A teenager in Vancouver, Canada, is hospitalized with bird flu and may be infected with a mutated strain of the H5N1 virus, increasing human transmissibility concerns. Scientists, including Dr. Jesse Bloom and Dr. Scott Hensley, are investigating the virus’s mutations, which facilitate attachment to human cells. Experts maintain that while the situation is alarming, it does not indicate the onset of a pandemic. Currently, 53 cases of bird flu have been reported in humans in the U.S.