Highly pathogenic avian influenza,
Japan
Information received on 20/01/2015 from Dr Toshiro Kawashima, CVO, Deputy Director-General, Food Safety and Consumer Affairs Bureau, Ministry of Agriculture, Forestry and Fisheries, Tokyo, Japan
Summary
Report type Follow-up report No. 11
Date of start of the event 03/11/2014
Date of confirmation of the event 13/11/2014
Report date 20/01/2015
Date submitted to OIE 20/01/2015
Date event resolved 17/02/2015
Reason for notification Recurrence of a listed disease
Date of previous occurrence 16/04/2014
Manifestation of disease Clinical disease
Causal agent Highly pathogenic avian influenza virus
Serotype H5N8
Nature of diagnosis Clinical, Laboratory (basic), Laboratory (advanced)
This event pertains to the whole country
Related reports Immediate notification (13/11/2014)
Follow-up report No. 1 (21/11/2014)
Follow-up report No. 2 (25/11/2014)
Follow-up report No. 3 (04/12/2014)
Follow-up report No. 4 (16/12/2014)
Follow-up report No. 5 (19/12/2014)
Follow-up report No. 6 (26/12/2014)
Follow-up report No. 7 (29/12/2014)
Follow-up report No. 8 (30/12/2014)
Follow-up report No. 9 (09/01/2015)
Follow-up report No. 10 (16/01/2015)
Follow-up report No. 11 (20/01/2015)
Follow-up report No. 12 (30/01/2015)
Follow-up report No. 13 (05/02/2015)
Follow-up report No. 14 (13/02/2015)
Follow-up report No. 15 (20/02/2015)
Follow-up report No. 16 (24/04/2015)
New outbreaks (1)
Outbreak 1 Arita-cho, SAGA
Date of start of the outbreak 17/01/2015
Outbreak status Resolved (20/01/2015)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 72908 8 8 72900 0
Affected population Poultry (broiler)
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 72908 8 8 72900 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Birds 0.01% 0.01% 100.00% 100.00%
*Removed from the susceptible population through death, destruction and/or slaughter
Epidemiology
Source of the outbreak(s) or origin of infection
  • Unknown or inconclusive
Epidemiological comments On 17 January 2015, the local veterinary service in Saga prefecture received a notification from a broiler breeder farm on an increase in the number of dead birds. The samples from the dead birds were sent to the laboratory of the local veterinary service centre (Chubu Livestock Hygiene Centre) and it was found that the samples were influenza A virus positive by antigen-captive kits. On the same day the centre started RT-PCR test and on the following day it was confirmed that the subtype was H5. Stamping-out policy is applied to the affected farm and destruction of all the susceptible birds in the affected farm (approx. 72,900 birds) was completed on 18 January. Movement restriction is imposed on the farms within the radius of 3km of the affected farm. Shipment restriction is imposed on the farms within the radius of 3-10km of the affected farm. On 19 January 2015, the National Institute of Animal Health (NIAH) confirmed that the isolated virus is highly pathogenic to chickens based on gene sequencing and also identified the NA subtype as N8. Follow-up information on the second outbreak in poultry in Miyazaki reported in the follow-up report No.7: On 20 January 2015, the movement restriction was lifted since 21 days had passed without any new outbreaks after control measures including stamping out, which were completed on 29 December 2014. Follow-up information on the outbreak in poultry in Okayama reported in the follow-up report No.10: On 17 January 2015, NIAH confirmed that the isolated virus is highly pathogenic to chickens based on gene sequencing and also identified the NA subtype as N8. On 19 January 2015, destruction of all the susceptible birds in the affected farm (approx. 200,000 birds) was completed.
Control measures
Measures applied
  • Movement control inside the country
  • Screening
  • Disinfection / Disinfestation
  • Quarantine
  • Stamping out
  • Control of wildlife reservoirs
  • 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
Chubu Livestock Hygiene Centre (Local laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 18/01/2015 Positive
National Institute of Animal Health (National laboratory) Birds gene sequencing 17/01/2015 Positive
National Institute of Animal Health (National laboratory) Birds gene sequencing 19/01/2015 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations