Highly pathogenic avian influenza,
United Kingdom
Information received on 18/12/2020 from Dr Christine Middlemiss, Chief Veterinary Officer, DEFRA, Department for Environment,Food and Rural Affairs , London, United Kingdom
Report type Immediate notification
Date of start of the event 13/12/2020
Date of confirmation of the event 18/12/2020
Report date 18/12/2020
Date submitted to OIE 18/12/2020
Reason for notification New strain of a listed disease in the country
Causal agent Highly pathogenic avian influenza virus
Serotype H5N1
Nature of diagnosis Laboratory (basic), Laboratory (advanced)
This event pertains to a defined zone within the country
Related reports Immediate notification (18/12/2020)
Follow-up report No. 1 (22/12/2020)
New outbreaks (1)
Outbreak 1 (AIV 2020/12) Nr Hawes, Richmond, England
Date of start of the outbreak 13/12/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 20 17 17 3 0
Affected population Backyard flock
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 20 17 17 3 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Birds 85.00% 85.00% 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
Epidemiological comments Ongoing Epidemiological investigation. Initial presumption indicates that this HPAI H5N1 virus belongs to the B clade. This clade has acquired gene segments from low pathogenic viruses and is not related to A(H5N1) viruses of e.g. clade causing human infections outside of Europe. Further tests are being carried out to confirm.
Control measures
Measures applied
  • Movement control inside the country
  • Surveillance outside containment and/or protection zone
  • Surveillance within containment and/or protection zone
  • Official disposal of carcasses, by-products and waste
  • Stamping out
  • Zoning
  • Vaccination prohibited
  • No treatment of affected animals
Measures to be applied
  • Traceability
  • Disinfection
Diagnostic test results
Laboratory name and type Species Test Test date Result
Weybridge (OIE Reference Laboratory) Birds gene sequencing 18/12/2020 Positive
Weybridge (OIE Reference Laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 17/12/2020 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations