Infection of the poultry caused by any virus influenze of the type A having an index of pathogenicity per intravenous way superior with 1.2 (in chicken EOPS 6 weeks old) or any other infection caused by viruses influenza of the type A and sub-type H5 or H7 for which the sequencing of nucleotides proved the presence of multiple basic amino acids on the level of the site of cut of the hemagglutinine.
The aviary influenza is an animal disease. However, in some cases indexed by the World Health Organization, the aviary flu virus could be transmitted to the man by the means of respiratory secretions of the infected animals, their the soiled dejections or feathers and dust. Only the people who have close contacts, prolonged and repeated with sick animals are exposed to a contamination by the aviary virus A(H5N1). To date, the people having contracted this virus are all localised in Southeast Asia and the disease is not transmissible of man with man (not of inter-human contamination). The risk of occurred possible of a pandemia grippale at the man is related to the increase in the circulation of the aviary virus A(H5N1) making more probable the emergence of a new virus grippal "humanized".
