Classical swine fever,
Japan
Information received on 04/01/2021 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. 60
Date of start of the event 03/09/2018
Date of confirmation of the event 09/09/2018
Report date 04/01/2021
Date submitted to OIE 04/01/2021
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)
Follow-up report No. 49 (23/04/2020)
Follow-up report No. 50 (26/05/2020)
Follow-up report No. 51 (22/06/2020)
Follow-up report No. 52 (06/07/2020)
Follow-up report No. 53 (31/07/2020)
Follow-up report No. 54 (28/08/2020)
Follow-up report No. 55 (25/09/2020)
Follow-up report No. 56 (28/09/2020)
Follow-up report No. 57 (02/11/2020)
Follow-up report No. 58 (27/11/2020)
Follow-up report No. 59 (25/12/2020)
Follow-up report No. 60 (04/01/2021)
New outbreaks (2)
Outbreak 1 Tsuruoka City, Yamagata
Date of start of the outbreak 24/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Swine 1327 20 20 1307 0
Affected population pigs
Outbreak 2 Iga City, Mie
Date of start of the outbreak 28/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Swine 6600 20 20 6580 0
Affected population pigs
Summary of outbreaks Total outbreaks: 2
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Swine 7927 40 40 7887 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Swine 0.50% 0.50% 100.00% 100.00%
*Removed from the susceptible population through death, destruction and/or slaughter
Epidemiology
Source of the outbreak(s) or origin of infection
  • Unknown or inconclusive
Epidemiological comments Follow-up Report No. 60 As of outbreak in Tsuruoka City on 24th December (60th affected farm) On 24th December, the pig owner reported to Yamagata Livestock Hygiene Service Center (LHSC) about the increased mortality and decrease of appetite in the pig farm since 15th December. On the same day, the official veterinarian of LHSC visited the farm to conduct clinical inspection and collected samples from two dead weaned pigs and pigs in the same pigpen. Samples were tested for CSF by RT-PCR at LHSC and found to be positive. On 25th December, the National Institute of Animal Health (NIAH) carried out gene sequencing and confirmed that the detected strain is the wild one. On 28th December, stamping out was completed. As of outbreak in Iga City on 28th December (61st affected farm) On 28th December, the pig owner reported to Mie LHSC about the increased mortality in the pig farm. On the same day, the official veterinarian of LHSC visited the farm to conduct clinical inspection and collected samples from two dead weaned pigs and pigs in the same pigpen. Samples were tested for CSF by RT-PCR at LHSC and found to be positive. On 29th December, the NIAH carried out gene sequencing and confirmed that the detected strain is the wild one. On 4th January, stamping out was completed. Disinfection of contaminated materials, tools and facilities are being carried out for both outbreaks. Note 1: On 15th October 2019, Japan amended the Specific Infections Livestock Disease Control Guidelines for CSF to allow vaccination in domestic pigs in designated prefectures (vaccination recommended areas). The vaccination in domestic pigs are practiced in the following prefectures: Aichi, Chiba, Fukui, Fukushima, Gifu, Gunma, Hyogo, Ibaraki, Ishikawa, Kanagawa, Kyoto, Mie, Miyagi, Nagano, Nara, Niigata, Osaka, Okinawa, Saitama, Shiga, Shizuoka, Tochigi, Tokyo, Toyama, Wakayama, Yamagata, Yamanashi. Akita pref. will be added in the future. Note 2: When CSF outbreaks happen, Japan implements movement restrictions in the Shipment Restriction Zone (SRZ), which is established within 3-10 km radius of the affected farm, and in the Movement Restriction Zone (MRZ), which is established within 3km radius of the affected farm. SRZ will be lifted when 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 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.). Restriction zones will not be established in the area where vaccination for domestic pigs is implemented.
Control measures
Measures applied
  • Movement control inside the country
  • Surveillance outside containment and/or protection zone
  • Surveillance within containment and/or protection zone
  • Screening
  • Quarantine
  • Official disposal of carcasses, by-products and waste
  • Stamping out
  • Control of wildlife reservoirs
  • Disinfection
  • Ante and post-mortem inspections
  • Vaccination permitted (if a vaccine exists)
  • No treatment of affected animals
Measures to be applied
  • No other measures
Diagnostic test results
Laboratory name and type Species Test Test date Result
Mie Livestock Hygiene Service Centre (Local laboratory) Swine reverse transcription - polymerase chain reaction (RT-PCR) 28/12/2020 Positive
Yamagata Livestock Hygiene Service Centre (Local laboratory) Swine reverse transcription - polymerase chain reaction (RT-PCR) 24/12/2020 Positive
National Institute of Animal Health (National laboratory) Swine gene sequencing 25/12/2020 Positive
National Institute of Animal Health (National laboratory) Swine gene sequencing 29/12/2020 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations