Why is measles spreading in Canada, Mexico and the US?

The United States and Canada are experiencing one of their worst measles outbreaks in years, while the virus has also crossed to neighbouring Mexico.

A total of 2,500 cases and four deaths have been reported in the outbreaks across the three countries. Vaccine hesitancy has been blamed.

Here is what we know about the outbreaks so far and why measles cases are on the rise.

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