Cases of H5N1 bird flu in U.S. dairy and poultry workers have largely been mild. However, a new case in a British Columbia teenager has experts worried.

This marked "the first detection of a presumed human case" of H5 in Canada, authorities in British Columbia said. View on euronews

A Canadian teen is hospitalized in critical condition with what is believed to be bird flu. British Columbia health officials said Tuesday it’s not clear how the teen picked up the virus .

A Canadian teenager is hospitalized in critical condition with suspected bird flu, health officials reported Tuesday.

British Columbia's provincial health officer Dr. Bonnie Henry says the teenager who has tested positive for bird flu is in critical condition and being treated at B.C. Children's Hospital.

On Saturday, British Columbia health officials said the province had detected Canada's first human case of H5 bird flu in a teenager. Henry said the province is still identifying the exact strain, but assumes the case is H5N1.

Amid an ongoing outbreak of bird flu in American dairy herds and poultry flocks, Canadian officials have announced

Initial testing had indicated the teenager’s infection was from bird flu and was confirmed in further testing, the Public Health Agency of Canada said in a statement. The teen has been hospitalized in Vancouver since Friday and was reported in critical condition on Tuesday.

It is not known how the teen contracted bird flu, according to British Columbia health officials A teenager in British Columbia, Canada, is in critical condition after contracting the first presumptive case of bird flu in the country,

A Canadian teenager is hospitalized in critical condition with bird flu, health officials reported Tuesday. The teen has been receiving care at BC Children’s Hospital in Vancouver since Friday, the same day an initial test came back positive for H5 influenza.