Infection with Marteilia refringens,
United Kingdom
Information received on 17/05/2017 from Dr Nigel Gibbens, Chief Veterinary Officer, Department for Environment, Food and Rural Affairs, Department for Environment, Food and Rural Affairs, LONDON, United Kingdom
Summary
Report type Immediate notification (Final report)
Date of start of the event 06/12/2016
Date of confirmation of the event 11/04/2017
Report date 17/05/2017
Date submitted to OIE 17/05/2017
Date event resolved 17/05/2017
Reason for notification First occurrence of a listed disease
Manifestation of disease Sub-clinical infection
Causal agent Marteilia refringens
Nature of diagnosis Laboratory (basic), Laboratory (advanced)
This event pertains to a defined zone within the country
New outbreaks (2)
Outbreak 1 (Merteilia in Dundrum Bay) Dundrum Bay, NORTHERN IRELAND
Date of start of the outbreak 06/12/2016
Outbreak status Resolved (17/05/2017)
Epidemiological unit Coastal area
Water type Salt water
Population type Farmed
Production system Open
Affected animals
Species Morbidity Mortality Susceptible Cases Deaths Killed and disposed of Slaughtered
Blue mussel (Mytilus edulis) (kg) 1 (scale 0 to 5) 1 (scale 0 to 5) 4000 0 0
Affected population The presence of Marteilia refringens was identified during routine testing. There are no clinical signs. The affected area is under confirmed designation notice and movement restrictions are in place to prevent export to disease free areas.
Outbreak 2 ( Marteilia in Belfast Lough) Belfast Lough, NORTHERN IRELAND
Date of start of the outbreak 21/02/2017
Outbreak status Resolved (17/05/2017)
Epidemiological unit Coastal area
Water type Salt water
Population type Farmed
Production system Open
Affected animals
Species Morbidity Mortality Susceptible Cases Deaths Killed and disposed of Slaughtered
Blue mussel (Mytilus edulis) (kg) 1 (scale 0 to 5) 1 (scale 0 to 5) 10000 0 0
Affected population The presence of Marteilia refringens was identified during routine testing. There are no clinical signs or mortalities. The affected area is under confirmed designation notice and movement restrictions are in place to prevent export to disease free areas.
Summary of outbreaks Total outbreaks: 2
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Blue mussel (Mytilus edulis) (kg) 14000 ** 0 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Blue mussel (Mytilus edulis) (kg) ** ** ** **
*Removed from the susceptible population through death, destruction and/or slaughter
**Not calculated because of missing information
Epidemiology
Source of the outbreak(s) or origin of infection
  • Unknown or inconclusive
Epidemiological comments Movement controls are in place and health certificates will be updated to reflect change in disease status in the affected areas.
Control measures
Measures applied
  • Movement control inside the country
  • Traceability
  • Vaccination permitted (if a vaccine exists)
  • No treatment of affected animals
Measures to be applied
  • No other measures
Diagnostic test results
Laboratory name and type Species Test Test date Result
French Research Institute for Exploitation of the Sea (IFREMER), France, EU Reference Laboratory (Foreign laboratory) Blue mussel (Mytilus edulis) histological test 21/02/2017 Positive
French Research Institute for Exploitation of the Sea (IFREMER), France, EU Reference Laboratory (Foreign laboratory) Blue mussel (Mytilus edulis) in situ hybridisation (ISH) 07/03/2017 Positive
French Research Institute for Exploitation of the Sea (IFREMER), France, EU Reference Laboratory (Foreign laboratory) Blue mussel (Mytilus edulis) nucleotide sequencing 11/04/2017 Positive
French Research Institute for Exploitation of the Sea (IFREMER), France, EU Reference Laboratory (Foreign laboratory) Blue mussel (Mytilus edulis) real-time PCR 21/02/2017 Positive
AFBI (Agri-Food and Biosciences Institute), Belfast (Regional Laboratory) Blue mussel (Mytilus edulis) real-time PCR 06/12/2016 Positive
AFBI (Agri-Food and Biosciences Institute), Belfast (Regional Laboratory) Blue mussel (Mytilus edulis) real-time PCR 08/03/2017 Positive
AFBI (Agri-Food and Biosciences Institute), Belfast (Regional Laboratory) Blue mussel (Mytilus edulis) histological test 05/04/2017 Negative
Future Reporting
The event is resolved. No more reports will be submitted.
Map of outbreak locations