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Ergänzung:
http://www.oie.int/eng/info/hebdo/AIS_25.HTM#Sec9Epidemiological investigation
The investigation carried out showed that there had been no risk of the virus spreading beyond the infected farm: the farm operated an "all-in/all-out" production system, the turkeys were 56 days old when the clinical signs appeared and they were culled on 23 February, no animals entered or exited the farm during the risk period (which started on 2 February and ended on 23 February), and there was no epidemiological contact with other farms.
Regarding the source of contamination of this farm, where the turkeys were not kept outdoors, the three following elements clearly indicate that the source of infection of the turkey farm in Versailleux was wild fauna:
the geographical location of the affected farm: it is situated in the very heart of La Dombes wetland, where over fifty wild specimens have been confirmed positive for the Asian strain of highly pathogenic H5N1 avian influenza virus;
the first case of Asian strain highly pathogenic H5N1 avian influenza virus detected in France was located less than one kilometre from the turkey farm. This concerned a group of dead ducks, from which samples were confirmed positive for Asian strain highly pathogenic H5N1 avian influenza virus on 18 February 2006 (municipality of Joyeux);
lastly, the molecular sequence detected in the turkeys was identical to that of the first group of wild ducks.
A thorough investigation into the causes of the contamination of the Versailleux farm was carried out by experts in avian influenza epidemiology from AFSSA (French Food Safety Agency).
Their conclusions show that the contamination is linked to the numerous movements in the zone that accompanied the confirmation of the first case in the wild in France on 18 February, less than one kilometre from the farm.
Nach den Infos der OIE waren alle 11000 Tiere der "Alles Rein- Alles Raus" Farm 56 Tage alt.Zu den Spekulationen aus Frankreich:
Klinische Zeichen: erschienen plötzlich, mit einer sehr hohen Morbiditätrate und einer hohen Sterblichkeitsziffer, also nicht mal eben über Tage / Wochen mit Durchfall.
Was schreibt den die deutschsprachige Presse darüber?
http://www.wz-newsline.de/sro.php?redid=108541"Am Mittwochabend ging es den Puten gut", berichtet Clair. "Doch am Donnerstagmorgen habe ich 400 Kadaver gefunden, und die anderen waren auch angeschlagen. Da habe ich sofort kapiert, was los ist." Alle Tiere wurden getötet. Doch wie kam das H5N1-Virus in den Stall? Vergangene Woche hatten Jungtiere unter den insgesamt 11 000 Puten Durchfall. "Wir haben sie geheilt, mussten aber das Stroh wechseln", sagt Clair. "Vielleicht war das frische Stroh verseucht."
Das vermutet auch Clairs Veterinär Claude Lassus. "Mit der Inkubationszeit kommt das genau hin", erklärt er. Doch vielleicht hat der Bauer das Virus auch beim Strohwechsel mit dem Traktor eingeschleppt. Das frische Stroh hatte unter einem Hangar gelagert. Dort kommen Spatzen hin, aber kein Zugvögelkot. Auch Besucher können das H5N1-Virus eingeschleppt haben. "Wenn, dann waren es die Journalisten", meint Clair.
Wobei wir doch wieder bei der wahrscheinlichsten Variante sind, Wildvogel überträgt zu Hausgeflügel.