Classical swine fever,
Japan

Information received on 09/09/2018 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	Immediate notification
Date of start of the event	03/09/2018
Date of confirmation of the event	09/09/2018
Report date	09/09/2018
Date submitted to OIE	09/09/2018
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)

New outbreaks (1)

Outbreak 1

Gifu City, Gifu

Date of start of the outbreak

03/09/2018

Outbreak status

Resolved (11/09/2018)

Epidemiological unit

Farm

Affected animals

Species	Susceptible	Cases	Deaths	Killed and disposed of	Slaughtered
Swine	610	29	29	581	0

Affected population

Cases: one breeding sow, 26 fattening pigs and two suckling pigs.

Summary of outbreaks

Total outbreaks: 1

Total animals affected

Species	Susceptible	Cases	Deaths	Killed and disposed of	Slaughtered
Swine	610	29	29	581	0

Outbreak statistics

Species	Apparent morbidity rate	Apparent mortality rate	Apparent case fatality rate	Proportion susceptible animals lost*
Swine	4.75%	4.75%	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

On 3rd September, fattening pigs were found dead and reported to Gifu Central Livestock Hygiene Service Centre (LHSC) by a veterinarian. On 8th September, the samples derived from pigs of reported farm tested positive for Pestivirus by RT-PCR. But the result of pestivirus specific FAT was negative. On the same day, the National Institute of Animal Health (NIAH) carried out CSFV specific RT-PCR and FAT to samples transported from Gifu City, and the result were positive and negative respectively. On 9th September, sequencing analysis of the virus RNA was completed and the NIAH confirmed that this is the case of classical swine fever. Note: Possibility of a case of African swine fever was denied by NIAH. Movement and shipment restrictions are imposed on the hog farms within a radius of 3 km and 3-10 km of the affected farm respectively. Stamping-out is being carried out on the affected farm.

Control measures

Measures applied	Movement control inside the country 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
Gifu Central Livestock Hygiene Service Centre (Local laboratory)	Swine	direct fluorescent antibody (FAT) test	08/09/2018	Negative
Gifu Central Livestock Hygiene Service Centre (Local laboratory)	Swine	reverse transcription - polymerase chain reaction (RT-PCR)	08/09/2018	Positive
National Institute of Animal Health (OIE Reference Laboratory)	Swine	direct fluorescent antibody (FAT) test	08/09/2018	Negative
National Institute of Animal Health (OIE Reference Laboratory)	Swine	reverse transcription - polymerase chain reaction (RT-PCR)	08/09/2018	Positive
National Institute of Animal Health (OIE Reference Laboratory)	Swine	virus sequencing	09/09/2018	Positive

Future Reporting

The event is continuing. Weekly follow-up reports will be submitted.

Map of outbreak locations