Détail de la notice
Titre du Document
New avian influenza A virus subtype combination H5N7 identified in Danish mallard ducks
Auteur(s)
BRAGSTAD K. ; JØRGENSEN P. H. ; HANDBERG K. J. ; ...
Résumé
During the past years increasing incidences of influenza A zoonosis have made it of uppermost importance to possess methods for rapid and precise identification and characterisation of influenza A viruses. We present herea convenient one-step RT-PCR method that will amplify full-length haemagglutinin (HA) and neuraminidase (NA) directly from clinical samples and from all known subtypes of influenza A. We applied the method on samples collected in September 2003 from a Danish flock of mallards with general health problems and by this a previously undescribed influenza A subtype combination, H5N7, was identified. The HA gene showed great sequence similarity to the highly pathogenic avian influenza A virus (HPAIV) A/Chicken/Italy/312/97 (H5N2); however, the cleavage site sequence between HA1 and HA2 had a motif typical for low pathogenic avian influenza viruses (LPAIV). The full-length NA sequence was most closely related to the HPAIV A/Chicken/Netherlands/01/03 (H7N7) that infected chickens and humans in the Netherlands in 2003. Ten persons with direct or indirect contact with the Danish mallard ducks showed signs of influenza-like illness 2-3 days following the killing of the ducks, but no evidence of influence infections was detected. To our knowledge this is the first report of an H5N7 influenza A virus.
Editeur
Elsevier; Elsevier; Elsevier
Identifiant
PMID : 15763149 ISSN : 0168-1702 CODEN : VIREDF
Source
Virus research A. 2005, vol. 109, n° 2, pp. 181-190 [10 pages]
Langue
Anglais
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