Infection with Gyrodactylus salaris,
Information received on 14/08/2015 from Dr Ingrid Eilertz, Chief Veterinary Officer Director and Head, Swedish Board of Agriculture Department for Animal Welfare and Health, Ministry for Rural Affairs, Jönköping, Sweden
Report type Immediate notification (Final report)
Date of start of the event 08/07/2015
Date of confirmation of the event 05/08/2015
Report date 14/08/2015
Date submitted to OIE 14/08/2015
Date event resolved 05/08/2015
Reason for notification Recurrence of a listed disease
Date of previous occurrence 12/2013
Manifestation of disease Sub-clinical infection
Causal agent Gyrodactylus salaris
Nature of diagnosis Laboratory (advanced)
This event pertains to a defined zone within the country
New outbreaks (1)
Outbreak 1 Gåsvarv, Älvdalen, Älvdalen, Dalarnas Län
Date of start of the outbreak 08/07/2015
Outbreak status Resolved (05/08/2015)
Epidemiological unit Farm
Water type Fresh water
Population type Farmed
Production system Semi-open
Affected animals
Species Morbidity Mortality Susceptible Cases Deaths Killed and disposed of Slaughtered
Rainbow trout (Onchorhyncus mykiss) 5 % 5 % 1 10
Affected population Ten dead fryes were analysed and one of them was positive for Gyrodactylus salaris.
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rainbow trout (Onchorhyncus mykiss) 1 10
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Rainbow trout (Onchorhyncus mykiss) ** ** ** **
*Removed from the susceptible population through death, destruction and/or slaughter
**Not calculated because of missing information
Source of the outbreak(s) or origin of infection
  • Unknown or inconclusive
Control measures
Measures applied
  • Movement control inside the country
  • 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
Norwegian Veterinary Institute (National laboratory) Rainbow trout (Onchorhyncus mykiss) nucleotide sequencing 05/08/2015 Positive
Norwegian Veterinary Institute (National laboratory) Rainbow trout (Onchorhyncus mykiss) polymerase chain reaction (PCR) 31/07/2015 Positive
Future Reporting
The event is resolved. No more reports will be submitted.
Map of outbreak locations