Information received on 17/01/2021 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. 4
Date of start of the event
23/07/2020
Date of confirmation of the event
25/07/2020
Report date
17/01/2021
Date submitted to OIE
17/01/2021
Reason for notification
Recurrence of a listed disease
Date of previous occurrence
06/06/2020
Manifestation of disease
Clinical disease
Causal agent
Highly pathogenic avian influenza virus
Serotype
H5N1
Nature of diagnosis
Laboratory (advanced)
This event pertains to
a defined zone within the country
Related reports
Immediate notification (07/08/2020)
Follow-up report No. 1 (11/09/2020)
Follow-up report No. 2 (01/10/2020)
Follow-up report No. 3 (22/12/2020)
Follow-up report No. 4 (17/01/2021)
New outbreaks (6)

Outbreak 1
Dai Hai, Dai Hai, Ke Sach, Soc Trang
Date of start of the outbreak
31/08/2020
Outbreak status
Resolved (30/09/2020)
Epidemiological unit
Village
Affected animals
Species
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Birds
5600
828
350
5250
0
Outbreak 2
Ho Dac Kien, Ho Dac Kien, Chau Thanh, Soc Trang
Date of start of the outbreak
13/09/2020
Outbreak status
Resolved (13/10/2020)
Epidemiological unit
Village
Affected animals
Species
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Birds
604
150
50
554
0
Outbreak 3
Vinh Hau A, Vinh Hau A, Hoa Binh, Bac Lieu
Date of start of the outbreak
13/09/2020
Outbreak status
Resolved (13/10/2020)
Epidemiological unit
Village
Affected animals
Species
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Birds
700
85
50
650
0
Outbreak 4
Vinh Phu Dong, Vinh Phu Dong, Phuoc Long, Bac Lieu
Date of start of the outbreak
24/09/2020
Outbreak status
Resolved (24/10/2020)
Epidemiological unit
Village
Affected animals
Species
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Birds
300
45
14
286
0
Outbreak 5
Tan Trung, Tan Trung, Go Cong, Tien Giang
Date of start of the outbreak
12/10/2020
Outbreak status
Resolved (12/11/2020)
Epidemiological unit
Village
Affected animals
Species
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Birds
1000
330
120
880
0
Outbreak 6
Phuoc Tuy, Phuoc Tuy, Can Duoc, Long An
Date of start of the outbreak
31/12/2020
Outbreak status
Continuing (or date resolved not provided)
Epidemiological unit
Village
Affected animals
Species
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Birds
500
160
100
400
0
Summary of outbreaks
Total outbreaks: 6
Total animals affected
Species
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Birds
8704
1598
684
8020
0
Outbreak statistics
Species
Apparent morbidity rate
Apparent mortality rate
Apparent case fatality rate
Proportion susceptible animals lost*
Birds
18.36%
7.86%
42.80%
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

Control measures
Measures applied
Stamping out
Surveillance outside containment and/or protection zone
Vaccination in response to the outbreak (s)
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.