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


Low pathogenic avian influenza (poultry) H5N8, United States of America


Information received on 06/05/2014 from Dr John Clifford, Deputy Administrator, Animal and Plant Health Inspection Service, United States Department of Agriculture, Washington, United States of America
  • Summary
    • Report type Follow-up report No. 2
    • Date of start of the event 14/04/2014
    • Date of pre-confirmation of the event 18/04/2014
    • Report date 06/05/2014
    • Date submitted to OIE 06/05/2014
    • Reason for notification Reoccurrence of a listed disease
    • Date of previous occurrence 06/08/2013
    • Manifestation of disease Clinical disease
    • Causal agent Low pathogenic avian influenza virus
    • Serotype H5N8
    • Nature of diagnosis Laboratory (advanced)
    • This event pertains to a defined zone within the country
    • Related reports
      • Immediate notification (22/04/2014)
      • Follow-up report No. 1 (29/04/2014)
      • Follow-up report No. 2 (06/05/2014)
  • Outbreaks
    • There are no new outbreaks in this report
  • Epidemiology
    • Source of the outbreak(s) or origin of infection
      • Unknown or inconclusive
  • Epidemiological comments
    • Update of the event as of 1st May 2014:
      • An H5N8 virus was isolated.
        • H5 is 98.2% similar to A/mallard/California/1435/2013 (H5N5) based on sequence from the complete hemagglutinin gene.
        • N8 is 95.7% similar to A/Mallard/Interior Alaska/6MP0160AR1/2006 (H3N8) based on sequence from the complete neuraminidase gene.
        • Chicken pathogenicity testing is compatible with low pathogenic avian influenza virus.
      • Flock Plans’ were completed for the index premises and other at risk premises and include testing schemes, biosecurity protocols, and product movement guidelines.
      • Follow-up surveillance and testing for influenza A virus (IAV) continues on the two (2) epidemiologically associated farms—results are pending.
        • In addition, a surveillance and outreach plan is being implemented within a 10 km Control Area.
        • The joint United States Department of Agriculture (USDA) and California Department of Food and Agriculture (CDFA) epidemiological investigation and response to the event are continuing.
    • Note by the OIE Animal Health Information Department:
      • H5 and H7 avian influenza in its low pathogenic form in poultry is a notifiable disease as per Chapter 10.4. on avian influenza of the Terrestrial Animal Health Code (2013).
  • Control measures
    • Measures applied
      • Stamping out
      • Quarantine
      • Vaccination prohibited
      • No treatment of affected animals
    • Measures to be applied
      • No other measures
  • Diagnostic test results
    • Laboratory name and type – Species – Test - Test date – Result
      • National Veterinary Services Laboratories (NVSL) (National laboratory) – Birds - virus isolation - 01/05/2014 – Positive
  • Future Reporting
    • The event is continuing. Weekly follow-up reports will be submitted.
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