Ovine Johnes Disease Prevalence Areas
Note Number: AG1125
Published: January 2006
Updated: December 2010
This Agriculture Note describes OJD Prevalence Areas and how prevalence area influences a flock’s ABC score. Under the Assurance Based Credit (ABC) Scheme for OJD, every state in Australia has been assigned one or more Prevalence Areas. Prevalence Areas are based on the estimated percentage of flocks affected by OJD in the area.
What are the Prevalence Areas?
There are three different Prevalence Areas nationally. These are:
- High Prevalence (more than 12.5% of flocks infected)
- Medium Prevalence (0.8-12.5% of flocks infected), and
- Low Prevalence (less than 0.8% of flocks infected).
How are Prevalence Areas defined?
Prevalence Areas are determined and monitored nationally based on the results of abattoir monitoring and the number of known infected flocks in the area.
Fig 1: Australian OJD prevalence area for implementation from January 2011
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As of 1st January 2011, Victoria’s Prevalence Areas have changed. Victoria consists of two Prevalence Areas: a Medium Prevalence Area and a High Prevalence Area. The following shires are included in the Medium Prevalence Area: Mildura, Swan Hill, West Wimmera, Glenelg, Gannawarra, Yarriambiack, Buloke, Horsham and Hindmarsh. All other Victorian shires are in the High Prevalence Area.
Fig 2: Victorian prevalence area for implementation from 1 Jan 2011
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Why are Prevalence Areas important?
Under the Assurance Based Credits (ABC) Scheme, points are awarded in Category A of the ABC score for the Prevalence Area. These points contribute to a flock or mob’s ABC score. Flocks in the Medium Prevalence Area (excluding infected and suspected of being infected flocks) may claim 2 credit points in Category A of their ABC score. Flocks in the High Prevalence Area and infected and suspected of being infected flocks cannot claim any credits in Category A, but may gain credits in other categories through testing, vaccination and risk assessments.
Further information
Further information about OJD can be obtained from animal health staff at your local DPI office or on the DPI web site http://www.dpi.vic.gov.au/farming/OJD
Acknowledgements
This Information note was developed by Martin Roche, January 2006.
It was reviewed by Kirsty Fraser, Biosecurity Victoria. December 2010.
ISSN 1329-8062
Published and Authorised by:
Department of Primary Industries
1 Spring Street
Melbourne, Victoria
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