Crayfish plague (Aphanomyces astaci),
Information received on 01/10/2020 from Dr Silvio Borrello, Chief Veterinary Officer, Food Safety and Collegial Bodies for Health Protection, Ministère de la Santé, Department for Veterinary Public Health, Rome, Italy
Report type Immediate notification (Final report)
Date of start of the event 18/08/2020
Date of confirmation of the event 02/09/2020
Report date 01/10/2020
Date submitted to OIE 01/10/2020
Date event resolved 02/09/2020
Reason for notification Recurrence of a listed disease
Date of previous occurrence 16/11/2018
Manifestation of disease Clinical disease
Causal agent Aphanomyces astaci
Nature of diagnosis Laboratory (advanced), Necropsy
This event pertains to a defined zone within the country
New outbreaks (1)
Date of start of the outbreak 18/08/2020
Outbreak status Resolved (02/09/2020)
Epidemiological unit River system
Water type Fresh water
Population type Wild
Production system Open
Affected animals
Species Morbidity Mortality Susceptible Cases Deaths Killed and disposed of Slaughtered
European freshwater crayfish (Austropotamobius pal (kg) 0 % 0 % 10 10 0 0
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
European freshwater crayfish (Austropotamobius pal (kg) 10 10 0 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
European freshwater crayfish (Austropotamobius pal (kg) ** ** 100.00% **
*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
Epidemiological comments More than seven hundred dead crayfishes of all ages were found in the bed of a river along two hundred meters. Death only affected this shrimp species.
Control measures
Measures applied
  • 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
Experimental Zooprophylactic Institute (IZS), Padova (National laboratory) European freshwater crayfish (Austropotamobius pallipes) polymerase chain reaction (PCR) 02/09/2020 Positive
Future Reporting
The event is resolved. No more reports will be submitted.
Map of outbreak locations