked a significant milestone in Canada's public health history, as measles was officially declared eliminated. However, fast forward to 2025, and the disease has reemerged with a vengeance, casting a shadow over the country's health system.
But here's where it gets controversial...
Despite the initial success in eradicating measles, the disease has resurfaced, with Canada reporting nearly three times as many cases as its southern neighbor, the United States, which also experienced a significant outbreak.
Measles, a highly contagious virus, had infected tens of thousands of Canadians annually before the introduction of the measles vaccine in 1963. The disease was nearly universal, with a staggering 97% to 99% seropositivity rate among individuals born before the vaccine's widespread availability. Seropositivity indicates the presence of measles antibodies in an individual's blood, a clear sign of prior infection.
The Challenge of Elimination vs. Eradication
Canada achieved elimination status in 1998, but it's important to note the distinction between elimination and eradication. Elimination means the disease is no longer found or transmitted within a specific region, while eradication signifies the complete absence of the disease worldwide. To date, only two diseases have been eradicated: smallpox and rinderpest, a cattle disease.
The Risk of Resurgence
Since measles was eliminated, not eradicated, the risk of its return has always loomed. Canada's last significant measles outbreak in 2011, primarily in central Quebec, served as a stark reminder of this threat. The current outbreak, concentrated in Alberta and Ontario, has its roots in a Mennonite gathering in New Brunswick, where an individual contracted the virus and brought it back home.
The Role of Mennonite Communities
Mennonite communities, with their diverse practices and varying levels of technology and medical care usage, have played a significant role in the spread of the virus. Conservative Mennonite groups, known for their limited use of modern medicine, have historically had lower vaccination rates. In Ontario and Alberta, where large Mennonite populations reside, nearly all those infected were unvaccinated.
Vaccine Hesitancy and Misinformation
The drop in vaccination rates that has allowed measles to regain a foothold in Canada cannot be solely attributed to Mennonite communities. Since the COVID-19 pandemic, vaccine hesitancy has risen, fueled by mistrust in the healthcare system and the spread of misinformation. Major cities in Alberta, such as Calgary and Edmonton, have seen vaccination rates drop to the high 70s or barely reach 80% in the most vaccinated districts.
The Impact on Canada's Health System
With over 5,329 measles cases in 2025, compared to just 16 during 2020-2023, Canada officially lost its measles-free status, as recognized by the Pan American Health Organization. This loss is not just a symbolic blow to Canada's image but also puts vulnerable Canadians at risk, including those who are immunocompromised or too young to receive the vaccine.
The Road to Recovery
While the brunt of the outbreak appears to be over, with no reported cases in Alberta since December 13, 2025, and in Ontario since December 6, 2025, new cases are still being reported in Manitoba and Quebec. Regaining measles elimination status may take time, as seen with Brazil and Venezuela, which regained their status in 2024 after losing it in 2018 and 2019, respectively.
A Call for Action
Despite the challenges ahead, public health experts believe Canada has the ability to eliminate measles once again. With increased investment in the public health system and efforts to rebuild confidence in vaccinations, Canada can work towards a measles-free future. The road may be long, but the country has the tools and expertise to tackle this public health crisis.
And this is the part most people miss...
The resurgence of measles in Canada serves as a stark reminder of the importance of sustained public health efforts and the need to address vaccine hesitancy and misinformation. It's a call to action for all Canadians to prioritize their health and the health of their communities.
