Highly pathogenic avian influenza,
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. 7
Date of start of the event 04/11/2020
Date of confirmation of the event 04/11/2020
Report date 28/12/2020
Date submitted to OIE 28/12/2020
Reason for notification Recurrence of a listed disease
Date of previous occurrence 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 Kinokawa-City 1, Wakayama
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 67000 5 5 66995 0
Affected population Poultry(laying hens)
Outbreak 2 Mimasaka-City 1, Okayama
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 529000 67 67 528933 0
Affected population Poultry(chicks)
Outbreak 3 Mimasaka-City 2, Okayama
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 118000 0 118000 0
Affected population Poultry (chicks)
Outbreak 4 Higashiomi-City 1, Shiga
Date of start of the outbreak 12/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 11000 100 100 10900 0
Affected population Poultry(laying hens)
Outbreak 5 Miyazaki-City 1, Miyazaki
Date of start of the outbreak 13/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 70000 16 16 69984 0
Affected population Poulry(laying hens)
Outbreak 6 Mitoyo-City 15, Kagawa
Date of start of the outbreak 13/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 28000 5 5 27995 0
Affected population Poultry(laying parents)
Outbreak 7 Miyazaki-City 2, Miyazaki
Date of start of the outbreak 13/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 45000 0 45000 0
Affected population Poultry(laying hens)
Outbreak 8 Miyazaki-City 3, Miyazaki
Date of start of the outbreak 13/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 11000 0 11000 0
Affected population Poultry(chicks)
Summary of outbreaks Total outbreaks: 8
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 879000 193 ** 193 878807 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 (Kinokawa-City 1) in this report (Case 21): On 9 December 2020, local veterinary service in Wakayama Pref. received notification from a laying hen farm and confirmed influenza A virus by antigen-capture kits. On 10 December 2020, LHSC confirmed H5 by RT-PCR and RRT-PCR. On 11 December, NIAH confirmed H5N8 HPAI by RT-PCR and sequencing. On 11 December, stamping-out was completed. On 13 December, control measures (including disinfection) were completed. As of the outbreak 2 (Mimasaka-City 1) in this report (Case 22): On 10 December 2020, local veterinary service in Okayama Pref. received notification from a chick farm and confirmed influenza A virus by antigen-capture kits. On 11 December, LHSC confirmed H5 by RT-PCR and RRT-PCR. On 12 December, NIAH confirmed H5N8 HPAI by RT-PCR and sequencing. On 14 December, stamping-out was completed. On 17 December, control measures (including disinfection) were completed. There is an epidemiologically related farm: the outbreak 3 (Mimasaka-City 2) in this report. As of the outbreak 3(Mimasaka-City 2) (epidemiologically related farms to Case 22): Stamping-out and other control measures (including disinfection) were completed on 14 and 17 December, respectively. As of the outbreak 4 (Higashiomi-City 1) in this report (Case 23); On 12 December 2020, local veterinary service in Shiga Pref. received notification from a layer hen farm and confirmed influenza A virus by antigen-capture kits. On 13 December, LHSC confirmed H5 by RT-PCR and RRT-PCR. On 13 December, stamping-out was completed. On 14 December, NIAH confirmed H5N8 HPAI by RT-PCR and sequencing. On 14 December, control measures (including disinfection) were completed. As of the outbreak 5 (Miyazaki-City 1) in this report (Case 24): On 13 December 2020, local veterinary service in Miyazaki Pref. received notification from a broiler farm and confirmed influenza A virus by antigen-capture kits. On 14 December, LHSC confirmed H5 by RT-PCR and RRT-PCR. On 15 December, stamping-out was completed. NIAH confirmed H5N8 HPAI by RT-PCR and sequencing. On 17 December, control measures (including disinfection) were completed. There are epidemiologically related farms: the outbreak 6 (Miyazaki-City 2) and 7 (Miyazaki-City 3) in this report. As of the outbreak 6 (Miyazaki-City 2) (epidemiologically related farms to Case 24): Stamping-out and other control measures (including disinfection) were completed on 15 and 17 December, respectively. As of the outbreak 7 (Miyazaki-City 3) (epidemiologically related farms to Case 24): Stamping-out and other control measures (including disinfection) were completed on 15 and 17 December, respectively. As of the outbreak 8 (Mitoyo-City 15) in this report (Case 25): On 13 December 2020, local veterinary service in Oita Pref. received notification from a layer parent poultry farm and confirmed Influenza A virus by antigen-capture kits. On 14 December, LHSC confirmed H5 by RT-PCR and RRT-PCR. On 15 December, stamping-out was completed. On 17 December, NIAH confirmed H5N8 HPAI by RT-PCR and sequencing. On 17 December, control measures (including disinfection) were completed. 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) 10/12/2020 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 real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 11/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 13/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 14/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 14/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 14/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 14/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 10/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 10/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 11/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 13/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 13/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 14/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 14/12/2020 Positive
Livestock Hygiene Service Centre (Local laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 14/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds gene sequencing 11/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds gene sequencing 12/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds gene sequencing 12/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds gene sequencing 14/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds gene sequencing 15/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds gene sequencing 15/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds gene sequencing 15/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds gene sequencing 17/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 11/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 12/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 12/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 14/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 15/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 15/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 15/12/2020 Positive
National Institute of Animal Health (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 17/12/2020 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations