OIE: Low pathogenic avian influenza (poultry), United States of America(H7N9)

Information received on 10/03/2017 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

06/03/2017

Date of confirmation of the event

08/03/2017

Report date

10/03/2017

Date submitted to OIE

10/03/2017

Reason for notification

Reoccurrence of a listed disease

Date of previous occurrence

2017

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

New outbreaks

Summary of outbreaks

Total outbreaks: 1

Outbreak Location

  • TENNESSEE ( Giles County, Giles )

Total animals affected

Species

Susceptible

Cases

Deaths

Destroyed

Slaughtered

Birds

16500

**

0

16500

0

Outbreak statistics

Species

Apparent morbidity rate

Apparent mortality rate

Apparent case fatality rate

Proportion susceptible animals lost*

Birds

**

0.00%

**

100.00%


* 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, low pathogenic avian influenza (LPAI) H7N9 of North American wild bird lineage was detected in healthy broiler breeder chickens. This is the first detection of H7N9 LPAI poultry in TN and also the first detection of LPAI H7N9 in commercial poultry in the United States in 2017. Although this is a low pathogenicity H7 strain, as a precautionary preventive measure, the flock was depopulated.

The USDA Animal Plant Health Inspection Service (APHIS) and the Tennessee Department of Agriculture are conducting a comprehensive epidemiological investigation and have implemented enhanced surveillance and testing related to this event.

Control measures

Measures applied

  • Movement control inside the country
  • Quarantine
  • Surveillance outside containment and/or protection zone
  • Stamping out
  • Official disposal of carcasses, by-products and waste
  • Surveillance within containment and/or protection zone
  • Zoning
  • Vaccination prohibited
  • No treatment of affected animals

Measures to be applied

  • Disinfection / Disinfestation

Diagnostic test results

Laboratory name and type

National Veterinary Services Laboratories (NVSL) ( National laboratory )

Tests and results

Species

Test

Test date

Result

Birds

virus isolation

Pending

Birds

virus sequencing

08/03/2017

Positive

Future Reporting

<TABLE style="BORDER-RIGHT: medium none; BORDER-TOP: silver 1pt solid; BORDER-LEFT: medium none; WIDTH: 100%; BORDER-BOTTOM: med