Muhammad Morshed

West Nile virus is spread by mosquitoes. About 80 per cent of infected people have no symptoms, but the virus can cause encephalitis and can be life-threatening. (AP Photo/Rick Bowmer)

What Canadians need to know about West Nile virus, a mosquito‑borne infection that can be life‑threatening

West Nile virus arrived in North America in 1999 and spread across the continent by 2005. Here’s what you need to know about this mosquito-borne pathogen.

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