Details Emerge of Low-Path Bird Flu Outbreak

US - The H7N9 subtype of the flu virus has been identified as the cause of the recent outbreak of low-pathogenic avian influenza (LPAI) in turkeys in Minnesota, and it coincided with a period of high summer temperatures.
calendar icon 12 July 2011
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The veterinary authority sent Follow Up Report No. 1 dated 8 July to the World Organisation for Animal Health (OIE).

It identifies the sub-type of the influenza A virus as H7N9

The report adds that 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 is due to be accomplished during this week.

Further Reading

- You can visit the Avian Flu page by clicking here.
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