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

Information received on 22/10/2018 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	19/10/2018
Date of confirmation of the event	20/10/2018
Report date	22/10/2018
Date submitted to OIE	22/10/2018
Reason for notification	Recurrence of a listed disease
Date of previous occurrence	2018
Manifestation of disease	Sub-clinical infection
Causal agent	Low pathogenic avian influenza 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

Minnesota ( Kandiyohi County, Kandiyohi )

Total animals affected

Species	Susceptible	Cases	Deaths	Killed and disposed of	Slaughtered
Birds	40000	**

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

Following the 2015 highly pathogenic avian influenza (HPAI) outbreak that occurred in central Minnesota, increased surveillance has been implemented during the spring and fall months. This routine surveillance detected a low pathogenic avian influenza (LPAI) H5N2 in a
commercial meat-type turkey flock. The flock was healthy and not showing any clinical signs of AI. Partial HA/NA sequencing determined the H5 and N2 to be a low pathogenic virus of North American wild bird lineage. Further characterization is pending virus recovery.

The Minnesota Board of Animal Health (BAH) and USDA, Animal and Plant Health Inspection Services (APHIS) are conducting an epidemiological investigation of the event and have increased surveillance in the area as a result of this detection. State officials have quarantined the
affected premises and implemented movement controls. Turkeys from this premises will be depopulated through controlled marketing.

Control measures

Measures applied	Movement control inside the country Surveillance outside containment and/or protection zone Surveillance within containment and/or protection zone Quarantine Zoning Vaccination permitted (if a vaccine exists) No treatment of affected animals
Measures to be applied	Disinfection

Diagnostic test results

Laboratory name and type

Minnesota Poultry Testing Laboratory ( Local laboratory )

Tests and results

Species	Test	Test date	Result
Birds	real-time reverse transcriptase/polymerase chain reaction (RRT-PCR)	19/10/2018