Health officials in British Columbia, Canada, have failed, for now, to confirm how a teenager there became infected with H5N1 bird flu.

A teenager in British Columbia who is being treated in the critical care unit was confirmed to have been infected with the bird flu virus.

Health officials have announced six more H5N1 bird flu infections in humans: five in California and the first known case in Oregon.

BC's top doctor Bonnie Henry says that a potential source of the exposure to the teen is a pet dog that was sick at the time the young person was infected.But she said all the testing that was done on the dog have come back negative for the virus.