Classical swine fever,
Japan
Information received on 28/09/2020 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. 56
Date of start of the event 03/09/2018
Date of confirmation of the event 09/09/2018
Report date 28/09/2020
Date submitted to OIE 28/09/2020
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)
New outbreaks (1)
Outbreak 1 Takasaki City, Gunma
Date of start of the outbreak 25/09/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Swine 5390 3 3 5387 0
Affected population Cases: 3 weaned piglets
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Swine 5390 3 3 5387 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Swine 0.06% 0.06% 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 1. A outbreak in Takasaki City on 26th September (59th affected farm) On 25th September, the pig owner reported to Gunma Livestock Hygiene Service Centre(LHSC) about the increased mortality and diarrhea in the pig farm since the beginning of September. On the same day, the official veterinarian of LHSC visited farm to conduct clinical inspection and collected samples from three dead weaned piglets. Samples were tested for CSF by RT-PCR at LHSC and found to be positive. On 26th September, the National Institute of Animal Health(NIAH) carried out gene sequencing and confirmed that the detected strain is wild one. Stamping out and disinfection of contaminated materials, tools and facilities are being carried out. 2.Summary of the wild boar surveillance (As of 24th September) [Fukushima prefecture (since 9th September 2020)] Tested (RT-PCR): 53 wild boars, Positive: 5 [Ibaraki prefecture (since 26th June 2020)] Tested (RT-PCR): 829 wild boars, Positive: 1 [Gunma prefecture (since 14th September 2018)] Tested (RT-PCR): 1,482 wild boars, Positive: 50 [Saitama prefecture (since 14th September 2018)] Tested (RT-PCR): 958 wild boars, Positive: 108 [Tokyo prefecture (since 2nd July 2020)] Tested (RT-PCR): 106 wild boars, Positive: 5 [Kanagawa prefecture (since 14th September 2018] Tested (RT-PCR): 465 wild boars, Positive: 2 [Niigata prefecture (since 14th September 2018] Tested (RT-PCR): 218 wild boars, Positive: 10 [Toyama prefecture (since 14th September 2018)] Tested (RT-PCR): 428 wild boars, Positive: 76 [Ishikawa prefecture (since 14th September 2018)] Tested (RT-PCR): 425 wild boars, Positive: 39 [Fukui prefecture (since 14th September 2018)] Tested (RT-PCR): 981 wild boars, Positive: 90 [Yamanashi prefecture (since 14th of September 2018)] Tested (RT-PCR): 246 wild boars, Positive: 45 [Nagano prefecture (since 14th of September 2018)] Tested (RT-PCR): 947 wild boars, Positive: 242 [Gifu prefecture (since 13th of September 2018)] Tested (RT-PCR): 4,327 wild boars, Positive: 1,204 [Shizuoka prefecture (since 14th of September 2018)] Tested (RT-PCR): 2,240 wild boars, Positive: 240 [Aichi prefecture (since 14th of September 2018)] Tested (RT-PCR): 2,111 wild boars, Positive: 137 [Mie prefecture (since 14th of September 2018)] Tested (RT-PCR): 2,824 wild boars, Positive: 205 [Shiga prefecture (since 14th September 2018) Tested (RT-PCR): 982 wild boars, Positive: 221 [Kyoto prefecture (since 14th of September 2018)] Tested (RT-PCR): 188 wild boars, Positive: 4 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, Nagano, Nara, Niigata, Osaka, Okinawa, Saitama, Shiga, Shizuoka, Tochigi, Tokyo, Toyama, Wakayama, Yamagata, Yamanashi. 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 are 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
Gunma Livestock Hygene Service Centre (Local laboratory) Swine reverse transcription - polymerase chain reaction (RT-PCR) 26/09/2020 Positive
National Institute of Animal Health (OIE Reference Laboratory) Swine gene sequencing 26/09/2020 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations