Virus influenza aviar pdf

Avian influenza a h7n9 is a subtype of influenza viruses that have been detected in birds in the past. This particular a h7n9 virus had not previously been seen in either animals or people until it was found in march 20 in china. Influenza a virus subtype h5n1 ah5n1 is a subtype of the influenza a virus which can cause illness in humans and many other animal species. Bird flu, like its human counterpart, is a highly contagious migratory virus that can be lethal to flocks of wildbirds and domesticated poultry particularly when its discovery prompts massive exterminations to prevent its spread to humans. Sometimes influenza viruses change mutate, which allows them to infect mammals such as pigs, dogs or people. However, sporadic human infections with avian flu viruses. This work is licensed under a creative commons attribution. Avian influenza ai or bird flu is a highly contagious viral infection which can affect all species of birds and can manifest itself in different ways depending mainly on the ability of the virus to cause disease pathogenicity and on the species affected. Since the last update4, two new laboratoryconfirmed human cases of avian influenza ah5n1 virus infection were reported to who. Two avian influenza viruses are current pandemic threats. Influenza diagnosis clinical and epidemiological characteristics increase of febrile respiratory illness lab isolation of influenza virus from clinical specimen e. Avian influenza is a global threat to food animal production and distribution systems, as well as human health.

Guidance for huntersprotect yourself and your birds from. Influenza ah1n1pdm09, influenza ah3n2, and influenza b virus infections were detected in all 3 years, and the epidemic season extended from november through may. Type b and c influenza viruses are not known to infect poultry or do not cause disease in poultry. Avian influenza refers to the disease caused by infection with avian bird influenza flu type a viruses. The virus has high homology to human h5n6 influenza strains isolated from southeast china. However, since then, infections in both humans and birds have been observed. These subtypes differ and are classified based on a combination of two groups of proteins on the surface of the influenza a virus.

Avian influenza, known informally as avian flu or bird flu, is a variety of influenza caused by viruses adapted to birds. Bird flu is similar to swine flu, dog flu, horse flu and human flu as an illness caused by strains of influenza viruses that have adapted to a specific host. There are many different subtypes of influenza a viruses. The recovery rate was no better when virus isolation was used of the 5 isolates, 3 were from rrtpcr and 2 were from direct virus isolation. However, sporadic human infections with avian flu viruses have occurred. Genetic characterization of avian influenza ah5n6 virus. We isolated highly pathogenic avian influenza ah5n6 virus clade 2. However, sustained, comprehensive, and coordinated global efforts to monitor the continually changing genetic diversity of avian influenza viruses circulating in nature are lacking 1,2. These viruses occur naturally among wild aquatic birds worldwide and can infect domestic poultry and other bird and animal species. A birdadapted strain of h5n1, called hpai ah5n1 for highly pathogenic avian influenza virus of type a of subtype h5n1, is the highly pathogenic causative agent of h5n1 flu, commonly known as avian influenza bird flu. Avian influenza ai is an infectious disease of birds caused by type a strains of the influenza virus. Avian influenza viruses avian influenza ah5 viruses current situation. Timely identification of pandemic influenza threats depends on monitoring for highly pathogenic avian influenza viruses. It usually infects water fowl or poultry such as chickens, ducks, geese and turkeys.