How is avian influenza transmitted?
It has been known since 1997 that avian influenza viruses can also be transmitted to humans if there is intensive contact with diseased animals. The virus is found in the secretions of the respiratory tracts of the birds. It is, however, mainly concentrated in the droppings of infected birds. Transmission to humans probably usually takes place through inhalation of dust particles containing the virus or through contact with animals when suitable hand hygiene is not practiced. In a few cases the virus is also transmitted by consumption of raw poultry products. Isolated cases of transmission from a sick person to other people through close contact are suspected. In a very few cases (e.g. in Indonesia) the infection route could not be clarified.
