WHO Report. In the past 20 years, 870 cases of human infection with the avian influenza H5N1 virus have been reported in 21 countries. Of these cases, 457 were fatal, representing a alarming case fatality rate (CFR) of 52.5% meaning about 1 out of 2 reported infections resulted in DEATH.
Cumulative number of confirmed human cases for avian influenza A(H5N1) reported to WHO, 2003-2023, 5 January 2023
WHO publishes information on human cases with influenza A(H5N1) avian influenza infection on a monthly basis on the Influenza webpage:
Cases of human infection with A(H5N1) will only be reported on Disease Outbreak News for events that are unusual or associated with potential increased risks.
Member States will be continued to require to report information on every sporadic case of H5N1 human infection or novel influenza virus infection to WHO as per Article 6 of the International Health Regulations (2005).