Low pathogenic avian influenza (poultry),
United States of America
Information received on 06/05/2014 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
Report type Follow-up report No. 2
Date of start of the event 14/04/2014
Date of confirmation of the event 18/04/2014
Report date 06/05/2014
Date submitted to OIE 06/05/2014
Date event resolved 10/07/2014
Reason for notification Recurrence of a listed disease
Date of previous occurrence 06/08/2013
Manifestation of disease Clinical disease
Causal agent Low pathogenic avian influenza virus
Serotype H5N8
Nature of diagnosis Laboratory (advanced)
This event pertains to a defined zone within the country
Related reports Immediate notification (22/04/2014)
Follow-up report No. 1 (29/04/2014)
Follow-up report No. 2 (06/05/2014)
Follow-up report No. 3 (13/05/2014)
Follow-up report No. 4 (21/05/2014)
Follow-up report No. 5 (28/05/2014)
Follow-up report No. 6 (06/06/2014)
Follow-up report No. 7 (10/06/2014)
Follow-up report No. 8 (23/06/2014)
Follow-up report No. 9 (15/07/2014)
Outbreaks There are no new outbreaks in this report
Source of the outbreak(s) or origin of infection
  • Unknown or inconclusive
Epidemiological comments Update of the event as of 1st May 2014: - An H5N8 virus was isolated. H5 is 98.2% similar to A/mallard/California/1435/2013 (H5N5) based on sequence from the complete hemagglutinin gene. N8 is 95.7% similar to A/Mallard/Interior Alaska/6MP0160AR1/2006 (H3N8) based on sequence from the complete neuraminidase gene. Chicken pathogenicity testing is compatible with low pathogenic avian influenza virus. -‘Flock Plans’ were completed for the index premises and other at risk premises and include testing schemes, biosecurity protocols, and product movement guidelines. - Follow-up surveillance and testing for influenza A virus (IAV) continues on the two (2) epidemiologically associated farms—results are pending. In addition, a surveillance and outreach plan is being implemented within a 10 km Control Area. The joint United States Department of Agriculture (USDA) and California Department of Food and Agriculture (CDFA) epidemiological investigation and response to the event are continuing. 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 10.4. on avian influenza of the Terrestrial Animal Health Code (2013).
Control measures
Measures applied
  • Quarantine
  • Stamping out
  • Vaccination prohibited
  • No treatment of affected animals
Measures to be applied
  • No other measures
Diagnostic test results
Laboratory name and type Species Test Test date Result
National Veterinary Services Laboratories (NVSL) (National laboratory) Birds virus isolation 01/05/2014 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.