Low pathogenic avian influenza (poultry),
United States of America
Information received on 22/04/2014 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
Summary
Report type Immediate notification
Date of start of the event 14/04/2014
Date of confirmation of the event 18/04/2014
Report date 22/04/2014
Date submitted to OIE 22/04/2014
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 H5
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)
New outbreaks (1)
Outbreak 1 Stanislaus County, Stanislaus, California
Date of start of the outbreak 14/04/2014
Outbreak status Resolved (10/07/2014)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 116000 116000
Affected population The affected premises is a commercial Japanese quail (Coturnix japonica) layer flock. The quail flock consists of two (2) houses. The affected layer house contains approximately 56,000 adult quail. The brooder house contains approximately 39,000 quail. There are nine (9) additional houses on the premises that house Peking ducks for egg production and contain approximately 21,000 ducks.
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 116000 ** 116000
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 The USDA Animal Plant Health Inspection Service (APHIS) and the California Department of Food and Agriculture (CDFA) are conducting a comprehensive epidemiological investigation of this event. Epidemiological summary of the event as of 22 April 2014: - A commercial Japanese quail (Coturnix japonica) layer flock was experiencing increased mortality in the adult laying population. Samples were submitted for laboratory testing and were confirmed positive for influenza A virus (IAV) subtype H5. o The amino acid sequence at the hemagglutinin protein cleavage site of the laboratory specimen is compatible with North American low pathogenic avian influenza virus. The sequence is 99.1% similar to A/American green-winged teal/Wisconsin 10OS3127/2010. - The index premises and two epidemiologically linked premises were placed under quarantine. o Laboratory testing for influenza A virus (IAV) on the two epidemiologically linked premises was negative for IAV. - Depopulation of adult quail on affected premises began. The 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
California Animal Health and Food Safety (CAHFS) Laboratory (Local laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 18/04/2014 Positive
California Animal Health and Food Safety (CAHFS) Laboratory (Local laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 19/04/2014 Negative
National Veterinary Services Laboratories (NVSL) (National laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 19/04/2014 Positive
National Veterinary Services Laboratories (NVSL) (National laboratory) Birds virus isolation Pending
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations