Linked Life Data

17058492

Source:http://linkedlifedata.com/resource/pubmed/id/17058492

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pubmed-article:17058492pubmed:abstractTextAvian influenza (AI) is a highly contagious viral disease of poultry that is found worldwide. There are two forms of AI: a mild form called low pathogenicity avian influenza (LPAI), and a severe form called highly pathogenic avian influenza (HPAI). HPAI is associated with the H5 and H7 subtypes of AI virus (AIV) and is subject to Federal control and International reporting. A real-time reverse transcription-polymerase chain reaction (rRT-PCR) assay has been developed and validated that can help in the early detection of AI outbreaks. The rRT-PCR assay can also be used to identify infections caused by H5 and H7 subtypes of AIV New isolates of AIV must be characterized as LPAI or HPAI for reporting and control purposes. The criteria for classification of an AI virus as HPAI are defined by the World Organization for Animal Health (OIE); the definition includes a virulence and a molecular criterion. The virulence requirement for HPAI is defined as an AIV killing 75% or more of eight inoculated chickens within 10 days. The molecular criterion is the presence of multiple dibasic amino acids at the proteolytic cleavage site of the haemagglutinin (H) protein. All HPAI viruses isolated before 2002 fulfilled both the virulence and molecular criteria. Consequently, nucleotide sequencing of the H gene and deduction of the amino acid motif at the H cleavage site has been successfully used to assess the virulence of H5 and H7 AIVs rapidly. Since 2002, however, there have been three outbreaks of HPAI where the viruses responsible for the outbreaks have either fulfilled the virulence criterion or the molecular criterion, but not both.lld:pubmed
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pubmed-article:17058492pubmed:authorpubmed-author:SenneD ADAlld:pubmed
pubmed-article:17058492pubmed:authorpubmed-author:PedersenJ CJClld:pubmed
pubmed-article:17058492pubmed:authorpubmed-author:SuarezD LDLlld:pubmed
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pubmed-article:17058492pubmed:volume126lld:pubmed
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pubmed-article:17058492pubmed:pagination171-7; discussion 326-7lld:pubmed
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pubmed-article:17058492pubmed:year2006lld:pubmed
pubmed-article:17058492pubmed:articleTitleRapid diagnosis of avian influenza (AI) and assessment of pathogenicity of avian H5 and H7 subtypes by molecular methods.lld:pubmed
pubmed-article:17058492pubmed:affiliationUS Department of Agriculture, Animal and Plant Health Inspection Service, Veterinary Services, National Veterinary Services Laboratories, Ames, Iowa 50010, USA. dennis.a.senne@aphis.usda.govlld:pubmed
pubmed-article:17058492pubmed:publicationTypeJournal Articlelld:pubmed