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LPAI H7N8 Dubois County Indiana - OIE


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Low pathogenic avian influenza (poultry),
United States of America
 
Information received on 19/01/2016 from Dr John Clifford, Deputy Administrator, Animal and Plant Health Inspection Service, United States Department of Agriculture, Washington, United States of America
Summary
Report typeImmediate notification
Date of start of the event16/01/2016
Date of confirmation of the event16/01/2016
Report date19/01/2016
Date submitted to OIE19/01/2016
Reason for notificationReoccurrence of a listed disease
Date of previous occurrence2015
Manifestation of diseaseSub-clinical infection
Causal agentLow pathogenic avian influenza virus
SerotypeH7N8
Nature of diagnosisLaboratory (advanced)
This event pertains toa defined zone within the country
New outbreaks (8)
Outbreak 1Dubois County 2, Dubois, INDIANA
Date of start of the outbreak16/01/2016
Outbreak statusContinuing (or date resolved not provided)
Epidemiological unitFarm
Affected animals
SpeciesSusceptibleCasesDeathsDestroyedSlaughtered
Birds21000  210000
Affected populationA commercial turkey flock.
Outbreak 2Dubois County 8, Dubois, INDIANA
Date of start of the outbreak16/01/2016
Outbreak statusContinuing (or date resolved not provided)
Epidemiological unitFarm
Affected animals
SpeciesSusceptibleCasesDeathsDestroyedSlaughtered
Birds37000  370000
Affected populationA commercial turkey flock.
Outbreak 3Dubois County 9, Dubois, INDIANA
Date of start of the outbreak16/01/2016
Outbreak statusContinuing (or date resolved not provided)
Epidemiological unitFarm
Affected animals
SpeciesSusceptibleCasesDeathsDestroyedSlaughtered
Birds16700  167000
Affected populationA commercial turkey flock.
Outbreak 4Dubois County 3, Dubois, INDIANA
Date of start of the outbreak16/01/2016
Outbreak statusContinuing (or date resolved not provided)
Epidemiological unitFarm
Affected animals
SpeciesSusceptibleCasesDeathsDestroyedSlaughtered
Birds29000  290000
Affected populationA commercial turkey flock.
Outbreak 5Dubois County 4, Dubois, INDIANA
Date of start of the outbreak16/01/2016
Outbreak statusContinuing (or date resolved not provided)
Epidemiological unitFarm
Affected animals
SpeciesSusceptibleCasesDeathsDestroyedSlaughtered
Birds12000  120000
Affected populationA commercial turkey flock.
Outbreak 6Dubois County 7, Dubois, INDIANA
Date of start of the outbreak16/01/2016
Outbreak statusContinuing (or date resolved not provided)
Epidemiological unitFarm
Affected animals
SpeciesSusceptibleCasesDeathsDestroyedSlaughtered
Birds11705    
Affected populationA commercial turkey flock.
Outbreak 7Dubois County 5, Dubois, INDIANA
Date of start of the outbreak16/01/2016
Outbreak statusContinuing (or date resolved not provided)
Epidemiological unitFarm
Affected animals
SpeciesSusceptibleCasesDeathsDestroyedSlaughtered
Birds22000  220000
Affected populationA commercial turkey flock.
Outbreak 8Dubois County 10, Dubois, INDIANA
Date of start of the outbreak16/01/2016
Outbreak statusContinuing (or date resolved not provided)
Epidemiological unitFarm
Affected animals
SpeciesSusceptibleCasesDeathsDestroyedSlaughtered
Birds6000  60000
Affected populationA commercial turkey flock.
Summary of outbreaksTotal outbreaks: 8
Total animals affected
SpeciesSusceptibleCasesDeathsDestroyedSlaughtered
Birds155405** 1437000
Outbreak statistics
SpeciesApparent morbidity rateApparent mortality rateApparent case fatality rateProportion susceptible animals lost*
Birds********
*Removed from the susceptible population through death, destruction and/or slaughter
**Not calculated because of missing information
Epidemiology
Source of the outbreak(s) or origin of infection
  • Unknown or inconclusive
Epidemiological commentsAs part of existing avian influenza response plans, the USDA Animal and Plant Health Inspection Service (APHIS) in conjunction with the Indiana State Board of Animal Health, are conducting a comprehensive epidemiological investigation and enhanced surveillance and testing in the Indiana HPAI H7N8 control area. Enhanced surveillance in the control area for the HPAI H7N8 Indiana event identified low pathogenic avian influenza (LPAI) H7N8 in 8 turkey flocks. The partial sequences of the LPAI and HPAI H7N8 viruses are nearly identical except for the HA gene insertion which imparts high pathogenicity to the HPAI virus. While the detection of AI in these additional flocks was of low pathogenicity, and the turkeys in these flocks were clinically healthy, this virus has a potential to mutate to HPAI, and, therefore, appropriate sanitary measures are being implemented to mitigate the risk. State officials have quarantined the affected premises and implemented movement controls. Depopulation of birds on the premises is under way.
 
Control measures
Measures applied
  • Movement control inside the country
  • Quarantine
  • Surveillance outside containment and/or protection zone
  • Stamping out
  • Surveillance within containment and/or protection zone
  • Zoning
  • Vaccination prohibited
  • No treatment of affected animals
Measures to be applied
  • Disinfection / Disinfestation
  • Official disposal of carcasses, by-products and waste
Diagnostic test results
Laboratory name and typeSpeciesTestTest dateResult
National Veterinary Services Laboratories (NVSL) (National laboratory)Birdsreal-time reverse transcriptase/polymerase chain reaction (RRT-PCR)16/01/2016Positive
National Veterinary Services Laboratories (NVSL) (National laboratory)Birdsvirus isolation Pending
National Veterinary Services Laboratories (NVSL) (National laboratory)Birdsvirus sequencing16/01/2016Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations
 
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