Highly pathogenic avian influenza,
Japan
Information received on 25/12/2020 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. 6
Date of start of the event 04/11/2020
Date of confirmation of the event 04/11/2020
Report date 25/12/2020
Date submitted to OIE 25/12/2020
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 (8)
Outbreak 1 Gojo-City 1, Nara
Date of start of the outbreak 05/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 77000 30 30 76970 0
Affected population Poultry(laying hens)
Outbreak 2 Mihara-City 1, Hiroshima
Date of start of the outbreak 06/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 84000 10 10 83990 0
Affected population Poultry(laying hens)
Outbreak 3 Miyakonojo-City 2, Miyazaki
Date of start of the outbreak 07/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 60000 10 0 60000 0
Affected population Poultry(broiler)
Outbreak 4 Kobayashi-City 1, Miyazaki
Date of start of the outbreak 07/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 43000 20 20 42980 0
Affected population Poultry(broiler)
Outbreak 5 Mihara-City 2, Hiroshima
Date of start of the outbreak 07/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 53000 0 53000 0
Affected population Poultry(laying hens)
Outbreak 6 Saeki-City 1, Oita
Date of start of the outbreak 09/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 14000 33 33 13967 0
Affected population Poultry(broiler)
Outbreak 7 Saeki-City 2, Oita
Date of start of the outbreak 10/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 24000 0 24000 0
Affected population Poultry (broiler)
Outbreak 8 Saeki-City 3, Oita
Date of start of the outbreak 10/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 18000 0 18000 0
Affected population Poultry(broiler)
Summary of outbreaks Total outbreaks: 8
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 373000 103 ** 93 372907 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Birds ** 0.02% ** 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 1 (Gojo-City 1) in this report (Case 16): On 5 December 2020, local veterinary service in Nara Pref. received notification from a laying hen farm and confirmed influenza A virus by antigen-capture kits. On 6 December 2020, LHSC confirmed H5 by RT-PCR and RRT-PCR. On 7 December, NIAH confirmed H5N8 HPAI by RT-PCR and sequencing. On 7 December, stamping-out was completed. On 11 December, control measures (including disinfection) were completed. As of the outbreak 2 (Mihara-City 1) in this report (Case 17): On 6 December 2020, local veterinary service in Hiroshima Pref. received notification from a laying hen farm and confirmed influenza A virus by antigen-capture kits. On 7 December, LHSC confirmed H5 by RT-PCR and RRT-PCR. On 8 December, NIAH confirmed H5N8 HPAI by RT-PCR and sequencing. On 9 December, stamping-out was completed. On 17 December, control measures (including disinfection) were completed. There is an epidemiologically related farm: the outbreak 3 (Mihara-City 2) in this report. As of the outbreak 3(Mihara-City 2) in this report (epidemiologically related farm to Case 17): Stamping-out and other control measures (including disinfection) were completed on 9 and 17 December, respectively. As of the outbreak 4 (Miyakonojo-City 2) in this report (Case 18): On 7 December 2020, local veterinary service in Miyazaki Pref. conducted pre-shipment inspection at a broiler farm and confirmed influenza A virus by antigen-capture kits. LHSC confirmed H5 by RT-PCR and RRT-PCR. On 8 December, stamping-out and other control measures (including disinfection) were completed. On 9 December, NIAH confirmed H5N8 HPAI by RT-PCR and sequencing. As of the outbreak 5 (Kobayashi-City 1) in this report (Case 19): On 7 December 2020, local veterinary service in Miyazaki Pref. received notification from a broiler farm and confirmed influenza A virus by antigen-capture kits. On 8 December, LHSC confirmed H5 by RT-PCR and RRT-PCR. On 8 December, stamping-out and other control measures (including disinfection) completed. On 9 December, NIAH confirmed H5N8 HPAI by RT-PCR and sequencing. As of the outbreak 6 (Saeki-City 1) in this report (Case 20): On 9 December 2020, local veterinary service in Oita Pref. received notification from a broiler farm and confirmed influenza A virus by antigen-capture kits. On 10 December, LHSC confirmed H5 by RT-PCR and RRT-PCR. On 11 December, NIAH confirmed H5N8 HPAI by RT-PCR and sequencing. On 10 December, stamping-out and control measures (including disinfection) were completed. There are epidemiologically related farms; the outbreak 7 (Saeki-City 2) and 8 (Saeki-City 3) in this report. As of the outbreak 7 (Saeki-City 2) in this report (epidemiologically related farm to Case 20): Stamping-out and other control measures (including disinfection) were completed on 11 December, respectively. As of the outbreak 8 (Saeki-City 3) in this report (epidemiologically related farm to Case 20): Stamping-out and other control measures (including disinfection) were completed on 11 December, respectively. Movement and shipment restrictions have been imposed on there 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) 06/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 07/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 07/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 08/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 10/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 06/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 07/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 07/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 08/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 10/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds gene sequencing 07/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds gene sequencing 09/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds gene sequencing 09/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds gene sequencing 09/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds gene sequencing 11/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 07/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 09/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 09/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 09/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 11/12/2020 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations