Canada loses Measles-free status
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Canada loses measles elimination status; US could be next
Measles elimination status means a country has not experienced an uncontrollable spread of the virus for at least one year.
Canada eliminated measles in 1998. The U.S. followed two years later, in 2000. There are multiple criteria for losing an official measles elimination status, including the declines in vaccination rates observed in both countries. But the most significant factor is having ongoing measles transmission for a full year.