SPRING VIRAEMIA OF CARP IN CANADA
( Disease never reported before in Canada ).
Immediate notification report
Information received on 28 September 2006 from Dr Brian Evans, Chief Veterinary Officer, Canadian Food Inspection Agency, Ottawa:
Report date: 27 September 2006.
Reason for immediate notification: first occurrence in a country previously considered to be free of that particular disease.
Identification of agent: spring viraemia of carp virus.
Date of first confirmation of the event: 13 September 2006.
Date of start of the event: 28 June 2006.
Clinical disease: no.
Nature of diagnosis: laboratory.
Details of occurrence:
First administrative division (province): Ontario; Type of epidemiological unit: lake; Name of the location: Hamilton harbour; Date of start of the occurrence: 28 June 2006; Species: pis; Number of animals in the occurrence: susceptible: 30; cases: 18*; deaths: 0; destroyed: 0; slaughtered: 0
* pooled samples
Location of the outbreak
Description of affected population: freshwater common carp( Cyprinus carpio )in an open production system. The population was spawning at time of collection and showed no clinical signs of the disease. The sample fish were collected in late June for screening prior to shipment of carp from this area to another country. Thirty pooled samples (5 fish in each sample) were collected at the same location and the virus was detected in 18 samples. The shipment was cancelled.
Laboratories where diagnostic tests were performed: a. Freshwater Institute, Canadian Department of Fisheries and Oceans / b. Pacific Biological Station, Canadian Department of Fisheries and Oceans / c. CEFAS(2) Weymouth Laboratory, United Kingdom (OIE reference laboratory); Species examined: a. pis / b. pis / c. pis; Diagnostic tests used: a. pathogen isolation on cell culture / b. PCR(1) / c. PCR; Dates: a. 23 July 2006 / b. 21 August 2006 / c. 13 September 2006; Results: a. doubtful / b. positive / c. positive
Source of occurrence or origin of infection: unknown or inconclusive.
Control measures to be undertaken:
- surveillance within containment and/or buffer zone;
- surveillance outside containment and/or buffer zone.
Treatment of affected animals: no.
Vaccination prohibited: no.
Other details/comments: Preliminary results at the CEFAS Weymouth Laboratory placed the Canadian isolate in spring viraemia of carp virus genogroup I a together with the Asian and U.S. isolates. Further investigations will be done to compare this isolate with others.
Final report: no.
(1) PCR: polymerase chain reaction
(2) CEFAS: Centre for Environment, Fisheries & Aquaculture