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Avian influenza, also known as avian flu or bird flu, is a disease caused by the influenza A virus, which primarily affects birds but can sometimes affect mammals including humans. [1] Wild aquatic birds are the primary host of the influenza A virus, which is enzootic (continually present) in many bird populations.
16 maj 2024 · Avian influenza, sometimes known as bird flu, is a disease caused by a virus that mainly affects birds but can also affect mammals, including humans. It primarily spreads from infected birds to humans through close contact with birds or contaminated environments, such as in backyard poultry farm settings and at markets where birds are sold.
Avian influenza is a highly contagious viral disease that affects both domestic and wild birds. Avian influenza viruses have also been isolated, although less frequently, from mammalian species, including humans.
3 paź 2023 · Wild aquatic birds are the primary natural reservoir for most subtypes of influenza A viruses. Avian influenza outbreaks in poultry can have immediate and severe consequences for the agricultural sector.
The natural reservoir of influenza A strains is a diverse pool of viruses among aquatic wild bird populations – the avian influenza (AI) viruses. These viruses are of high pathogenicity (HPAI) and low pathogenicity (LPAI), according to their severity in the avian species they usually infect.
Only some avian influenza A(H5) and A(H7) viruses are classified as HPAI A viruses, while most A(H5) and A(H7) viruses circulating among birds are LPAI A viruses. HPAI A(H5) or A(H7) virus infections can cause disease that affects multiple internal organs with mortality up to 90% to 100% in chickens, often within 48 hours.
Over recent years, avian influenza or bird flu due to highly pathogenic avian influenza (HPAI) A (H5N1) has devastated millions of poultry flocks and affected wild birds in different regions of the world, including the WHO European Region.
