From the Editor's Desk

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

During the late summer of 1999, New York City recorded an unusual number of cases of encephalitis (inflammation of the brain). At the same time, the Bronx Zoo reported a massive death of birds and mammals.

The human encephalitis cases might have been attributed to a flare-up of an endemic arbovirus (a virus transmitted by a tick or mosquito bite) such as St. Louis encephalitis, but the concurrent bird and mammal deaths suggested the human illnesses warranted further investigation.

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