Medium relative risk rankings
Many of the medium risk rankings reflect hazards that have severe adverse health effects, although the likelihood of illness from these hazards in the seafood commodity is rated as ‘unlikely’. This is the case for abalone and roe-off scallops (amnesic shellfish poison and paralytic shellfish poison); prawns, whether green or cooked (arsenic, V. cholerae O1 and S. Typhi); canned seafood (arsenic and C. botulinum); hot-smoked fish products (C. botulinum); and whole or filleted finfish, chilled or frozen, for cooking (arsenic).
The ‘unlikely’ ratings for the likelihood of adverse health effects reflect the effectiveness of existing risk management systems in place for those commodity/hazard combinations.
That many of the medium risk rankings are assigned to hazard/commodity pairs based on severe adverse health effects with unlikely occurrence reflects that the likelihood and severity ratings are not linear and that they are measured on different scales. That reflects the value judgement inherent in the ranking process, and allows inferences to be drawn as to which factors play a more important role in the final risk ranking assigned to each specific commodity group.
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