Low pathogenic avian influenza (poultry), United States of America (OIE, August 5 2011): ''The LPAI H7N9 event is considered closed''

[Giuseppe]

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

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


Information received on 04/08/2011 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. 2 (Final report)
  • Start date 23/06/2011
  • Date of first confirmation of the event 29/06/2011
  • Report date 04/08/2011
  • Date submitted to OIE 04/08/2011
  • Date event resolved 01/08/2011
  • 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)
    • Follow-up report No. 2 (04/08/2011)
• 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 Agriculture conducted a comprehensive epidemiological investigation of this event. Final epidemiological summary of the event as of 1 August 2011:
    • The event was associated with a low pathogenic avian influenza LPAI H7N9 subtype.
    • Due to a high temperatures in the area in July, with a heat index value of well above 100? Fahrenheit (37.8 Celsius), the turkey flock suffered a heat related death loss of 2500 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.
    • Retesting of the flock on 18 July 2011 and 25 July 2011 were negative for avian influenza.
    • Final re-sampling of any flocks within the 5 km (3 mile) surveillance zone were all negative for avian influenza.
    • The flock was depopulated on 1 August 2011 via "controlled marketing" in accordance with the Minnesota Department of Agriculture Avian Influenza Controlled Marketing plan.
    • Cleaning & Disinfection (C&D) were scheduled for August 4, 2011.
  • The LPAI H7N9 event is considered closed.
  • 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) - 18/07/2011 ? Negative
      • Birds - real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) - 25/07/2011 ? Negative
      • Birds - virus isolation - 06/07/2011 ? Positive
• Future Reporting
  • The event is resolved. No more reports will be submitted.

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