Canada has recently lost its measles elimination status, a designation it had held since 1998, due to ongoing measles outbreaks that have persisted for over 12 months. The World Health Organization (WHO) and the Pan American Health Organization (PAHO) consider a country to have eliminated measles when there is no longer evidence of the virus circulating within the population. Unfortunately, Canada has not been able to meet this criteria since October 2024, with over 5,000 reported measles cases in the past year, primarily in Ontario and Alberta.
The main reason for this resurgence of measles in Canada is the decline in measles, mumps, and rubella (MMR) vaccination rates. Health Canada data shows a steady decrease in MMR coverage from 2019 to 2022, dropping from 89.5% to 81.3%. These rates are well below the herd immunity threshold of 95%, which is necessary to prevent the spread of measles in a population. Without sufficient vaccination coverage, the measles virus can easily find susceptible individuals to infect and continue spreading.
In order to regain its measles elimination status, Canada will need to rapidly increase MMR vaccination rates. This will require significant effort and resources to contain the outbreaks and prevent further spread of the virus. Reclaiming elimination status is possible, but it will be a challenging task that must be addressed promptly.
The United States, which achieved measles elimination status in 2000, is also at risk of losing this designation due to declining vaccination rates and increasing measles outbreaks. With over 1,600 measles cases reported in 2025 alone, the U.S. is facing similar challenges to Canada in maintaining its elimination status. Public health officials and government agencies must prioritize vaccination efforts to prevent a resurgence of measles in the country.
If the U.S. were to lose its measles elimination status, it would represent a significant setback in public health efforts to control and prevent vaccine-preventable diseases. It is crucial for both Canada and the U.S. to prioritize vaccination and public health initiatives to avoid the reemergence of measles and other preventable diseases.
