KOI HERPESVIRUS DISEASE IN JAPAN
( Disease never reported before in Japan ).
Information received on 20 November 2003 from Dr Masako Kurimoto, Director of Animal Health and Animal Products Safety Division, Ministry of Agriculture, Forestry and Fisheries, Tokyo:
Report date: 20 November 2003.
Date of initial detection of animal health incident: October 2003.
Location: Ibaraki prefecture. Subsequently, other cases of koi herpesvirus disease have been recognised among common carp in other parts of Japan.
No. of outbreaks: 1
Description of affected population: farmed common carp( Cyprinus carpio ).
Total number of animals in the outbreak: species - pis; deaths - about 1,190 tons.
Diagnosis: the clinical signs include severe gill necrosis and sunken eyes.
A. Laboratory where diagnosis was made: Aquatic Animal Health Division of the National Research Institute of Aquaculture.
B. Diagnostic tests used: the PCR(1) test described by Gilad et al. (2002) and Gray et al. (2002) was conducted and the disease was diagnosed as koi herpesvirus infection based on the sequence of specific PCR products.
C. Causal agent: koi herpesvirus.
A. Source of agent / origin of infection: under investigation.
B. Mode of spread: under investigation.
Control measures: the Governor of Ibaraki Prefecture has officially prohibited the movement of common carp from the affected areas to other areas.
(1) PCR: polymerase chain reaction