OIE information about A(H7N9)

January 21, 2014


Pigeon, Columba livia domestica,  Columbiformes

Chicken, Gallus domesticus, Galliformes

“What is influenza A(H7N9)?
In March 2013 the Chinese Public Health authorities reported the first human cases of disease due to the infection with a type A influenza virus of the strain H7N9. This strain of virus usually infects birds, and the report was followed by reinforced surveillance in bird populations in China.

On 4 April 2013 the Chinese Veterinary authorities notified the occurrence of infection of pigeons and chickens with low pathogenic avian influenza virus H7N9 to the OIE, which is suggested as being very similar to the virus infecting humans.

As this low pathogenic AI virus does not cause severe clinical signs in animals, the disease was not diagnosed before specific laboratory diagnostic tests could be conducted.”

Memorandum from another source:


Consideration about mallard. can it  become sick about AH7N9 or not?


Mallard, , Anas ssp.  Dabbling ducks, Anatidae , Anseriformes , Aves

Picture of mallard:

Yes, ducks do mount an immune response even to “low path” influenza virus infections. Dabbling ducks (those that feed near the surface rather than diving underwater) are the natural reservoir for Low Pathogenic Avian Influenza (LPAI). LPAI viruses circulate among wild birds, especially Mallards, all the time. As Jourdain and colleagues pointed out in 2010, mallards are not obviously affected by experimental infection – for example they don’t lose weight or cease moving around and they don’t show any other clear signs of disease (very slight temperature rise for 2-days) after infection. However, the authors note other studies identifying egg production problems and also the importance of further studies on wild populations as opposed to a small number of birds. {Virology Down Under, 15 May}

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