Low pathogenic avian influenza (poultry), United States of America (OIE, July 11 2011): No New H7N9 Outbreaks

[Giuseppe]

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

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


Information received on 08/07/2011 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. 1
  • Start date 23/06/2011
  • Date of first confirmation of the event 29/06/2011
  • Report date 08/07/2011
  • Date submitted to OIE 08/07/2011
  • Reason for notification Reoccurrence of a listed disease
  • Date of previous occurrence 26/05/2011
  • Manifestation of disease Sub-clinical infection
  • Causal agent Low pathogenic avian influenza virus
  • Serotype H7N9
  • Nature of diagnosis Laboratory (advanced)
  • This event pertains to a defined zone within the country
  • Related reports
    • Immediate notification (29/06/2011)
    • Follow-up report No. 1 (08/07/2011)
• Outbreaks
  • There are no new outbreaks in this report
• Epidemiology
  • Source of the outbreak(s) or origin of infection
    • Unknown or inconclusive
• Epidemiological comments
  • The USDA Animal Plant Health Inspection Service (APHIS) and the Minnesota Bureau of Animal Health are continuing the comprehensive epidemiological investigation of this event. Epidemiological summary of the event as of 6 July 2011:
    • The event is associated with a low pathogenic avian influenza H7N9 subtype
    • Due to high temperatures in the area, with a heat index value of well above 37.8? Celsius (100? Fahrenheit), the turkey flock suffered a heat related death loss of 2,500 turkeys. Samples were submitted to the University of Minnesota Veterinary Diagnostic Laboratory, and gross findings were consistent with death due to heat stress. The death loss was not related to avian influenza.
    • Samples were drawn on 6 July 2011 for retesting of the flock for avian influenza. Results are pending.
    • Re-sampling of any flocks within the 3 mile (5 km) surveillance zone will be accomplished during the week of 11 July 2011.
    • 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 (2010).
• Control measures
  • Measures applied Quarantine
    • Movement control inside the country
    • Zoning
    • Vaccination prohibited
    • No treatment of affected animals
  • Measures to be applied
    • Disinfection of infected premises/establishment(s)
• Diagnostic test results
  • Laboratory name and type National Veterinary Services Laboratories (NVSL) (National laboratory)
    • Tests and results: Species ? Test - Test date ? Result
      • Birds - real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) - 29/06/2011 ? Positive
      • Birds - virus isolation - Pending
• Future Reporting
  • The event is continuing. Weekly follow-up reports will be submitted.

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