Bovine spongiform encephalopathy,
United States of America
Information received on 29/08/2018 from Dr John Clifford, Official Delegate, Chief Trade Advisor, Animal and Plant Health Inspection Service, United States Department of Agriculture, Washington, United States of America
Report type Immediate notification (Final report)
Date of start of the event 18/08/2018
Date of confirmation of the event 26/08/2018
Report date 29/08/2018
Date submitted to OIE 29/08/2018
Date event resolved 28/08/2018
Reason for notification Recurrence of a listed disease
Date of previous occurrence 19/07/2017
Manifestation of disease Clinical disease
Causal agent Prion (atypical H-type BSE)
Nature of diagnosis Laboratory (advanced)
This event pertains to a defined zone within the country
New outbreaks (1)
Outbreak 1 Marion County, Marion, Florida
Date of start of the outbreak 19/08/2018
Outbreak status Resolved (28/08/2018)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Cattle 1 1 1 0 0
Affected population Six year old beef type cow
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Cattle 1 1 1 0 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Cattle 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
  • Spontaneous mutation
Epidemiological comments As part of the United States’ targeted surveillance program for bovine spongiform encephalopathy (BSE), a case of atypical BSE was identified in a six year old beef type cow. This atypical BSE case was classified as H-type. In over 20 years of surveillance, the 5 native cases detected in the United States have all been atypical cases. The identified animal did not enter any food supply channels and at no time presented a risk to human health. Specified risk material removal and the ruminant-to-ruminant feed bans continue to be effectively applied.
Control measures
Measures applied
  • Screening
  • Traceability
  • Official disposal of carcasses, by-products and waste
  • 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 Veterinary Services Laboratories (NVSL) (National laboratory) Cattle enzyme-linked immunosorbent assay (ELISA) 26/08/2018 Positive
National Veterinary Services Laboratories (NVSL) (National laboratory) Cattle western blot 26/08/2018 Positive
Future Reporting
The event is resolved. No more reports will be submitted.
Map of outbreak locations