Avian influenza is caused by influenza virus type A in poultry, or เรียกกัน that avian influenza, poultry infected by all this. Such as chicken, duck, water birds, birds, etc., which the avian flu virus has many species that cause disease in humans. Often found in people with the history of contact with poultry sick / dead with avian influenza, and was spread from person to person.
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