Classical swine fever,
Japan
Information received on 13/09/2019 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. 35
Date of start of the event 03/09/2018
Date of confirmation of the event 09/09/2018
Report date 13/09/2019
Date submitted to OIE 13/09/2019
Reason for notification Recurrence of a listed disease
Date of previous occurrence 1992
Manifestation of disease Clinical disease
Causal agent Classical swine fever virus
Nature of diagnosis Laboratory (basic), Laboratory (advanced)
This event pertains to a defined zone within the country
Related reports Immediate notification (09/09/2018)
Follow-up report No. 1 (18/09/2018)
Follow-up report No. 2 (26/09/2018)
Follow-up report No. 3 (01/10/2018)
Follow-up report No. 4 (09/10/2018)
Follow-up report No. 5 (16/11/2018)
Follow-up report No. 6 (22/11/2018)
Follow-up report No. 7 (03/12/2018)
Follow-up report No. 8 (10/12/2018)
Follow-up report No. 9 (18/12/2018)
Follow-up report No. 10 (25/12/2018)
Follow-up report No. 11 (07/01/2019)
Follow-up report No. 12 (16/01/2019)
Follow-up report No. 13 (22/01/2019)
Follow-up report No. 14 (29/01/2019)
Follow-up report No. 15 (06/02/2019)
Follow-up report No. 16 (14/02/2019)
Follow-up report No. 17 (22/02/2019)
Follow-up report No. 18 (01/03/2019)
Follow-up report No. 19 (08/03/2019)
Follow-up report No. 20 (15/03/2019)
Follow-up report No. 21 (25/03/2019)
Follow-up report No. 22 (01/04/2019)
Follow-up report No. 23 (08/04/2019)
Follow-up report No. 24 (12/04/2019)
Follow-up report No. 25 (19/04/2019)
Follow-up report No. 26 (26/04/2019)
Follow-up report No. 27 (17/05/2019)
Follow-up report No. 28 (26/05/2019)
Follow-up report No. 29 (07/06/2019)
Follow-up report No. 30 (21/06/2019)
Follow-up report No. 31 (23/07/2019)
Follow-up report No. 32 (06/08/2019)
Follow-up report No. 33 (10/08/2019)
Follow-up report No. 34 (18/08/2019)
Follow-up report No. 35 (13/09/2019)
Follow-up report No. 36 (24/09/2019)
Follow-up report No. 37 (11/10/2019)
Follow-up report No. 38 (01/11/2019)
Follow-up report No. 39 (19/11/2019)
Follow-up report No. 40 (29/11/2019)
Follow-up report No. 41 (20/12/2019)
Follow-up report No. 42 (27/12/2019)
Follow-up report No. 43 (08/01/2020)
Follow-up report No. 44 (21/01/2020)
Follow-up report No. 45 (10/02/2020)
Follow-up report No. 46 (21/02/2020)
Follow-up report No. 47 (06/03/2020)
Follow-up report No. 48 (25/03/2020)
New outbreaks (5)
Outbreak 1 (38) Ibigawa town, Gifu
Date of start of the outbreak 16/08/2019
Outbreak status Resolved (23/08/2019)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Swine 3611 0 3611 0
Outbreak 2 (39) Toyota city, Aichi
Date of start of the outbreak 29/08/2019
Outbreak status Resolved (02/09/2019)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Swine 252 0 252 0
Outbreak 3 (40) Nakatsugawa city, Gifu
Date of start of the outbreak 04/09/2019
Outbreak status Resolved (06/09/2019)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Swine 316 0 316 0
Outbreak 4 (41) Chichibu city, Saitama
Date of start of the outbreak 12/09/2019
Outbreak status Resolved (17/09/2019)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Swine 753 0 753 0
Outbreak 5 (41) Fuefuki city, Yamanashi
Date of start of the outbreak 12/09/2019
Outbreak status Resolved (16/09/2019)
Epidemiological unit Slaughterhouse
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Swine 178 0 178 0
Affected population The epidemiologically related slaughterhouse of the 41st affected farm
Summary of outbreaks Total outbreaks: 5
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Swine 5110 ** 0 5110 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Swine ** 0.00% ** 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 1. The 37th affected farm (Echizen city in Fukui) On August 11th, some pigs were found to be dead. That was reported to the Fukui Livestock Hygiene Service Centre (LHSC). The official veterinarians of the LHSC immediately visited the farm to conduct a clinical inspection and sampling. The samples were tested for CSF virus by RT-PCR at the LHSC. The samples were found to be positive on August 12th. On August 16th, stamping out and disinfection were completed at the 37th affected farm. 2. The 38th affected farm (Ibigawa city in Gifu) On August 16th, some pigs were found to have high fever and low appetite. That was reported to the Gifu LHSC. The official veterinarians of the LHSC immediately visited the farm to conduct a clinical inspection and sampling. The samples were tested for classical swine fever (CSF) virus by RT-PCR at the LHSC. The samples were found to be positive on August 17th. On August 23th, stamping out and disinfection were completed at the 38th affected farm. 3. The 39th affected farm (Toyota city in Aichi) On August 29th, official veterinarians of the Aichi LHSC visited this farm to conduct sampling within the active surveillance program to lift MRZ. The samples were tested for CSF virus by RT-PCR at the LHSC. The samples were found to be positive on August 31st. On September 2nd, stamping out and disinfection were completed at the 39th affected farm. 4. The 40th affected farm (Nakatsugawa city in Gifu) On September 4th, some pigs were found to have high fever and low appetite. That was reported to the Gifu LHSC. The official veterinarians of the LHSC immediately visited the farm to conduct a clinical inspection and sampling. The samples were tested for classical swine fever (CSF) virus by RT-PCR at the LHSC. The samples were found to be positive on September 5th. On September 6th, stamping out and disinfection were completed at the 40th affected farm. 5. The 41th affected farm (Chichibu city in Saitama, Fuefuki-city in Yamanashi) On September 12th, one pig at the slaughterhouse, in Fuefuki-city, was found to be dead. That was immediately reported to the Yamanashi LHSC. The official veterinarians collected samples from the dead pig and other pigs and conducted RT-PCR for CSF virus. The samples were found to be positive on September 13th. The samples were also tested for gene-sequencing at the National Institute of Animal Health (NIAH) and found to be positive on September 13th. The original farm from which the pigs were taken out, located in Chichibu-city, was identified. Stamping out and disinfection are being carried out the 41st affected farm and the epidemiologically related slaughterhouse. 6. Summary of the wild boar surveillance The report about the latest results of wild boar surveillance will be provided on the following follow-up report. Note 1: Vaccination policy in Japan is that vaccination for domestic animals only is prohibited. Since 24th March 2019, oral vaccine (bait vaccine) have been applied to wild boars in selected area in Gifu and Aichi prefecture where CSF positive cases have been found in wild boars. Note 2 about shipment restriction and movement restriction: When CSF outbreaks happen, Japan has implemented Shipment Restriction Zone (SRZ), which is established within 3-10 km radius of the affected farm, and Movement Restriction Zone (MRZ), which is established within 3km radius of the affected farm. SRZ will be lifted when both all the results of active surveillance program are negative, and 17 days have passed after the completion of full implementation of control measures (stamping out, disinfection etc.). MRZ will be lifted when both all the results of active surveillance program are negative, and 28 days have passed after the completion of full implementation of control measures (stamping out, disinfection etc.).
Control measures
Measures applied
  • Ante and post-mortem inspections
  • Disinfection
  • Control of wildlife reservoirs
  • Stamping out
  • Official disposal of carcasses, by-products and waste
  • Quarantine
  • Screening
  • Surveillance within containment and/or protection zone
  • Surveillance outside containment and/or protection zone
  • Movement control inside the country
  • 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
Aichi Central Livestock Hygiene Service Centre (Local laboratory) Swine reverse transcription - polymerase chain reaction (RT-PCR) 31/08/2019 Positive
Fukui Central Livestock Hygiene Service Centre (Local laboratory) Swine reverse transcription - polymerase chain reaction (RT-PCR) 12/08/2019 Positive
Gifu Central Livestock Hygiene Service Centre (Local laboratory) Swine reverse transcription - polymerase chain reaction (RT-PCR) 17/08/2019 Positive
Gifu Central Livestock Hygiene Service Centre (Local laboratory) Swine reverse transcription - polymerase chain reaction (RT-PCR) 05/09/2019 Positive
Saitama Central Livestock Hygiene Service Centre (Local laboratory) Swine reverse transcription - polymerase chain reaction (RT-PCR) 13/09/2019 Positive
Yamanashi Central Livestock Hygiene Service Centre (Local laboratory) Swine reverse transcription - polymerase chain reaction (RT-PCR) 13/09/2019 Positive
National Institute of Animal Health (OIE Reference Laboratory) Swine gene sequencing 13/09/2019 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations