CDC confirms first severe case of H5N1 Bird Flu in the U.S. While an investigation into the source of the infection is ongoing, it has been determined that the patient had exposure to sick and dead birds in backyard flocks.
![]() |
Bird flu or Avian Influenza or Avian flu is a disease caused by the influenza A virus, which primarily affects birds but can sometimes affect mammals including humans |
No person-to-person spread of H5 bird flu has been detected. This case does not change CDC’s overall assessment of the immediate risk to the public’s health from H5N1 bird flu, which remains low.