CDC says H5N1 bird flu sample shows mutations that may help the virus bind to cells in the upper airways of people

Genetic sequences of H5N1 bird flu viruses collected from a person in Louisiana who became severely ill show signs of development of several mutations thought to affect the virus’ ability to attach to cells in the upper airways of humans, the Centers for Disease Control and Prevention reported on Thursday.

One of the mutations was also seen in a virus sample taken from a teenager in British Columbia who was in critical condition in a Vancouver hospital for weeks after contracting H5N1. 

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