US - 1 new outbreak of low pathogenic avian influenza H7N1 in commercial broiler breeder flock in farm, Hopkins county, Texas (OIE, March 9, 2018)

[Pathfinder]

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

Information received on 09/03/2018 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 06/03/2018 Date of confirmation of the event 08/03/2018 Report date 09/03/2018 Date submitted to OIE 09/03/2018 Reason for notification Recurrence of a listed disease Date of previous occurrence 2017 Manifestation of disease Clinical disease Causal agent Low pathogenic avian influenza virus Serotype H7N1 Nature of diagnosis Laboratory (basic), Laboratory (advanced) This event pertains to a defined zone within the country

New outbreaks (1)

Outbreak 1 Hopkins county, Hopkins, TEXAS Date of start of the outbreak 06/03/2018 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Farm Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Birds 24091 Affected population Commercial broiler breeder flock

Summary of outbreaks Total outbreaks: 1 Total animals affected Species Susceptible Cases Deaths Killed and disposed of Slaughtered Birds 24091 ** 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, pre-slaughter testing and surveillance for H5/H7 avian influenza, H7N1 low pathogenic avian influenza (LPAI) was detected in a commercial broiler breeder flock based upon H7 PCR and antibody to H7 and N1. Partial HA sequencing determined the H7 to be a low pathogenic virus of North American wild bird lineage. Further characterization is pending virus recovery. The flock exhibited a slight increase in mortality and a decrease in egg production. Depopulation of the premises is underway. The USDA Animal Plant Health Inspection Service (APHIS) and the Texas Animal Health Commission are conducting a comprehensive epidemiological investigation of this incident and have implemented enhanced surveillance and testing within 10km of this finding.

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 prohibited No treatment of affected animals Measures to be applied Disinfection

Diagnostic test results Laboratory name and type Species Test Test date Result Texas A&M Veterinary Medical Diagnostic Laboratory (Local laboratory) Birds enzyme-linked immunosorbent assay (ELISA) 07/03/2018 Positive Texas A&M Veterinary Medical Diagnostic Laboratory (Local laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 07/03/2018 Positive National Veterinary Services Laboratory (National laboratory) Birds enzyme-linked immunosorbent assay (ELISA) 07/03/2018 Positive National Veterinary Services Laboratory (National laboratory) Birds haemagglutination inhibition test (HIT) 07/03/2018 Positive National Veterinary Services Laboratory (National laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 08/03/2018 Positive National Veterinary Services Laboratory (National laboratory) Birds virus isolation Pending

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

...

http://www.oie.int/wahis_2/public/wahid.php/Reviewreport/Review?page_refer=MapFullEventReport&reportid=26131