Canada has been stripped of its measles elimination status after failing to interrupt transmission within one year of an outbreak that continues to spread in parts of the country.

The Public Health Agency of Canada said Monday it was notified by The Pan American Health Organization, a regional arm of the World Health Organization, that Canada lost its designation – an accomplishment it held for 27 years.

“While transmission has slowed recently, the outbreak has persisted for over 12 months, primarily within under-vaccinated communities,” the statement said.