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

OIE: Low pathogenic avian influenza (poultry), United States of America
submited by kickingbird at Apr, 4, 2007 6:59 AM from OIE

Information received on 03/04/2007 from Mr Peter Fernandez, Head, Animal and Plant Health Inspection Service, United States Department of Agriculture, Fort Collins, CO, United States of America

Summary

Report type	Immediate notification
Start date	30/03/2007
Date of confirmation of event	31/03/2007
Report date	03/04/2007
Date submitted to OIE	03/04/2007
Reason for notification	Reoccurrence of a listed disease
Date of previous occurrence	2002
Manifestation of disease	Sub-clinical infection
Causal agent	Low pathogenic avian influenza virus
Serotype	H5N2
Nature of diagnosis	Laboratory (basic), Laboratory (advanced)
Report pertains to	Defined zone within the country

New outbreaks

Summary of outbreaks

Total outbreaks: 1

Outbreak Location

WEST VIRGINIA (Pendleton county, Pendleton)

Total animals affected

Species	Susceptible	Cases	Deaths	Destroyed	Slaughtered
Birds	25600		0	25600	0

Outbreak statistics

Species	Apparent morbidity rate	Apparent mortality rate	Apparent case fatality rate	Proportion susceptible removed*
Birds	0.00%	0.00%	-	100.00%

* Removed from the susceptible population either through death, destruction or slaughter

Epidemiology

Source of infection

Unknown or inconclusive

Epidemiological comments

-The samples were collected from a commercial turkey flock as part of routine, pre-slaughter surveillance.
-There were no signs of illness or increased mortality in the flock.
-These turkeys were scheduled to be slaughtered the week of 3-5 April 2007.
-The virus isolated has been typed as an H5N2 subtype, and evidence to date shows it to be a low pathogenic strain. Real-time PCR results pending.
-State animal health officials have quarantined the affected premises (on 1 April 2007).
-Enhanced biosecurity measures have been implemented and include movement control of vehicles, equipment and personnel, and prohibiting all bird movement.
-Increased surveillance on all flocks within a 6 mile (about 10 Km) radius will be conducted.
-Additional testing at National Veterinary Services Laboratories is currently being conducted and results are pending.

The last occurrence of low pathogenic notifiable avian influenza in this zone was in 2002. At that time, a H7N2 virus subtype was detected.

Note by the OIE Animal Health Information Department: H5 and H7 avian influenza in its low pathogenic form in poultry is a notifiable disease as per Chapter 2.7.12. on avian influenza of the Terrestrial Animal Health Code.

Control measures

Measures already applied	Movement control inside the country Quarantine Stamping out Vaccination prohibited No treatment of affected animals
Measures to be applied	Disinfection of infected premises/establishment(s)

Diagnostic test results

Laboratory name and type

Moorefield West Virginia Laboratory (Local laboratory)

Tests and results

Species	Test	Test date	Result
Birds	agar-gel immunodiffusion (AGID)	30/03/2007	Positive

Laboratory name and type

National Veterinary Services Laboratories (NVSL) (National laboratory)

Tests and results

Species	Test	Test date	Result
Birds	haemagglutination inhibition test (HIT)	31/03/2007	Positive
Birds	neuraminidase inhibition assay	31/03/2007	Positive

Laboratory name and type

Harrisonburg Virginia Laboratory (Private Laboratory)

Tests and results

Species	Test	Test date	Result
Birds	agar-gel immunodiffusion (AGID)	30/03/2007	Positive
Birds	real-time PCR	30/03/2007	Positive

See Also:

http://www.oie.int

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