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2018-6-23 21:31:59


OIE: Low pathogenic avian influenza (poultry)(H7N1), United States of America
submited by kickingbird at Mar, 13, 2018 13:25 PM from OIE

Information received on 09/03/2018 from Dr John Clifford, Official Delegate, Chief Trade Advisor, Animal and Plant Health Inspection Service, United States Department of Agriculture, Washington, United States of America
Summary
Report type
Immediate notification
Date of start of the event
06/03/2018
Date of confirmation of the event
08/03/2018
Report date
09/03/2018
Date submitted to OIE
09/03/2018
Reason for notification
Recurrence of a listed disease
Date of previous occurrence
2017
Manifestation of disease
Clinical disease
Causal agent
Low pathogenic avian influenza virus
Serotype
H7N1
Nature of diagnosis
Laboratory (basic), Laboratory (advanced)
This event pertains to
a defined zone within the country
New outbreaks
Summary of outbreaks
Total outbreaks: 1
Outbreak Location
  • TEXAS ( Hopkins county, Hopkins )
Total animals affected
Species
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Birds
24091
**
Outbreak statistics
Species
Apparent morbidity rate
Apparent mortality rate
Apparent case fatality rate
Proportion 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 comments
As part of routine, pre-slaughter testing and surveillance for H5/H7 avian influenza, H7N1 low pathogenic avian influenza (LPAI) was detected in a commercial broiler breeder flock based upon H7 PCR and antibody to H7 and N1. Partial HA sequencing determined the H7 to be a low pathogenic virus of North American wild bird lineage. Further characterization is pending virus recovery. The flock exhibited a slight increase in mortality and a decrease in egg production. Depopulation of the premises is underway.
The USDA Animal Plant Health Inspection Service (APHIS) and the Texas Animal Health Commission are conducting a comprehensive epidemiological investigation of this incident and have implemented enhanced surveillance and testing within 10km of this finding.
Control measures
Measures applied
  • Movement control inside the country
  • Surveillance outside containment and/or protection zone
  • Surveillance within containment and/or protection zone
  • Quarantine
  • Zoning
  • Vaccination prohibited
  • No treatment of affected animals
Measures to be applied
  • Disinfection
Diagnostic test results
Laboratory name and type
Texas A&M Veterinary Medical Diagnostic Laboratory ( Local laboratory )
Tests and results
Species
Test
Test date
Result
Birds
enzyme-linked immunosorbent assay (ELISA)
07/03/2018
Positive
Laboratory name and type
Texas A&M Veterinary Medical Diagnostic Laboratory ( Local laboratory )
Tests and results
Species
Test
Test date
Result
Birds
real-time reverse transcriptase/polymerase chain reaction (RRT-PCR)
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