OIE: Highly pathogenic avian influenza, Laos

OIE: Highly pathogenic avian influenza, Laos
submited by kickingbird at Sep, 16, 2008 7:49 AM from OIE

Information received on 14/09/2008 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	27/08/2008
Date of first confirmation of the event	04/09/2008
Report date	14/09/2008
Date submitted to OIE	14/09/2008
Reason for notification	Reoccurrence of a listed disease
Date of previous occurrence	02/2008
Causal agent	Highly pathogenic avian influenza virus
Serotype	H5N1
Nature of diagnosis	Laboratory (basic), Laboratory (advanced)
This event pertains to	the whole country

New outbreaks

Summary of outbreaks

Total outbreaks: 2

Outbreak Location and Affected population

OUDOMXAY (Nalae village, Nalae village, Xay) : The positive flock was discovered due to back tracing from Nambak outbreak. A surveillance zone of 5-Km-radius was drawn around the suspected farm in Oudomxay, from where the positive ducklings in Nambak originated, even though no positive animals were found on that farm. Very low daily mortality (2%) was reported during disease investigation in one flock in Nalae village. This flock also originated from the same farm. Animals originated from the same farm as infected Nambak flock.
LUANGPRABANG (Fa village, Fa village, Nambak) : Ducklings in a small commercial unit within a village with backyard poultry. They were purchased on 20 August 2008 and started to die on 27 August 2008 (about 4% and then increasing to 10% per day). Farmer reported it to the district officer on 1 September. Samples were confirmed to be positive for HPAI H5N1 on 4 September 2008. The declaration of the CVO and the provincial governor was made on 5 September 2008. The infected flock was culled on 4 September 2008 and culling within the 1-Km-radius zone around the control zone started on 5 September 2008. Culling was presumably completed on 12 September 2008 (backyard poultry). Legal purchase and movement from a farm in other province where illegal import is suspected. Investigation on that farm is on-going.

Total animals affected

Species	Susceptible	Cases	Deaths	Destroyed	Slaughtered
Birds	6592	270	220	5225	0

Outbreak statistics

Species	Apparent morbidity rate	Apparent mortality rate	Apparent case fatality rate	Proportion susceptible animals lost*
Birds	4.10%	3.34%	81.48%	**

* 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

Introduction of new live animals
Legal movement of animals
Illegal movement of animals

Control measures

Measures applied	Stamping out Movement control inside the country Screening 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

National Animal Health Centre, Avian Influenza Laboratory (National laboratory)

Tests and results

Species	Test	Test date	Result
Birds	real-time PCR	11/09/2008	Positive
Birds	reverse transcription – polymerase chain reaction (RT-PCR)	04/09/2008	Positive

Future Reporting

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

See Also:

http://www.oie.int

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