Scientists have identified mutations in the avian flu virus isolated from a hospitalized teenager in Vancouver that could potentially enhance its ability to spread among humans. However, there is currently no evidence of the mutated virus spreading beyond the infected patient.
The H5N1 bird flu virus affecting the teenager is distinct from the strain circulating in dairy cattle in the United States and is more closely related to a strain found in wild birds in the Pacific Northwest. Despite the genetic changes observed, health officials have not identified any further cases linked to the mutated virus.
