Porcine reproductive and respiratory syndrome, Laos

Information received on 06/07/2010 from Dr Khambounheuang Bounkhouang , Directeur Général, Département de l'Elevage et des Pêches , Ministère de l'Agriculture et des Forêts , Vientiane, Laos

Summary

New outbreaks

Outbreak 1	Ban Nahay, Hatxaifong, VIENTIANE CAPITAL
Date of start of the outbreak	21/06/2010
Outbreak status	Continuing (or date resolved not provided)
Epidemiological unit	Farm
Affected animals	Species Susceptible Cases Deaths Destroyed Slaughtered Swine 600 65 5 0 0
Affected Population	Since 21 June 2010, the animal health staff of the farm reported to the animal health officer of Vientiane Capital that some sows aborted and some pigs were sick. The farmer has given antibiotics to sick animals and some of them have become healthy but some still showed clinical signs. Eventually, the animal health staff of the farm submitted samples to the National Animal Health Centre for testing.
Outbreak 2	Ban Phao, Hatxaifong, VIENTIANE CAPITAL
Date of start of the outbreak	16/06/2010
Outbreak status	Continuing (or date resolved not provided)
Epidemiological unit	Farm
Affected animals	Species Susceptible Cases Deaths Destroyed Slaughtered Swine 190 80 43 0 0
Affected Population	A pig showing clinical signs was reported to the animal health officer in Vientiane Capital on 16 June 2010. Most of pregnant pigs aborted and some grower pigs showed coughing and died. The animal health officer treated them with antibiotics and some of the sick pigs recovered. Two severely affected pigs were submitted to the National Animal Health Centre for necropsy and samples were tested positive using real-time PCR.
Summary of outbreaks	Total outbreaks: 2
Total animals affected	Species Susceptible Cases Deaths Destroyed Slaughtered Swine 790 145 48 0 0
Outbreak statistics	Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost* Swine 18.35% 6.08% 33.10% 6.08% * Removed from the susceptible population through death, destruction and/or slaughter

Epidemiology

Source of the outbreak(s) or origin of infection	Unknown or inconclusive Introduction of new live animals
Epidemiological comments	The introduction of new live animals into the farm and low biosecurity of the farm are the likely source of the occurrence of the disease.

Control measures

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

Diagnostic test results

Laboratory name and type	National Animal Health Centre (National laboratory)
Tests and results	Species Test Test date Result Swine real-time PCR 02/07/2010 Positive

Future Reporting

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

Map of outbreak locations

Location of current outbreaks

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