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

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