Canada’s measles case count has passed 4,500, with the western province of Alberta — which has about five million people — recording more cases this year than the United States, figures updated Thursday showed.

World Health Organization data released this month show Canada accounts for about half of all the confirmed measles cases across the Americas region this year.

Canada officially eradicated measles in 1998, but the virus has stormed back, particularly among unvaccinated members of certain Mennonite Christian communities.

The most populous province of Ontario, which has about 16 million people, has recorded 2,366 cases, according to federal government data updated this week, which put the national case count at 4,638.

Alberta’s government, which releases its weekly figures on Thur

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