Avian influenza A(H7N9) virus
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.
Human infection caused by the avian influenza A(H7N9) virus - highlights
Background and summary
WHO Risk Assessment of human infection with avian influenza A(H7N9) virus
Overview of the emergence and characteristics of the avian influenza A(H7N9) virus
China—WHO Joint Mission on Human Infection with Avian Influenza A(H7N9) Virus, 18 – 24 April 2013, Mission Report
Technical guidance - surveillance
Technical guidance - vaccine
Technical guidance - clinical
Post-exposure antiviral chemoprophylaxis of close contacts of a patient with confirmed H7N9 virus infection and/or high risk poultry/environmental exposures.