OIE: Highly pathogenic avian influenza, Laos

Information received on 14/05/2010 from Dr Khambounheuang Bounkhouang , Directeur Général, Département de l´Elevage et des Pêches , Ministère de l´Agriculture et des Forêts , Vientiane, Laos

Summary

Report type	Immediate notification
Start date	27/04/2010
Date of first confirmation of the event	06/05/2010
Report date	14/05/2010
Date submitted to OIE	14/05/2010
Reason for notification	Reoccurrence of a listed disease
Date of previous occurrence	04/04/2009
Manifestation of disease	Clinical disease
Causal agent	Highly pathogenic avian influenza virus
Serotype	H5N1
Nature of diagnosis	Clinical, Laboratory (basic), Necropsy
This event pertains to	the whole country

New outbreaks

Summary of outbreaks

Total outbreaks: 1

Location(s)

VIENTIANE CAPITAL (Latkhouay Farm, Xaythany )

Total animals affected

Species	Susceptible	Cases	Deaths	Destroyed	Slaughtered
Birds	1004	44	44	960	0

Outbreak statistics

Species	Apparent morbidity rate	Apparent mortality rate	Apparent case fatality rate	Proportion susceptible animals lost*
Birds	4.38%	4.38%	100.00%	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

The layers started to show clinical signs on 27 April 2010 and from 28 to 29 April 2010 two layers died. The first two dead poultry were submitted to the National Avian Influenza Laboratory. At the laboratory, necropsy of the two whole carcasses was performed as well as rapid test to detect influenza A and H5; results were slightly positive for avian influenza. Movement control measures of poultry and poultry products were effective.
>From 1 to 5 May 2010, the mortality of the poultry increased drastically in the farm and the farmer sent some more whole carcasses to the laboratory. The samples were tested using rapid test and were positive for influenza A and H5. On 6 May 2010, the samples were retested for confirmation using real-time PCR and results were positive for highly pathogenic avian influenza H5N1.
Actions for containing the spread of the infection were applied such as culling of infected and potentially infected poultry and disinfection of the premises; both were completed on 7 May 2010. Active and passive surveillances are on-going within 5 km radius around the infected farm. In addition, movement control is also effective.

Control measures

Measures applied	Stamping out Movement control inside the country Screening Zoning Disinfection of infected premises/establishment(s) Vaccination prohibited No treatment of affected animals
Measures to be applied	No other measures

Diagnostic test results

Laboratory name and type

Avian Influenza Laboratory at the National Animal Health Centre (National laboratory)

Tests and results

Species	Test	Test date	Result
Birds	real-time PCR	06/05/2010	Positive

Future Reporting

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