Stat reports there's no evidence that the teen has infected anyone else. The source of the infection has not been determined. Meanwhile, Hawaii — which has strict agricultural rules to prevent the spread of disease from the continental U.

The teenager hospitalized with bird flu in British Columbia, Canada, may have a variation of the virus that has a mutation making it more transmissible among people, early data shows – a warning of what the virus can do that is especially worrisome in countries such as the US where some H5N1 cases aren’t being detected.