Highly pathogenic avian influenza,
Vietnam

Information received on 27/11/2008 from Mr Bui Quang Anh, Chief Veterinary Officer, Department of Animal Health, Ministry of Agriculture and Rural Development, HANOI, Vietnam

Summary

Report type Follow-up report No. 22
Start date 07/12/2006
Date of first confirmation of the event 19/12/2006
Report date 27/11/2008
Date submitted to OIE 27/11/2008
Reason for notification Reoccurrence of a listed disease
Date of previous occurrence 10/08/2006
Manifestation of disease Clinical disease
Causal agent Highly pathogenic avian influenza virus
Serotype H5N1
Nature of diagnosis Clinical, Laboratory (basic), Laboratory (advanced)
This event pertains to a defined zone within the country
Related reports

New outbreaks
Outbreak 1 Quynh Chau, Quynh Chao, Quynh Luu, NGHE AN
Date of start of the outbreak 24/09/2008
Outbreak status Resolved (16/10/2008)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Destroyed Slaughtered
Birds 960 350 300 660 0
Affected Population an unvaccinated village duck flock.
Outbreak 2 Hong Thinh, Dien Hong, Dien Chau, NGHE AN
Date of start of the outbreak 30/10/2008
Outbreak status Resolved (21/11/2008)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Destroyed Slaughtered
Birds 1423 1400 1156 267 0
Affected Population The introduction of unvaccinated young ducklings into an existing flock was determined as the cause of the outbreak.
Summary of outbreaks Total outbreaks: 2
Total animals affected
Species Susceptible Cases Deaths Destroyed Slaughtered
Birds 2383 1750 1456 927 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Birds 73.44% 61.10% 83.20% 100.00%

* Removed from the susceptible population through death, destruction and/or slaughter

Epidemiology
Source of the outbreak(s) or origin of infection
  • Introduction of new live animals
  • Illegal movement of animals
  • Fomites (humans, vehicles, feed, etc.)

Control measures
Measures applied
  • Quarantine
  • Movement control inside the country
  • Disinfection of infected premises/establishment(s)
  • Modified stamping out
  • No vaccination
  • No treatment of affected animals
Measures to be applied
  • Screening
  • Zoning
  • Vaccination in response to the outbreak (s)

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

Map of outbreak locations
Location of current outbreaks

Click on map to zoom in.