Commission Decision of 20 November 2008 on guidelines for the purpose of the risk-based animal health surveillance schemes provided for in Council Directive 2006/88/EC (notified under document number C(2008) 6787) (Text with EEA relevance) (2008/896/EC)

6.3. MODEL TO DETERMINE THE RISK LEVEL OF FARMS AND MOLLUSC FARMING AREAS

This model to determine the risk level (high/medium/low) of farms or mollusc farming areas comprises three steps:

Step I

:

Approximation of the likelihood of the contraction of disease on the farm or in the mollusc farming area;

Step II

:

Approximation of the likelihood of the spread of disease from the farm or mollusc farming area;

Step III

:

Combining the estimates of risk levels resulting from steps I and II.

Step I

Approximation of the likelihood of the contraction of disease on the farm or in the mollusc farming area

Likelihood of the contraction of disease via water and due to the geographical proximity of farms and mollusc farming areas	Likelihood of the contraction of disease through movements of aquaculture animals	Level of risk
High	High	High
High	Low	Medium
Low	High	Medium
Low	Low	Low

Step II

Approximation of the likelihood of the spread of disease from the farm or mollusc farming area

Likelihood of the spread of disease via water and due to the geographical proximity of farms and mollusc farming areas	Likelihood of the spread of disease through movements of aquaculture animals	Level of risk
High	High	High
High	Low	Medium
Low	High	Medium
Low	Low	Low

Step III

Combining the estimates of risk levels resulting from steps I and II

Step I. Likelihood of the contraction of disease	High	M	H	H
	Medium	L	M	H
	Low	L	L	M
		Low	Medium	High
		Step II. Likelihood of the spread of disease