Bovine spongiform encephalopathy,
Information received on 07/01/2021 from Dr Valentín Almansa, Director General, Sanidad de la Produccion Agraria, Ministerio de Agricultura, Pesca y Alimentación, Madrid, Spain
Report type Immediate notification (Final report)
Date of start of the event 21/12/2020
Date of confirmation of the event 23/12/2020
Report date 07/01/2021
Date submitted to OIE 07/01/2021
Date event resolved 23/12/2020
Reason for notification Recurrence of a listed disease
Date of previous occurrence 10/07/2019
Manifestation of disease Sub-clinical infection
Causal agent Prion (atypical BSE type H)
Nature of diagnosis Laboratory (advanced)
This event pertains to a defined zone within the country
New outbreaks (1)
Outbreak 1 Viniegra de Arriba, La Rioja
Date of start of the outbreak 21/12/2020
Outbreak status Resolved (23/12/2020)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Cattle 353 1 1 0 0
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Cattle 353 1 1 0 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Cattle 0.28% 0.28% 100.00% 0.28%
*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 On 22 December 2020, the Central Veterinary Laboratory in Algete, Madrid (National Reference Laboratory for TSEs, accredited under UNE-EN ISO/IEC 17025 standard) received a nerve tissue sample suspected to be infected by bovine spongiform encephalopathy (BSE) from the Regional Laboratory for Animal Health in La Rioja, Finca “La Grajera” (official regional laboratory), after a positive result was obtained through a HerdCheck BSE Antigen Test Kit (Idexx Laboratories) rapid test. The National Reference Laboratory carried out the confirmation tests authorized according to EU Regulation No. 1148/2014. The selected test was the BioRad inmuno-blotting TeSeE Western Blot (Ref:3551169), with a positive result. Afterwards, tests for BSE strain discrimination were carried out through hybrid immunoblotting with antibodies against PrP, confirming atypical BSE (H type strain). The sample was taken within the national TSE surveillance program (sampling of dead or non-slaughtered for human consumption animals over 48 months old). The animal was a crossbred cow born on April 20th 2003.
Control measures
Measures applied
  • Traceability
  • Official destruction of animal products
  • Official disposal of carcasses, by-products and waste
  • Selective killing and disposal
  • Disinfection
  • 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
Central Veterinary Laboratory in Algete (National laboratory) Cattle western blot 23/12/2020 Positive
Future Reporting
The event is resolved. No more reports will be submitted.
Map of outbreak locations