Information received on 23/12/2020 from Dr Hakan Henrikson, Chief Veterinary Officer, Swedish Board of Agriculture, Ministry of Enterprise and Innovation, J?nk?ping, Sweden
Summary
Report type
Follow-up report No. 4
Date of start of the event
01/11/2020
Date of confirmation of the event
26/11/2020
Report date
23/12/2020
Date submitted to OIE
23/12/2020
Reason for notification
Recurrence of a listed disease
Date of previous occurrence
06/05/2018
Manifestation of disease
Clinical disease
Causal agent
Highly pathogenic influenza A virus
Serotype
H5N8
Nature of diagnosis
Laboratory (advanced)
This event pertains to
the whole country
Related reports
Immediate notification (27/11/2020)
Follow-up report No. 1 (08/12/2020)
Follow-up report No. 2 (09/12/2020)
Follow-up report No. 3 (16/12/2020)
Follow-up report No. 4 (23/12/2020)
New outbreaks (3)

Outbreak 1
Malm?, Malm?, Malm?, Sk?ne L?n
Date of start of the outbreak
09/12/2020
Outbreak status
Resolved (09/12/2020)
Epidemiological unit
Backyard
Affected animals
Species
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Barnacle Goose:Branta leucopsis(Anatidae)

1
0
1
0
Affected population
A Barnacle goose (Branta leucopsis) was found with clinical signs of apathy and spastic movments and was for this reason euthanised. It was sent to the National Veterinary Institute for laboratory analysis as part of the national surveillance program for avian influenza. Laboratory testing with real-time PCR and virus sequencing was performed with a positive result for highly pathogenic avian influenza H5N8
Outbreak 2
Skurup, Skurup, Skurup, Sk?ne L?n
Date of start of the outbreak
15/12/2020
Outbreak status
Resolved (15/12/2020)
Epidemiological unit
Backyard
Affected animals
Species
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Barnacle Goose:Branta leucopsis(Anatidae)

1
1
0
0
Affected population
A Barnacle goose (Branta leucopsis) was found with clinical signs of apathy and later died. It was sent to the National Veterinary Institute for laboratory analysis as part of the national surveillance program for avian influenza. Laboratory testing with real-time PCR and virus sequencing was performed with a positive result for highly pathogenic avian influenza H5N8.
Outbreak 3
Svedala, Kl?gerup, Kl?gerup, Sk?ne L?n
Date of start of the outbreak
20/12/2020
Outbreak status
Resolved (23/12/2020)
Epidemiological unit
Backyard
Affected animals
Species
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Birds
30
20
20
10
0
Affected population
A hobby flock of 30 chickens kept in a backyard without roof coverage. 10 birds died initially, another 10 birds died before 23 december when the last 10 birds where euthanized.
Summary of outbreaks
Total outbreaks: 3
Total animals affected
Species
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Barnacle Goose:Branta leucopsis(Anatidae)

2
1
1
0
Birds
30
20
20
10
0
Outbreak statistics
Species
Apparent morbidity rate
Apparent mortality rate
Apparent case fatality rate
Proportion susceptible animals lost*
Barnacle Goose:Branta leucopsis(Anatidae)
**
**
50.00%
**
Birds
66.67%
66.67%
100.00%
100.00%
*Removed from the susceptible population through death, destruction and/or slaughter
**Not calculated because of missing information
Epidemiology
Source of the outbreak(s) or origin of infection
Contact with wild species
Epidemiological comments
In accordance with the OIE Terrestrial Animal Health Code, Article 10.4.1, point 8, this event does not change the disease free status of Sweden as these are wild birds, and therefore do not fall within the OIE definition of poultry. One outbreak in a small non-commercial hobby flock was dianosed 23 december. The flock was kept outdoor within a fenced area. The flock has been defined as a holding with birds other than poultry. Measures necessary in accordance with EU legislation, including stamping out, will immediately be applied in order to prevent any spread of avian influenza. The remaining birds were euthanised 23 December, which will be followed by sanitation measures. There has been no contact with other holdings

Control measures
Measures applied
Official destruction of animal products
Official disposal of carcasses, by-products and waste
Stamping out
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
National Veterinary Institute (National laboratory)
Birds
real-time PCR
21/12/2020
Positive
National Veterinary Institute (National laboratory)
Birds
virus neutralisation test (VNT)
23/12/2020
Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.