Bonamia ostrea in the United Kingdom/Great Britain. (Scotland)

OIE Disease Information (on-line)
See also: 25 May 2006

( Date of previous outbreak of Bonamia ostreae in the United Kingdom/Great Britain reported to the OIE: May 2006).

Immediate notification report

Information received on 13 July 2006 from Dr Debby Reynolds, Director General for Animal Health and Welfare, Department for Environment, Food and Rural Affairs (DEFRA), London:

Report date:
13 July 2006.

Reason for immediate notification:
first occurrence in a zone of the country.

Identification of agent: Bonamia ostreae

Host species:
flat oyster( Ostrea edulis ).

Date of first confirmation of the event:
30 June 2006.

Date of start of the event:
27 April 2006.

Clinical disease:

Nature of diagnosis:
basic and advanced laboratory tests.

Details of occurrence:

First administrative division:
Scotland; Lower administrative division (region): Highland; Type of epide-miolo-gical unit: farm; Name of the location: Loch Sunart; Latitude: 56䣒.29'N; Longitude: 5䣖.95'W; Date of start of the occurrence: 27 April 2006; Species: mol; Number of animals in the occurrence - susceptible: 300,699; cases: … deaths: … destroyed: … slaughtered: 0

Description of affected population:
open fallow farmed site.

Laboratories where diagnostic tests were performed:
Fisheries Research Services, Aberdeen (national reference laboratory) / French Recherche Institute for Exploitation of the Sea (IFREMER), La Tremblade (EU reference laboratory); Species examined: mol / mol; Diagnostic tests used: histology / histology and in situ hybridisation; Date: 12 June 2006 / 30 June 2006; Results:

Source of occurrence or origin of infection:
unknown or inconclusive.

Control measures
A. Undertaken:

- emergency harvest;
- surveillance outside containment and/or buffer zone;
- zoning;
- within-country movement controls.

B. To be undertaken:

- tracing back;
- surveillance within containment and/or buffer zone.

Treatment of affected animals:

Other details/comments:

The site encompasses a small area of the sea bed, exposed only at low spring tide, on which post graded Ostrea edulis , too small for market, have been relaid. The site is considered as fallow, following inspection on 16 June 2006 when 31 Ostrea edulis were removed and tested.
On the first low water spring tide, the area is to be raked and searched for any remaining oysters. In addition, a diver is to search sublittorally for the presence of any which may have migrated from the designated area.
Anecdotal evidence suggests no wild populations of native oysters in the loch. However, investigations will be made to confirm this. If any are found they will be tested for Bonamia .

Final report: