Bluetongue,
Croatia
Information received on 21/12/2020 from Dr Tatjana Karačić, Assistant Minister, Chief Veterinary Officer, Veterinary Services, Ministry of Agriculture, Zagreb, Croatia
Summary
Report type Follow-up report No. 6
Date of start of the event 06/10/2020
Date of confirmation of the event 18/12/2020
Report date 21/12/2020
Date submitted to OIE 21/12/2020
Reason for notification Recurrence of a listed disease
Date of previous occurrence 01/06/2017
Manifestation of disease Sub-clinical infection
Causal agent Bluetongue virus
Serotype 4
Nature of diagnosis Laboratory (basic), Laboratory (advanced)
This event pertains to the whole country
Related reports Immediate notification (16/10/2020)
Follow-up report No. 1 (28/10/2020)
Follow-up report No. 2 (05/11/2020)
Follow-up report No. 3 (27/11/2020)
Follow-up report No. 4 (03/12/2020)
Follow-up report No. 5 (14/12/2020)
Follow-up report No. 6 (21/12/2020)
New outbreaks (6)
Outbreak 1 Boljunsko Polje, Boljunsko Polje, Lupoglav, Istarska
Date of start of the outbreak 01/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Cattle 109 1
Outbreak 2 Polje Cepic, Polje Cepic, Krsan, Istarska
Date of start of the outbreak 01/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Cattle 1125 1
Outbreak 3 Buroli, Buroli, Buje, Istarska
Date of start of the outbreak 01/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Cattle 113 1
Outbreak 4 Ciritez, Ciritez, Buzet, Istarska
Date of start of the outbreak 05/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Cattle 12 1
Outbreak 5 Ozdakovci, Ozdakovci, Velika, Pozesko-Slavonska
Date of start of the outbreak 07/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Cattle 84 1
Outbreak 6 Glusci, Glusci, Metkovic, Dubrovacko-Neretvanska
Date of start of the outbreak 14/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Cattle 20
Sheep 25 1
Summary of outbreaks Total outbreaks: 6
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Cattle 1463 5 **
Sheep 25 1
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Cattle ** ** ** **
Sheep 4.00% ** ** **
*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 In the framework of active surveillance, bluetongue (serotype 4) is confirmed by RT-PCR in 48 non-vaccinated cattle originating from 34 different holdings in Istria, Dubrovnik-Neretva and Pozesko-Slavonska county. In Dubrovnik-Neretva county, bluetongue (serotype 4) is confirmed on three holdings in two sheep with clinical signs and one sheep without clinical signs.
Control measures
Measures applied
  • Vaccination permitted (if a vaccine exists)
  • No treatment of affected animals
Measures to be applied
  • Disinfection
  • Vector surveillance
Diagnostic test results
Laboratory name and type Species Test Test date Result
Croatian Veterinary Institute (National laboratory) Cattle real-time PCR 18/12/2020 Positive
Croatian Veterinary Institute (National laboratory) Sheep real-time PCR 18/12/2020 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations