Influenza A subtype H1, Australia (WAHID Interface - OIE World Animal Health Information Database, July 31, 2009, edited)

[Giuseppe]

Influenza A subtype H1, Australia (WAHID Interface - OIE World Animal Health Information Database, July 31, 2009, edited)

Influenza A subtype H1, Australia

Information received on 31/07/2009 from Mr J. Gardner Murray, Delegate to OIE & President of the OIE Regional Commission for Asia, the Far East and Oceania, Office of the Chief Veterinary Officer , Australian Government Department of Agriculture, Fisheries and Forestry (AFFA) , CANBERRA, Australia

-- Summary
Report type Immediate notification
Start date 24/07/2009
Date of first confirmation of the event 31/07/2009
Report date 31/07/2009
Date submitted to OIE 31/07/2009
Reason for notification Emerging disease

• Morbidity 5 %
• Mortality 0 %

Zoonotic impact People associated with the piggery had shown influenza-like illness prior to this incident

Causal agent Influenza A H1 subtype
Serotype Pending
This event pertains to the whole country

-- New outbreaks
- Outbreak 1 - Central West New South Wales, NEW SOUTH WALES
Date of start of the outbreak 24/07/2009
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals: Species - Susceptible - Cases - Deaths - Destroyed - Slaughtered
- Swine - 1950 - 100 - 0 - 0 - 0
Affected population Integrated farrow-to-finish farm; finishers had mild cough, weaners less affected, no apparent disease in dry sows.

-- Summary of outbreaks
Total outbreaks: 1
Outbreak statistics: Species - Apparent morbidity rate - Apparent mortality rate - Apparent case fatality rate - Proportion susceptible animals lost*
- Swine - 5.13% - 0.00% - 0.00% - 0.00%
* Removed from the susceptible population through death, destruction and/or slaughter

-- Epidemiology
Source of the outbreak(s) or origin of infection
* Most likely, contact with people

-- Epidemiological comments
This is the first outbreak of influenza in swine in Australia.
The affected farm is isolated. It is a mixed farming operation, raising both cattle and sheep (separated from the piggery). There is no poultry nearby. There has been no introduction of live pigs for more than 2 years. The property has been placed under quarantine.
Disease has been very mild in affected pigs. 12 of 13 clinical cases sampled gave a positive result to the Influenza A matrix qPCR, with one indeterminate result. 9 of 13 animals gave a positive result to a H1 specific qPCR, with 4 indeterminate results.
Epidemiological investigations are continuing. Further work is under way to isolate virus and sequence PCR material.

-- Control measures
Measures applied
* Quarantine
* Movement control inside the country
* Vaccination prohibited
* No treatment of affected animals
Measures to be applied
* No other measures

-- Diagnostic test results
Laboratory name and type Elizabeth Macarthur Agricultural Institute (Local laboratory)
Tests and results: Species - Test - Test date - Result
- Swine - enzyme-linked immunosorbent assay (ELISA) - 31/07/2009 - Positive
- Swine - haemagglutination inhibition test (HIT) - 31/07/2009 - Positive
- Swine - real-time PCR - 31/07/2009 - Positive

Laboratory name and type Australian Animal Health Laboratory (National laboratory)
Tests and results: Species - Test - Test date - Result
- Swine - enzyme-linked immunosorbent assay (ELISA) - 31/07/2009 - Positive
- Swine - haemagglutination inhibition test (HIT) - 31/07/2009 - Positive
- Swine - real-time PCR - 31/07/2009 - Positive

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

<cite cite="http://www.oie.int/wahis/public.php?page=single_report&pop=1&reportid=8332">WAHID Interface - OIE World Animal Health Information Database</cite>