Highly pathogenic influenza A viruses (infection with) (non-poultry including wild birds),
Japan
Information received on 28/12/2020 from Dr Norio Kumagai, Director, Chief Veterinary Officer, Animal Health Division, Food Safety and Consumer Affairs Bureau, Ministry of Agriculture, Forestry and Fisheries, Tokyo, Japan
Summary
Report type Follow-up report No. 1
Date of start of the event 03/12/2020
Date of confirmation of the event 09/12/2020
Report date 28/12/2020
Date submitted to OIE 28/12/2020
Reason for notification Recurrence of a listed disease
Date of previous occurrence 25/03/2018
Manifestation of disease Clinical disease
Causal agent Highly pathogenic influenza A virus
Serotype H5N8
Nature of diagnosis Laboratory (basic), Laboratory (advanced)
This event pertains to a defined zone within the country
Related reports Immediate notification (23/12/2020)
Follow-up report No. 1 (28/12/2020)
Follow-up report No. 2 (04/01/2021)
New outbreaks (2)
Outbreak 1 Oyodo-Town 1, Nara
Date of start of the outbreak 20/12/2020
Outbreak status Resolved (20/12/2020)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Northern Goshawk:Accipiter gentilis(Accipitridae) 1 1 0 0
Affected population A dead Accipiter gentilis was found and tested.
Outbreak 2 Izumi-City 2, Kagoshima
Date of start of the outbreak 22/12/2020
Outbreak status Resolved (22/12/2020)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Mandarin Duck:Aix galericulata(Anatidae) 1 0 1 0
Affected population A weaken Aix galericulata was found and tested.
Summary of outbreaks Total outbreaks: 2
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Northern Goshawk:Accipiter gentilis(Accipitridae) 1 1 0 0
Mandarin Duck:Aix galericulata(Anatidae) 1 0 1 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Northern Goshawk:Accipiter gentilis(Accipitridae) ** ** 100.00% **
Mandarin Duck:Aix galericulata(Anatidae) ** ** 0.00% **
*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 New outbreaks in wild birds are as follows: Outbreak 1 - Oyodo-Town 1 - A dead Accipiter gentilis (Northern goshawk) was collected on 20 December 2020 and tested against avian influenza virus. The Tottori University conducted RT-PCR and gene sequencing tests and confirmed that the subtype of the virus was H5N8. Outbreak 2 - Izumi-City 2 - A weaken Aix galericulata (Mandarin duck) was collected on 22 December 2020 and tested against avian influenza virus. The Kagoshima University conducted RT-PCR and gene sequencing tests and confirmed that the subtype of the virus was H5N8.
Control measures
Measures applied
  • Screening
  • Disinfection
  • 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
Kagoshima University (Private Laboratory) Mandarin Duck gene sequencing 25/12/2020 Positive
Kagoshima University (Private Laboratory) Mandarin Duck reverse transcription - polymerase chain reaction (RT-PCR) 25/12/2020 Positive
Tottori University (Private Laboratory) Northern Goshawk gene sequencing 25/12/2020 Positive
Tottori University (Private Laboratory) Northern Goshawk reverse transcription - polymerase chain reaction (RT-PCR) 25/12/2020 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations