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Every year, thousands of people around the world die of measles — a preventable disease with a vaccine offered for free in Canada.

While it may have a reputation as being a problem affecting the developing world, measles is making a startling comeback in Canada. Explore how the virus spread to Canada from countries like the Philippines and the Netherlands.

A nationwide guide to measles in Canada

The following maps show each step as the virus spread from one location to another. Not all origins are known.

Interactive by Stuart A. Thompson
Research by Stephanie Chambers, Rick Cash and Allan Maki
Sources: The World Health Organization, the Centre for Disease Control, The National Institute for Public Hleath and the Environment, B.C. Centre for Disease Control, Fraser Health, Waterloo Public Health, Middlesex-London Health Unit, New York City Dept of Health and Mental Hygiene, California Dept of Public Health, various provincial governments, The Globe and Mail, CP and Winnipeg Free Press