BONAMIA OSTREAE IN CANADA
( Disease never reported before in Canada ).
Information received on 9 December 2004 from Dr Brian Evans, Executive Director, Canadian Food Inspection Agency, Ottawa:
Date of the report: 9 December 2004.
Nature of diagnosis: laboratory.
Date of initial detection of animal health incident: 7 November 2004.
Estimated date of primary infection: under investigation.
Outbreaks: Location: Province of British Columbia, Malaspina Inlet (on the west coast of the mainland). No. of outbreaks: 1 shellfish farm
Description of affected population: 3- to 4-year-old oysters.
On 4 December 2004, Fisheries and Oceans Canada - Shellfish Health Laboratory in Nanaimo, reported the histological observation of the parasite in tissue samples. Based on further analysis by PCR(1) assays, gene sequencing and restriction digest (RFLP), a diagnosis of the suspicion of Bonamia was made.
This finding was confirmed by the OIE Reference Laboratory for diseases of molluscs, IFREMER, in La Tremblade, France.
Source of agent / origin of infection: under investigation.
The shellfish farm was investigated due to a heavy die off at the grower site in November 2004.
- Plans to control the spread of the disease are ongoing.
- Quarantine (except for direct human consumption).
- The industry and provincial veterinary organisations are being informed and a surveillance programme enhanced to ensure early detection.
(1) PCR: polymerase chain reaction