Canada has officially lost its measles elimination status after nearly three decades, following a prolonged outbreak that health authorities failed to contain. The Pan American Health Organization (PAHO) confirmed the decision Monday, marking a major setback for both Canada and the Americas region.
PAHO Director Dr. Jarbas Barbosa said the loss “represents a setback, but it is also reversible.” Canada has reported more than 5,000 confirmed measles cases across nine provinces and one northern territory over the past year. The Americas region as a whole has now lost its measles-free designation, with countries including Belize, Bolivia, Brazil, Mexico, Paraguay, and the United States also experiencing active outbreaks.
Experts say the loss of elimination status signals deeper problems within Canada’s public health system. Dr. Isaac Bogoch, an infectious disease specialist at Toronto General Hospital, called the development “a wake-up call for Canada,” stressing that barriers to vaccination and waning public confidence have fueled the spread.
Measles is one of the world’s most contagious but preventable diseases. A 95% vaccination coverage rate is required to achieve herd immunity, yet recent data show some Canadian communities have fallen well below that threshold. The standard two-dose vaccine is 97% effective, but vaccine hesitancy that grew during the COVID-19 pandemic has weakened overall protection.
The Public Health Agency of Canada acknowledged that “while transmission has slowed recently, the outbreak has persisted for over 12 months, primarily within under-vaccinated communities.” The agency said its efforts are now focused on boosting vaccination rates, improving data sharing, and strengthening surveillance.
“This is a step backward and a return to more primitive times,” said Dr. Amesh Adalja of the Johns Hopkins Center for Health Security, warning that declining trust in science has dangerous consequences.
In Alberta, one of the worst-hit provinces, officials report a 90% drop in active cases and a 50% increase in vaccinations compared to last year. The province currently has only two active infections.
According to PAHO guidelines, a country must remain free of locally transmitted measles cases for at least 12 months to maintain elimination status. The Americas had only regained its measles-free certification in 2024 after Brazil contained a major outbreak.
Meanwhile, the United States faces a similar challenge. To retain its measles-free designation, it must prove by January 20 that the outbreak that began in Texas early this year has been stopped.
