Health officials in British Columbia, Canada, have closed their investigation into how a teenager became infected with H5N1 bird flu due to lack of leads. The teen remains in serious condition but has shown signs of progress. Genetic sequencing revealed the virus is from wild birds in the Fraser Valley. Analysis showed signs of mutation making it more infectious to humans, but the virus has died out in the teen. Tests on those in contact with the teen and animals were negative. The source of the infection remains unknown, similar to a case in Missouri. Officials are confident there are no additional cases at this time.
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Case of bird flu infection in British Columbia is still a mystery, for now
