Information received on 18/12/2020 from Dr Christine Middlemiss, Chief Veterinary Officer, DEFRA, Department for Environment,Food and Rural Affairs , London, United Kingdom
Summary
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
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
Epidemiology
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 2.3.4.4 B clade. This clade has acquired gene segments from low pathogenic viruses and is not related to A(H5N1) viruses of e.g. clade 2.3.2.1c 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.