OIE: Low pathogenic avian influenza (poultry, H7N3), United States of America

OIE: Low pathogenic avian influenza (poultry, H7N3), United States of America
submited by kickingbird at Mar, 19, 2020 9:59 AM from OIE

Information received on 16/03/2020 from Dr Mark Davidson, Associate Administrator, USDA-APHIS, United States Department of Agriculture, Washington, United States of America

Summary

Report type	Immediate notification
Date of start of the event	10/03/2020
Date of confirmation of the event	12/03/2020
Report date	16/03/2020
Date submitted to OIE	16/03/2020
Reason for notification	Recurrence of a listed disease
Date of previous occurrence	30/08/2019
Manifestation of disease	Clinical disease
Causal agent	Low pathogenic avian influenza virus
Serotype	H7N3
Nature of diagnosis	Laboratory (advanced)
This event pertains to	a defined zone within the country

New outbreaks (3)

Outbreak 1

Union County, Union, North Carolina

Date of start of the outbreak

10/03/2020

Outbreak status

Continuing (or date resolved not provided)

Epidemiological unit

Farm

Affected animals

Species	Susceptible	Cases	Deaths	Killed and disposed of	Slaughtered
Birds	59300				0

Affected population

Commercial turkey meat flock

Outbreak 2

Anson County, Anson, North Carolina

Date of start of the outbreak

10/03/2020

Outbreak status

Continuing (or date resolved not provided)

Epidemiological unit

Farm

Affected animals

Species	Susceptible	Cases	Deaths	Killed and disposed of	Slaughtered
Birds	18000				0

Affected population

Commercial turkey breeder flock

Outbreak 3

Union County, Union, North Carolina

Date of start of the outbreak

10/03/2020

Outbreak status

Continuing (or date resolved not provided)

Epidemiological unit

Farm

Affected animals

Species	Susceptible	Cases	Deaths	Killed and disposed of	Slaughtered
Birds	12900				0

Affected population

Commercial turkey meat flock

Summary of outbreaks

Total outbreaks: 3

Total animals affected

Species	Susceptible	Cases	Deaths	Killed and disposed of	Slaughtered
Birds	90200	**			0

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 surveillance for H5/H7 Avian Influenza, H7 low pathogenic avian influenza (LPAI) was detected in a commercial turkey breeder and two turkey meat flocks. Sequencing determined subtype/pathotype of H7N3 on all premises. Clinical signs noted: slight drop in egg production in turkey breeder flock. Plan for confirmed positive flocks is euthanasia (foam method) and disposal. The USDA Animal Plant Health Inspection Service (APHIS) and the North Carolina Department of Agriculture are conducting a comprehensive epidemiological investigation and have implemented enhanced surveillance and testing related to this finding. Five additional commercial poultry premises have been quarantined and sampled for avian influenza virus. Results are pending.

Control measures

Measures applied	Movement control inside the country 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	Species	Test	Test date	Result
National Veterinary Services Laboratory (National laboratory)	Birds	gene sequencing	12/03/2020	Positive
National Veterinary Services Laboratory (National laboratory)	Birds	real-time reverse transcriptase/polymerase chain reaction (RRT-PCR)	12/03/2020	Positive

Future Reporting

The event is continuing. Weekly follow-up reports will be submitted.

See Also:

https://www.oie.int/wahis_2/public/wahid.php/Reviewreport/Review?page_refer=MapFullEventReport&reportid=33640

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