The genetic analysis of the H5N1 avian flu virus in specimens from the nation's first severely ill hospitalized patient in ...

The agency, in its latest update released Thursday, said the mutations were not found in samples taken from wild birds, suggesting the virus changed over the course of the patient’s infection.

Genetic analysis suggests the bird flu virus has the capacity to mutate in ways that could make it more transmissible to ...

The ongoing spread of bird flu in the United States has alarmed experts -- not just because of human cases causing severe ...