• Since November 2003, over 400 cases of human infection with highly pathogenic H5N1 (Bird) flu viruses have been reported by more than a dozen countries in Asia, Africa, the Pacific, Europe and the Near East. Indonesia and Vietnam have reported the highest number of H5N1 (Bird) flu cases to date.
  • Overall mortality in reported H5N1(Bird) flu cases is approximately 60%. The majority of cases have occurred among children and adults aged less than 40 years old. There have been very few cases of human-to-human transmission. Flu recipients in such cases have all died and there was no further spread.
  • Highly pathogenic H5N1 (Bird) flu viruses have never been detected among birds or people in the United States.

More information on the global reach of H5N1 (Bird) flu:
World Health Organization (WHO) situation updates

World Health Organization (WHO) cumulative reports of human cases