Poultry is extremely sensitive to the virus, in particular chickens and turkeys. Quail, pheasant and partridge are also sensitive to it.
The role of vector of the illness may be played by wild and migratory birds, more particularly ducks, geese, swans, storks, cormorants, birds of prey and so on.
Web-footed birds, such as ducks and geese, are less sensitive to bird flu, but can play the role of healthy carrier and disseminator of the virus. The same applies to pigeons.
Cage and pet birds, like psittacidae and canaries, are not very sensitive to the illness.
Among mammals, it is above all the pig which can be a carrier of the virus without presenting any signs of the illness. Sensitive to various subtypes of the bird flu virus, the pig could at worst play the role of genetic "mixer" and consequently represent a risk of transmission of the illness to a human.
It cannot be excluded that in exceptional cases, cats could also be infected by the subtype H5N1, as shown by certain instances of cats carrying the virus. However, even in the case of infection, it has still not been proved that a cat could transmit the virus to a human.