WHO Fact Sheet on Avian influenza
Most avian influenza viruses do not infect humans; however some, such as A (H5N1) and A (H7N9), have caused serious infections in people.
Reports of highly pathogenic AI epidemics in poultry, such as A (H5N1), can seriously impact local and global economies and international trade.
Controlling the disease in animals is the first step in decreasing risks to humans.
Avian influenza (AI) is an infectious viral disease of birds (especially wild water fowl such as ducks and geese), often causing no apparent signs of illness. AI viruses can sometimes spread to domestic poultry and cause large-scale outbreaks of serious disease. Some of these AI viruses have also been reported to cross the species barrier and cause disease or subclinical infections in humans and other mammals. AI viruses are divided into 2 groups based on their ability to cause disease in poultry: high pathogenicity or low pathogenicity. Highly pathogenic viruses result in high death rates (up to 100% mortality within 48 hours) in some poultry species. Low pathogenicity viruses also cause outbreaks in poultry but are not generally associated with severe disease.
One feature seen in many patients is the development of lower respiratory tract early in the illness. Respiratory distress, a hoarse voice, and a crackling sound when inhaling are commonly seen. Sputum production is variable and sometimes bloody.2Complications of A (H5N1) and A (H7N9) infection include hypoxemia, multiple organ dysfunction, and secondary bacterial and fungal infections.3
Animal Nutrition And Health Products