Table 1.

Practical interpretation of qualitative probability ratings [24].

Term	Meaning for probability of event occurrence	Meaning for consequence	Meaning for risk estimated
Negligible	Probability of occurrence of the event is possible only in exceptional circumstances	Low or no impact	Allow import without restrictions
Low	Occurrence of an event is a possibility in some cases	Minor impact	Authorise with specific measures to reduce the risks
Moderate	Occurrence of the event is a possibility	Average impact	Provide assessment of mitigation options before authorising
High	Occurrence of the event is clearly a possibility	Serious impact	Prohibited until measures to reduce the risk have proven their efficiency (implement and audit)