Highly pathogenic avian influenza,
Japan
Information received on 22/12/2020 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. 5
Date of start of the event 04/11/2020
Date of confirmation of the event 04/11/2020
Report date 22/12/2020
Date submitted to OIE 22/12/2020
Reason for notification Recurrence of a listed disease
Date of previous occurrence 14/01/2018
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 a defined zone within the country
Related reports Immediate notification (06/11/2020)
Follow-up report No. 1 (09/11/2020)
Follow-up report No. 2 (12/11/2020)
Follow-up report No. 3 (18/11/2020)
Follow-up report No. 4 (15/12/2020)
Follow-up report No. 5 (22/12/2020)
Follow-up report No. 6 (25/12/2020)
Follow-up report No. 7 (28/12/2020)
Follow-up report No. 8 (28/12/2020)
Follow-up report No. 9 (04/01/2021)
New outbreaks (5)
Outbreak 1 Tsuno-Town 1, Miyazaki
Date of start of the outbreak 01/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 30000 34 34 29966 0
Affected population Poultry(broiler)
Outbreak 2 Mitoyo-City 12, Kagawa
Date of start of the outbreak 01/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 228000 6 6 227994 0
Affected population Poultry(layer)
Outbreak 3 Mitoyo-City 13, Kagawa
Date of start of the outbreak 01/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 125000 0 125000 0
Affected population Poultry(layer)
Outbreak 4 Mitoyo-City 14, Kagawa
Date of start of the outbreak 01/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 20000 7 7 19993 0
Affected population Poultry(layer)
Outbreak 5 Miyakonojo-City 1, Miyazaki
Date of start of the outbreak 02/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 36000 72 72 35928 0
Affected population Poultry(broiler)
Summary of outbreaks Total outbreaks: 5
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 439000 119 ** 119 438881 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Birds ** 0.03% ** 100.00%
*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 As of the outbreak in Tsuno-Town 1 in this report (Case 12); On 1 December 2020, local veterinary service in Miyazaki Pref. received notification from a broiler farm and confirmed Influenza A virus by antigen-capture kits. On 2 December, LHSC conformed H5 by RT-PCR and RRT-PCR. On 2 December, stamping-out was completed. On 2 December, control measures (including disinfection) were completed. On 4 December, NIAH confirmed H5N8 HPAI by RT-PCR and sequencing. As of the outbreak in Mitoyo-City 12 in this report (Case 13); On 1 December 2020, local veterinary service in Miyazaki Pref. received notification from a laying hen farm and confirmed Influenza A virus by antigen-capture kits. On 2 December, LHSC conformed H5 by RT-PCR and RRT-PCR. On 4 December, NIAH confirmed H5N8 HPAI by RT-PCR and sequencing and stamping-out was completed. On 12 December, control measures (including disinfection) were completed. There is an epidemiologically related farm; the outbreak in Mitoyo-City 2 in this report. As of the outbreak in Mitoyo-City 13 (epidemiologically related farms to Case 13) stamping-out and control measures (including disinfection) were completed on 2 and 12 December, respectively. As of the outbreak in Mitoyo-City 14 in this report(Case 14); On 1 December 2020, local veterinary service in Kagawa Pref. received notification from a laying hen farm and confirmed Influenza A virus by antigen-capture kits. On 2 December, LHSC conformed H5 by RT-PCR and RRT-PCR. On 2 December, stamping-out was completed. On 4 December, NIAH confirmed H5N8 HPAI by RT-PCR and sequencing. On 7 December, control measures (including disinfection) were completed. As of the outbreak in Miyakonozyo-City 1 in this report (Case 15); On 2 December 2020, local veterinary service in Miyazaki Pref. received notification from a broiler farm and confirmed Influenza A virus by antigen-capture kits. On 3 December, LHSC conformed H5 by RT-PCR and RRT-PCR and stamping-out completed. On 3 December, Control measures (including disinfection) completed. On 4 December, NIAH confirmed H5N8 HPAI by RT-PCR and sequencing. Movement and shipment restrictions have been imposed on these farms within a radius of 3 km and 3-10 km of the affected farm, respectively.
Control measures
Measures applied
  • Movement control inside the country
  • Screening
  • Quarantine
  • Stamping out
  • 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
Livestock Hygiene Service Centre (Local laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 01/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 02/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 02/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 03/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 02/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 02/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 03/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds gene sequencing 04/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds gene sequencing 04/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds gene sequencing 04/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds gene sequencing 04/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 02/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 02/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 04/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 04/12/2020 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations