Abstract

Bonamia ostreae in Canada.

OIE
OIE Disease Information (on-line)
17
50
2004
BONAMIA OSTREAE IN CANADA

( Disease never reported before in Canada ).

Emergency report
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.

Diagnosis:

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.

Epidemiological details:

The shellfish farm was investigated due to a heavy die off at the grower site in November 2004.

Control measures:

- 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
OIE