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  • Title: Outbreak of duck plague (duck herpesvirus enteritis) in numerous species of captive ducks and geese in temporal conjunction with enforced biosecurity (in-house keeping) due to the threat of avian influenza A virus of the subtype Asia H5N1.
    Author: Kaleta EF, Kuczka A, Kühnhold A, Bunzenthal C, Bönner BM, Hanka K, Redmann T, Yilmaz A.
    Journal: Dtsch Tierarztl Wochenschr; 2007 Jan; 114(1):3-11. PubMed ID: 17252929.
    Abstract:
    The continuing westward spread of avian influenza A virus of the subtype H5N1 in free-living and domestic birds forced the European Union and the German federal government to enhance all biosecurity measures including in-house keeping of all captive birds from October 20 to December 15, 2005. Movement of captive ducks and geese of many different species from a free-range system to tight enclosures and maintenance for prolonged times in such overcrowded sheds resulted in pronounced disturbance of natural behaviour, interruption of mating and breeding activities and possibly additional stress. Under these conditions the birds developed signs of severe disease and enhanced mortality twentyfour days later. A total of 17 out of 124 (14%) adult birds and 149 out of 184 year-old birds (81 %) died during the outbreak. A herpesvirus was isolated from many organs of succumbed ducks and geese that was identified as a duck plague herpesvirus by cross neutralization test using known antisera against duck plague virus. The published host range of duck plague comprises 34 species within the order Anseriformes. We report here on additional 14 species of this order that were found to be susceptible to duck plague virus. The exact source of the herpesvirus could not identified. However, low antibody titres in some ducks at day of vaccination indicate that at least some of the birds were latently infected with a duck plague herpesvirus. The remaining healthy appearing birds were subcutaneously vaccinated with a modified live duck plague vaccine (Intervet, Boxmeer, NL) that stopped losses and resulted in seroconversion in most of the vaccinated birds.
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