Canada has officially lost its measles-free status after a yearlong outbreak pushed national case numbers past 5,000 — ending more than two decades without sustained transmission.
The Pan American Health Organization (PAHO) revoked the designation this week, saying the virus has circulated continuously for over 12 months.
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Canada first eliminated endemic measles in 1998 and helped the Americas region earn its “measles-free” label in 2016.
The loss is largely symbolic, but public health experts call it a warning sign for other nations — including the United States and Mexico — that declining vaccination rates are leaving millions vulnerable to outbreaks.
What’s driving the resurgence
According to The Associated Press (AP), 5,138 measles cases have been reported across Canada over the past year, including two deaths involving premature infants infected in utero. Vaccination coverage has dropped below the 95% threshold needed to block transmission.
The New York Times reports that most cases have been concentrated in Ontario and Alberta, where vaccination rates are the lowest.
The situation in Alberta is particularly concerning. Dr. Lynora Saxinger, an infectious disease specialist at the University of Alberta, estimated that approximately half a million people there may lack immunity to measles, based on vaccination rates, according to CBC News.
How officials are responding
Canadian health officials told the AP they are working with partners to share data, provide guidance and improve vaccination coverage. In Alberta, officials told The New York Times that new outreach, expanded clinic hours and targeted vaccination campaigns have delivered over 130,000 vaccine doses since March, a 50% increase over the previous year.
Physicians and researchers told CBC News that new strategies are needed. They called for the creation of interoperable vaccine registries to identify immunity gaps, as well as more systematic efforts to counter misinformation that has fueled vaccine hesitancy.
Regional impact
The outbreak isn’t isolated. The United States, which has held its own elimination status since 2000, could be next.
The AP reports the U.S. is facing its worst measles year in decades, with 1,681 cases and 44 outbreaks. PAHO reports nearly 12,600 cases regionwide — mostly in Canada, the U.S. and Mexico.
PAHO says the only way to restore measles-free status is to interrupt transmission for at least 12 months, something Canada can achieve only by improving vaccination rates and closing immunity gaps.
