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Avian influenza

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clinical signs in birds and highly pathogenic (HPAI) that can cause severe ... Avian influenza is a disease listed under the World Organization for ...

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Avian influenzaPage 1 1 Avian influenzaAvian influenza What is Avian Influenza (AI)? Avian influenza (AI) caused by the influenza virus Type A can affect several species of food producing birds (chickens turkeys quails guinea fowl etc.) as well as pet birds and wild birds with some strains resulting in high mortality rates. The virus has also been isolated from mammalian species including humans rats and mice weasels and ferrets pigs cats tigers and dogs. AI viruses are not new. There are many descriptions of historicaloutbreaks of AI in domestic poultry throughout available literature. There are many strains of AI viruses and generally can be classified intotwo categories: low pathogenic (LPAI) that typically causes little or no clinical signs in birds and highly pathogenic (HPAI) that can cause severe clinical signs and/or high mortality in birds. The Asian origin highly pathogenic H5N1 strain of the AI virus has attracted much attention over the last few years because of significant outbreaks globally in domestic and wild birds. Concern is raised because of the degree of virulence not only in poultry but also in wild birds as wellas the ability to infect mammalian species. While AI viruses are generally highly species specific the highly pathogenic H5N1 AI virus has also infected humans. Low pathogenic strains of AI H5N1 virus exist but do not produce significant clinical signs in birds. Avian influenza is a disease listed under the World Organization for Animal Health (OIE) Terrestrial Animal Health Code 2006 (Article 2.1.1.3). Notifiable avian influenza includes two particular subtypes H5 and H7 that must be reported to the OIE (as per Chapter 1.1.2. Notification of Diseases and Epidemiological Information). Where is the disease found? AI occurs worldwide and different strains are more prevalent in certain areas of the world than others. Of particular interest are outbreaks of high ...

Source: www.oie.int

 

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