Information received on 20/12/2020 from Dr Dong Pham Van, Director General, Chief Veterinary Officer, Department of Animal Health, Ministry of Agriculture and Rural Development, Hano?, Vietnam
Summary
Report type
Follow-up report No. 2
Date of start of the event
21/08/2020
Date of confirmation of the event
31/08/2020
Report date
20/12/2020
Date submitted to OIE
20/12/2020
Reason for notification
Recurrence of a listed disease
Date of previous occurrence
29/07/2020
Manifestation of disease
Clinical disease
Causal agent
Highly pathogenic avian influenza virus
Serotype
H5N6
Nature of diagnosis
Laboratory (advanced)
This event pertains to
a defined zone within the country
Related reports
Immediate notification (11/09/2020)
Follow-up report No. 1 (01/10/2020)
Follow-up report No. 2 (20/12/2020)
New outbreaks (3)

Outbreak 1
Thuy Phong, Thuy Phong, Thai Thuy, Thai Binh
Date of start of the outbreak
26/09/2020
Outbreak status
Resolved (26/10/2020)
Epidemiological unit
Village
Affected animals
Species
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Birds
2198
1500
802
1396
0
Outbreak 2
Dien Dien, Dien Dien, Dien Khanh, Khanh Hoa
Date of start of the outbreak
21/11/2020
Outbreak status
Continuing (or date resolved not provided)
Epidemiological unit
Village
Affected animals
Species
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Birds
1167
100
50
1117
0
Outbreak 3
Dien Trung, Dien Trung, Dien Chau, Nghe An
Date of start of the outbreak
09/12/2020
Outbreak status
Continuing (or date resolved not provided)
Epidemiological unit
Village
Affected animals
Species
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Birds
7000
500
100
6900
0
Summary of outbreaks
Total outbreaks: 3
Total animals affected
Species
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Birds
10365
2100
952
9413
0
Outbreak statistics
Species
Apparent morbidity rate
Apparent mortality rate
Apparent case fatality rate
Proportion susceptible animals lost*
Birds
20.26%
9.18%
45.33%
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
Vaccination was only applied for the live poultry in surrounding areas of affected flocks.

Control measures
Measures applied
Vaccination in response to the outbreak (s)
Surveillance outside containment and/or protection zone
Stamping out
No treatment of affected animals
Measures to be applied
No other measures

Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.