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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
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Epidemiology
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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. |
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