Avian influenza A(H7N9) is a subtype of influenza virus that has 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.
WHO risk assessments of human infection with avian influenza A(H7N9) virus
23 February 2015
WHO Risk assessment on human infections with avian influenza A(H7N9) virus
2 October 2014
WHO Risk assessment on human infections with avian influenza A(H7N9) virus
27 June 2014
WHO Risk assessment on human infections with avian influenza A(H7N9) virus
28 February 2014
WHO Risk assessment on human infections with avian influenza A(H7N9) virus
21 January 2014
WHO Risk assessment on human infections with avian influenza A(H7N9) virus
7 June 2013
WHO Risk assessment on human infections with avian influenza A(H7N9) virus
10 May 2013
WHO Risk assessment on human infections with avian influenza A(H7N9) virus
13 April 2013
WHO Risk assessment on human infections with avian influenza A(H7N9) virus
Surveillance
12 January 2018
20 December 2013
23 May 2013
Serological detection of avian influenza A(H7N9) virus infections by turkey haemagglutination inhibition assay
23 May 2013
Serological detection of avian influenza A(H7N9) infections by microneutralization assay
23 May 2013
More content text
26 September 2013
WHO recommendation on influenza A(H7N9) vaccine virus
31 May 2013
WHO provisional recommendation on influenza A(H7N9) vaccine virus
23 May 2013
2 May 2013
Zoonotic influenza: candidate vaccine viruses and potency testing reagents
Clinical management
10 February 2017
Analysis of recent scientific information on avian influenza A(H7N9) virus
10 February 2017
Annex 1: Phylogenetic tree for haemagglutinin gene
10 February 2017
Annex 2: Phylogenetic tree for neuraminidase gene
10 February 2017
14 February 2014
Frequently Asked Questions on human infection caused by the avian influenza A(H7N9) virus
31 January 2014
Background and summary of human infection with avian influenza A(H7N9) virus
31 May 2013
Overview of the emergence and characteristics of the avian influenza A(H7N9) virus
24 April 2013
China—WHO Joint Mission on Human Infection with Avian Influenza A(H7N9) Virus, 18 – 24 April 2013
5 April 2013
Background and summary of human infection with avian influenza A(H7N9) virus
Related content