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7 Feb 2013

Highly pathogenic avian influenza, Denmark (OIE World Animal Health Information System, February 7 2013, edited)

[Source: OIE, full page: (LINK). Edited.]

Highly pathogenic avian influenza, Denmark

Information received on 07/02/2013 from Dr Per Starcke Henriksen, Chief Veterinary Officer, Danish Veterinary and Food Administration, Ministry of Food, Agriculture and Fisheries, Soborg, Denmark 

  • Summary
    • Report type Follow-up report No. 1 (Final report)
    • Date of start of the event 14/12/2012
    • Date of pre-confirmation of the event 18/01/2013
    • Report date 07/02/2013
    • Date submitted to OIE 07/02/2013
    • Date event resolved 07/02/2013
    • Reason for notification Reoccurrence of a listed disease
    • Date of previous occurrence 06/2006
    • Manifestation of disease Sub-clinical infection
    • Causal agent Highly pathogenic avian influenza virus
    • Serotype H7
    • Nature of diagnosis Laboratory (advanced)
    • This event pertains to the whole country
    • Related reports
      • Immediate notification (18/01/2013)
      • Follow-up report No. 1 (07/02/2013)
  • Outbreaks
    • There are no new outbreaks in this report
  • Epidemiology
    • Source of the outbreak(s) or origin of infection
      • Unknown or inconclusive
  • Epidemiological comments
    • On 18 January 2013 the Danish Veterinary and Food Administration (DVFA) informed about a finding of HPAI H7 in a pool of five wild mallards detected as part of the Danish avian influenza wild bird surveillance programme.
    • However, after the National Veterinary Laboratory had demonstrated the presence of HPAI H7 by sequencing a distinct band visible on the RNA gel, neither the Danish National Veterinary Laboratory (DTU VET) nor the EU Reference Laboratory on Avian Influenza (AHVLA) have been able to reproduce this finding.
    • This may be explained by the sample having contained very sparse amount of viral RNA and freezing and thawing of the material in connection with the transport of the samples to AHVLA and the storage at DTU VET has reduced the amount of genetic material to a level below detection level.
    • Attempts to isolate the virus were also unsuccessful both at DTU VET and AHVLA.
    • The lack of reproducibility of the molecular assays combined with the fact that it has not been possible to isolate the virus neither at DTU VET nor at AHVLA causes uncertainty about the finding.
    • Therefore, the Danish Veterinary and Food Administration has consequently concluded that there is not sufficient scientific documentation for the declaration of an outbreak of HPAI H7 in wild birds.
    • In addition, both DTU VET and AHVLA detected the presence of LPAI H5 based on cleavage site sequencing of the extracted RNA from the swab material.
    • However, LPAI in wild birds is not notifiable to the OIE.
    • Note by the OIE Animal Health Information Department: Since LPAI in wild birds is not notifiable to the OIE, this event will remain published for two weeks’ time since the date of this follow-up report to inform the stakeholders about this evolution, and then it will be deleted.
  • Control measures
    • Measures applied
      • No vaccination
      • No treatment of affected animals
    • Measures to be applied
      • No other measures
  • Future Reporting
    • The event is resolved. No more reports will be submitted.