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Avian influenza (bird flu)
Avian influenza (bird flu) is a disease of birds caused by influenza viruses closely related to human influenza viruses.
It is an important disease economically for poultry farmers because of losses in poultry flocks. Transmission to humans in close contact with poultry or other birds occurs rarely and only with some strains of avian influenza.
The potential for transformation of avian influenza into a form that both causes severe disease in humans and spreads easily from person to person is a great concern for world health.
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