OIE: Highly pathogenic influenza A viruses (infection with) (non-poultry and wild birds), USA

Information received on 09/01/2017 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	27/12/2016
Date of confirmation of the event	09/01/2017
Report date	09/01/2017
Date submitted to OIE	10/01/2017
Reason for notification	Reoccurrence of a listed disease
Date of previous occurrence	10/11/2016
Manifestation of disease	Sub-clinical infection
Causal agent	Highly pathogenic influenza A virus
Serotype	H5N2
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

MONTANA ( Fergus County, Fergus )

Total animals affected

Species	Susceptible	Cases	Deaths	Destroyed	Slaughtered
Mallard:Anatidae (Anas platyrhynchos)		**

Outbreak statistics

Species	Apparent morbidity rate	Apparent mortality rate	Apparent case fatality rate	Proportion susceptible animals lost*
Mallard:Anatidae (Anas platyrhynchos)	**	**	**	**

* 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

Contact with wild species

Epidemiological comments

The sample, from a wild mallard duck, was collected on 27 December 2016 as part of the hunter – harvested wild bird avian influenza surveillance program.
Genome sequencing results show that the Montana isolate is an Eurasian/American (EA/AM) H5N2 HPAI strain. The partial genome fragments that have been analyzed thus far are >99% similar to the virus isolated from a northern pintail duck in Washington State in December 2014.
The H5N2 outbreak viruses from 2015 were all >99% similar to the northern pintail index case (A/Northern pintail/Washington/40964/2014 H5N2). Efforts to obtain sequence data for the full genome are underway.
This detection of HPAI (EA/AM) H5N2 virus in a wild bird is NOT associated with any commercial poultry in the United States.

Control measures

Measures applied	Vaccination permitted (if a vaccine exists) No treatment of affected animals
Measures to be applied	No other measures

Diagnostic test results

Laboratory name and type

National Veterinary Services ( National laboratory )

Tests and results