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Avian pathology : journal of the W.V.P.A, v.35 no.6, 2006년, pp.443 - 447
Kuk Kwon, Yong (National Veterinary Research & Quarantine Service, MAF, Anyang, 430-824, Korea) , Jeong Lee, Youn (National Veterinary Research & Quarantine Service, MAF, Anyang, 430-824, Korea) , Gu Choi, Jun (National Veterinary Research & Quarantine Service, MAF, Anyang, 430-824, Korea) , Kyoung Lee, Eun (National Veterinary Research & Quarantine Service, MAF, Anyang, 430-824, Korea) , Jin Jeon, Woo (National Veterinary Research & Quarantine Service, MAF, Anyang, 430-824, Korea) , Mi Jeong, Ok (National Veterinary Research & Quarantine Service, MAF, Anyang, 430-824, Korea) , Chul Kim, Min (National Veterinary Research & Quarantine Service, MAF, Anyang, 430-824, Korea) , Joon Joh, Seong (National Veterinary Research & Quarantine Service, MAF, Anyang, 430-824, Korea) , Hun Kwon, Jun (National Veterinary Research & Quarantine Service, MAF, Anyang, 430-824, Korea) , Hong Kim, Jae (National Veterinary Research & Quarantine Service, MAF, Anyang, 430-824, Korea)
Low pathogenic avian influenza subtype H9N8 was diagnosed on a Korean native chicken farm in Gyeonggi province, South Korea, in late April 2004. Clinical signs included moderate respiratory distress, depression, mild diarrhoea, loss of appetite and a slightly elevated mortality (1.4% in 5 days). Pathologically, mucopurulent tracheitis and air sacculitis were prominently found with urate renal deposition. The isolated A/chicken/Kr/164/04 (H9N8) had an Ala-Ser-Gly-Arg (A/S/G/R) motif at the cleavage site of haemagglutinin, which has been commonly found in H9N2 isolated from Korean poultry. Phylogenetic analysis of the haemagglutinin and neuraminidase genes of the H9N8 avian influenza virus (AIV) isolate showed that reassortment had occurred. Its haemagglutinin gene was similar to that of Korean H9N2 AIVs, but its neuraminidase gene was closely related to that of A/WBF/Kr/KCA16/03 (H3N8) isolated from the faeces of wild birds in Korea. The pathogenicity of the isolate was tested on 6-week-old specific pathogen free chickens. The inoculated virus (H9N8) was recovered from most tested organs, including the trachea, lung, kidney, spleen, and caecal tonsil. This is the first report of an outbreak of low pathogenic avian influenza in chickens caused by AIV subtype H9N8.Un cas d'influenza aviaire faiblement pathogène (LPAI) de sous type H9N8 a été diagnostiqué dans une ferme de poulets indigènes, dans la province de Gyeonggi, en Corée du Sud, en Avril 2004. Les symptômes consistaient en une détresse respiratoire modérée, une diarrhée peu importante, une perte d'appétit et une mortalité légèrement élevée (1,4% en 5 jours). Sur le plan pathologique, une trachéite mucopurulente et une aérosacculite ont été les lésions les plus souvent observées avec un dépôt d'urate au niveau des reins. La souche isolée A/chicken/Kr/164/04 (H9N8) présentait un motif Ala-Ser-Gly-Arg (A/S/G/R) au niveau du site de clivage de l'hémagglutinine (HA) qui a souvent été observé chez les souches H9N2 isolées de volailles en Corée. L'analyse phylogénétique des gènes de HA et de la neuraminidase (NA) de la souche de virus de l'influenza aviaire (AIV) H9N8 a montré qu'il s'était produit un réassortiment. Son gène HA était similaire à celui des AIVs coréens H9N2, mais son gène NA était très proche de celui de la souche A/WBF/Kr/KCA16/03 (H3N8) isolée de fèces d'oiseaux sauvage en Corée. La pathogénicité de l'isolat a été testée chez des poulets exempts de microorganismes pathogènes spécifiés âgés de 6 semaines. Le virus inoculé (H9N8) a été réisolé de la plupart des organes testés incluant la trachée, les poumons, les reins, la rate et les amygdales cæcales. C'est le premier rapport d'un cas de LPAI chez des poulets causé par un AIV de sous type H9N8.Im späten April 2004 wurde auf einer koreanischen Farm mit einheimischen Hühnern in der Gyeonggi-Provinz ein schwach pathogenes aviäres Influenzavirus (LPAI) Subtyp H9N8 isoliert. Die klinischen Symptome umfassten geringe Atembeschwerden, Störung des Allgemeinbefindens, milde Diarrhoe, Appetitlosigkeit und eine geringfügig erhöhte Mortalität (1,4 % in 5 Tagen). Pathologisch-anatomisch wurden als herausragende Veränderungen eine mukopurulente Tracheitis und Aerosacculitis sowie renale Harnsäureablagerungen gefunden. Das Isolat A/chicken/Kr/164/04 (H9N8) besaß ein Ala-Ser-Gly-Arg (A/S/G/R)-Motiv an der Spaltstelle des Hämagglutinins (HA), das auch üblicherweise bei den aus Geflüg
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