Summary:
- The article reports on the first known human death in the United States due to the H5N1 avian influenza virus, also known as "bird flu."
- The victim was a person in Colorado who had been in close contact with infected poultry, highlighting the potential risk of transmission from birds to humans.
- The article emphasizes the need for continued monitoring and preparedness to address the threat of avian influenza, which has the potential to cause a serious pandemic if it becomes more easily transmissible between humans.