Highly pathogenic avian influenza,
Vietnam
Information received on 12/08/2014 from Dr Dong Pham Van, Director General, Chief Veterinary Officer, Department of Animal Health, Ministry of Agriculture and Rural Development, Hanoļ, Vietnam
Summary
Report type Immediate notification
Date of start of the event 22/04/2014
Date of confirmation of the event 16/07/2014
Report date 12/08/2014
Date submitted to OIE 12/08/2014
Date event resolved 06/10/2014
Reason for notification New strain of a listed disease
Manifestation of disease Clinical disease
Causal agent Highly pathogenic avian influenza virus
Serotype H5N6
Nature of diagnosis Clinical, Laboratory (advanced)
This event pertains to a defined zone within the country
Related reports Immediate notification (12/08/2014)
Follow-up report No. 1 (22/08/2014)
Follow-up report No. 2 (04/09/2014)
Follow-up report No. 3 (20/09/2014)
Follow-up report No. 4 (22/10/2014)
New outbreaks (2)
Outbreak 1 Keo Quang, Chi Lang, Trang Dinh, Lang Son
Date of start of the outbreak 22/04/2014
Outbreak status Resolved (22/05/2014)
Epidemiological unit Village
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 80 40 15 65 0
Outbreak 2 Tan Son, Ky Tho, Ky Anh, Ha Tinh
Date of start of the outbreak 25/06/2014
Outbreak status Resolved (25/07/2014)
Epidemiological unit Village
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 1900 950 1900 0
Summary of outbreaks Total outbreaks: 2
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 1980 990 15 1965 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Birds 50.00% ** ** **
*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
  • Unknown or inconclusive
Epidemiological comments This is a new strain detected from outbreak surveillance activities. The initial result was positive for H5 but negative for N1. Therefore further testing was needed and the final result was only available in July 2014 (N6 positive). All poultry in affected flocks were destroyed immediately when poultry showing clinical signs of HPAI were detected. Samples were taken from surrounding poultry flocks. All were negative for avian influenza.
Control measures
Measures applied
  • Movement control inside the country
  • Screening
  • Disinfection / Disinfestation
  • Stamping out
  • Control of wildlife reservoirs
  • 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 Centre for Veterinary Diagnosis (NCVD) (National laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 16/07/2014 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations