Influenza

Avian influenza A(H7N9) virus

Courtesy of WHO Collaborating Centre for Reference and Research on Influenza, National Institute of Infectious Diseases, Japan

Avian influenza A(H7N9) is a subtype of influenza viruses that have been detected in birds in the past. This particular A(H7N9) virus had not previously been seen in either animals or people until it was found in March 2013 in China.

However, since then, infections in both humans and birds have been observed. The disease is of concern because most patients have become severely ill. Most of the cases of human infection with this avian H7N9 virus have reported recent exposure to live poultry or potentially contaminated environments, especially markets where live birds have been sold. This virus does not appear to transmit easily from person to person, and sustained human-to-human transmission has not been reported.

Disease outbreak news on human infection with avian influenza A(H7N9) virus

Media Centre

  • Avian influenza A(H7N9) overview
    pdf, 1.25Mb

    Presentation by Dr Keiji Fukuda,
    WHO's Assistant Director-General for
    Health Security and Environment
    World Health Assembly
    Side event organized by China and WHO
    21 May 2013