Infection with ostreid herpesvirus-1 microvariant,
Information received on 18/11/2014 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 12/09/2014
Date of confirmation of the event 10/11/2014
Report date 18/11/2014
Date submitted to OIE 18/11/2014
Date event resolved 14/11/2014
Reason for notification First occurrence of a listed disease
Manifestation of disease Clinical disease
Causal agent Ostreid herpesvirus-1 microvariant
Nature of diagnosis Laboratory (advanced)
This event pertains to the whole country
New outbreaks (1)
Outbreak 1 Hamnevägen 38, Sydkoster, Strömstad, Västra Götalands Län
Date of start of the outbreak 12/09/2014
Outbreak status Resolved (14/11/2014)
Epidemiological unit Farm
Water type Salt water
Population type Farmed
Production system Closed
Affected animals
Species Morbidity Mortality Susceptible Cases Deaths Killed and disposed of Slaughtered
Pacific oyster (Crassostrea gigas) 5 (scale 0 to 5) 5 (scale 0 to 5) 15000000 15000000 15000000 0 0
Affected population The affected population consisted of oyster larvae and oysters.
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Pacific oyster (Crassostrea gigas) 15000000 15000000 15000000 0 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Pacific oyster (Crassostrea gigas) 100.00% 100.00% 100.00% 100.00%
*Removed from the susceptible population through death, destruction and/or slaughter
Source of the outbreak(s) or origin of infection
  • Unknown or inconclusive
Epidemiological comments Note by the OIE World Animal Health Information and Analysis Department: Since this is the first time that the infection with ostreid herpesvirus-1 microvariant is identified in the history of the country, the reason for notification as first occurrence applies to the country but the event is in fact limited to a zone.
Control measures
Measures applied
  • Disinfection / Disinfestation
  • Stamping out
  • 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
National Veterinary Institute (National laboratory) Pacific oyster (Crassostrea gigas) real-time PCR 10/11/2014 Positive
National Veterinary Institute (National laboratory) Pacific oyster (Crassostrea gigas) virus sequencing 12/11/2014 Positive
Future Reporting
The event is resolved. No more reports will be submitted.
Map of outbreak locations