Bovine spongiform encephalopathy,
Information received on 05/02/2020 from Mr Hans Wyss, Chief Veterinary Officer, Schwarzenburgstrasse 161, Swiss Federal Veterinary Office, LIEBEFELD BERNE, Switzerland
Report type Immediate notification (Final report)
Date of start of the event 29/01/2020
Date of confirmation of the event 03/02/2020
Report date 05/02/2020
Date submitted to OIE 05/02/2020
Date event resolved 03/02/2020
Reason for notification Recurrence of a listed disease
Date of previous occurrence 03/2012
Manifestation of disease Clinical disease
Causal agent Prion (atypical BSE type L)
Nature of diagnosis Laboratory (advanced)
This event pertains to the whole country
New outbreaks (1)
Outbreak 1 Einsiedeln, Schwyz
Date of start of the outbreak 29/01/2020
Outbreak status Resolved (03/02/2020)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Cattle 68 1 0 0 1
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Cattle 68 1 0 0 1
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Cattle 1.47% 0.00% 0.00% 1.47%
*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 Confirmation of atypical Bovine spongiform encephalopathy (BSE) in a cow on 3 February 2020. The 13 year old cow from a holding in the Canton of Schwyz was subject to emergency-slaughter on 23 January 2020. Samples of the brain stem were sent in for analysis and confirmed at the Swiss National Reference Laboratory for Transmissible Spongiform Encephalopathies. The sample tested positive in the rapid test for BSE "Priostrip BSE" and was confirmed by Western lmmunoblot. The pathological prion protein could be classified as (L) -Type BSE and therefore as an atypical case of BSE. The entire carcass was disposed of as category 1 material.
Control measures
Measures applied
  • Vaccination prohibited
  • 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 Reference Laboratory (National laboratory) Cattle western blot 03/02/2020 Positive
Future Reporting
The event is resolved. No more reports will be submitted.
Map of outbreak locations