British Columbia health officials have yet to identify a likely source of the infection, though none of the teen's contacts have tested positive for the virus so far.

A teenager in British Columbia was hospitalized in critical condition with the disease, and officials were working to find out how the person was exposed to the virus.

British Columbia health officer Dr. Bonnie Henry shared in a news conference that a teenager, who contracted the first presumptive case of bird flu in Canada, was in critical condition after developing 'acute respiratory distress.

Canada has reported H5N1 bird flu in wildlife and domestic birds. This year, there have been at least 24 reports of the virus in domestic bird facilities, including at least 10 infected premises in BC in October, according to data from the Canadian Food Inspection Agency.

A teenager in Canada is critically ill with the country's first human case of H5N1 bird flu. Health officials aren't sure how the youth was exposed.

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.

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.

Since Influenza A or flu viruses are named after the animal where they are most commonly found, avian viruses are naturally found in birds. H5N1 is a highly transmissible and usually mild disease in geese,