Classical swine fever,
Japan
Information received on 06/02/2019 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. 15
Date of start of the event 03/09/2018
Date of confirmation of the event 09/09/2018
Report date 06/02/2019
Date submitted to OIE 06/02/2019
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)
New outbreaks (18)
Outbreak 1 Gifu City, Gifu
Date of start of the outbreak 25/01/2019
Outbreak status Resolved (25/01/2019)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Wild boar:Sus scrofa(Suidae) 1 0 1 0
Outbreak 2 Gifu City, Gifu
Date of start of the outbreak 25/01/2019
Outbreak status Resolved (25/01/2019)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Wild boar:Sus scrofa(Suidae) 1 0 1 0
Outbreak 3 Kani City, Gifu
Date of start of the outbreak 25/01/2019
Outbreak status Resolved (25/01/2019)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Wild boar:Sus scrofa(Suidae) 1 1 0 0
Outbreak 4 Inuyama City, Aichi
Date of start of the outbreak 27/01/2019
Outbreak status Resolved (27/01/2019)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Wild boar:Sus scrofa(Suidae) 1 0 1 0
Outbreak 5 Inuyama City, Aichi
Date of start of the outbreak 28/01/2019
Outbreak status Resolved (28/01/2019)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Wild boar:Sus scrofa(Suidae) 1 0 1 0
Outbreak 6 Minokamo City, Gifu
Date of start of the outbreak 29/01/2019
Outbreak status Resolved (29/01/2019)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Wild boar:Sus scrofa(Suidae) 1 0 1 0
Outbreak 7 Kakamigahara City, Gifu
Date of start of the outbreak 29/01/2019
Outbreak status Resolved (29/01/2019)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Wild boar:Sus scrofa(Suidae) 1 1 0 0
Outbreak 8 Motosu City, Gifu
Date of start of the outbreak 29/01/2019
Outbreak status Resolved (01/02/2019)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Swine 867 89 0 867 0
Outbreak 9 Kasugai City, Aichi
Date of start of the outbreak 30/01/2019
Outbreak status Resolved (30/01/2019)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Wild boar:Sus scrofa(Suidae) 1 0 1 0
Outbreak 10 Minokamo City, Gifu
Date of start of the outbreak 31/01/2019
Outbreak status Resolved (31/01/2019)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Wild boar:Sus scrofa(Suidae) 1 1 0 0
Outbreak 11 Yaotsu Town, Gifu
Date of start of the outbreak 31/01/2019
Outbreak status Resolved (31/01/2019)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Wild boar:Sus scrofa(Suidae) 1 0 1 0
Outbreak 12 Inuyama City, Aichi
Date of start of the outbreak 01/02/2019
Outbreak status Resolved (01/02/2019)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Wild boar:Sus scrofa(Suidae) 1 0 1 0
Outbreak 13 Toyota city, Aichi
Date of start of the outbreak 05/02/2019
Outbreak status Resolved (12/02/2019)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Swine 6640 5 0 6640 0
Outbreak 14 Tahara City, Aichi
Date of start of the outbreak 05/02/2019
Outbreak status Resolved (10/02/2019)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Swine 1600 5 0 1600 0
Outbreak 15 Miyada Village, Nagano
Date of start of the outbreak 05/02/2019
Outbreak status Resolved (08/02/2019)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Swine 2300 5 0 2300 0
Outbreak 16 Ena City, Gifu
Date of start of the outbreak 05/02/2019
Outbreak status Resolved (08/02/2019)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Swine 4000 5 0 4000 0
Outbreak 17 Ohmihachiman City, Shiga
Date of start of the outbreak 05/02/2019
Outbreak status Resolved (08/02/2019)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Swine 700 10 0 700 0
Outbreak 18 Higashi Osaka City, Osaka
Date of start of the outbreak 05/02/2019
Outbreak status Resolved (15/02/2019)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Swine 600 8 0 600 0
Summary of outbreaks Total outbreaks: 18
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Wild boar:Sus scrofa(Suidae) 11 3 8 0
Swine 16707 127 0 16707 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Wild boar:Sus scrofa(Suidae) ** ** 27.27% **
Swine 0.76% 0.00% 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. Epidemiologically related farm of the 7th affected farm (Motosu City in Gifu, 29/01/2019) On 17th Jan. 80 pigs were introduced into this farm from the 7th affected farm. On 29th Jan. official veterinarians of the Gifu Central Livestock Hygiene Service Centre (LHSC) visited the farm to conduct clinical inspection. Official veterinarians collected blood samples. The blood samples were tested for Classical Swine Fever (CSF) virus by RT-PCR at the Gifu Central LHSC and found to be positive on 30th Jan. Stamping out, and disinfection of contaminated materials and tools as well as inside of the farm were completed on 1st Feb. 2. 8th affected farm (Toyota city, Aichi, 05/02/2019) On 4th Feb. several pigs were found to have low appetite and reported to the Aichi Central LHSC. Official veterinarians of the LHSC immediately visited the farm to conduct clinical inspection and blood sampling. Official veterinarians conducted RT-PCR for CSF virus and found to be positive on 5th Feb. The National Institute of Animal Health (NIAH) carried out the sequencing analysis of the amplified products and the NIAH confirmed that this was a case of CSF on 6th Feb. Result of the sequencing analysis suggests that the virus of the 8th case is classified into the same phylogenetic cluster with those of the previous 7 cases and some wild boars captured in Gifu and Aichi. Movement and shipment restriction are imposed on the farms within a radius of 3km and 10km on the affected farm respectively. Stamping-out is being carried out on the affected farm. 3. Epidemiologically related farms of the 8th affected farm (Tahara city in Aichi, Iida city in Nagano, Ena city in Gifu, Ohmihachiman city in Shiga, and Higashi Osaka city in Osaka, 05/02/2019) Immediately after the confirmation of the 8th case in Aichi, epidemiologically related farms were identified. These farms have introduced piglet from the 8th affected farm. The official veterinarian of the LHSC of each prefecture visited the epidemiologically related farms and collected samples. RT-PCR for CSF virus were conducted at the LHSC in each prefecture and samples were found to be positive on 6th Feb. Stamping out of all pigs is being carried out in these farms. 4. Summary of the wild boar surveillance: As of the 4th Feb, 710 wild boars (79 dead and 631 captured) in Gifu prefecture have been tested and 112 (41 dead and 71 captured) were found to be positive for CSF by RT-PCR since 13th of September. 59 wild boars (14 dead and 45 captured) in Aichi prefecture have been tested and 10 were found to be positive (1 dead and 9 captured) for CSF by RT-PCR since 14th of September. Among the other prefectures, 161 dead wild boars in 36 prefectures were tested and all were found to be negative by RT-PCR since the 14th of September(*). (*): All prefectures are requested to conduct CSF testing on dead wild boars.
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 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) 05/02/2019 Positive
Aichi Central Livestock Hygiene Service Centre (Local laboratory) Swine reverse transcription - polymerase chain reaction (RT-PCR) 06/02/2019 Positive
Aichi Central Livestock Hygiene Service Centre (Local laboratory) Wild boar reverse transcription - polymerase chain reaction (RT-PCR) 29/01/2019 Positive
Aichi Central Livestock Hygiene Service Centre (Local laboratory) Wild boar reverse transcription - polymerase chain reaction (RT-PCR) 31/01/2019 Positive
Aichi Central Livestock Hygiene Service Centre (Local laboratory) Wild boar reverse transcription - polymerase chain reaction (RT-PCR) 03/02/2019 Positive
Gifu Central Livestock Hygiene Service Centr (Local laboratory) Swine reverse transcription - polymerase chain reaction (RT-PCR) 06/02/2019 Positive
Gifu Central Livestock Hygiene Service Centre (Local laboratory) Swine reverse transcription - polymerase chain reaction (RT-PCR) 30/01/2019 Positive
Gifu Central Livestock Hygiene Service Centre (Local laboratory) Wild boar reverse transcription - polymerase chain reaction (RT-PCR) 28/01/2019 Positive
Gifu Central Livestock Hygiene Service Centre (Local laboratory) Wild boar reverse transcription - polymerase chain reaction (RT-PCR) 31/01/2019 Positive
Gifu Central Livestock Hygiene Service Centre (Local laboratory) Wild boar reverse transcription - polymerase chain reaction (RT-PCR) 01/02/2019 Positive
Nagano Central Livestock Hygiene Service Centre (Local laboratory) Swine reverse transcription - polymerase chain reaction (RT-PCR) 06/02/2019 Positive
Osaka Central Livestock Hygiene Service Centre (Local laboratory) Swine reverse transcription - polymerase chain reaction (RT-PCR) 06/02/2019 Positive
Shiga Central Livestock Hygiene Service Centre (Local laboratory) Swine reverse transcription - polymerase chain reaction (RT-PCR) 06/02/2019 Positive
National Institute of Animal Health (OIE Reference Laboratory) Swine gene sequencing 06/02/2019 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations