Model for ranking freshwater fish farms according to their risk of infection and illustration for viral haemorrhagic septicaemia

摘要: We developed a model to calculate quantitative risk score for individual aquaculture sites. The indicates the of site being infected with specific fish pathogen (viral haemorrhagic septicaemia virus (VHSV); infectious haematopoietic necrosis virus, Koi herpes virus), and is intended be used ranking sites support surveillance demonstration zone or member state freedom from these pathogens. inputs include range qualitative estimates factors organised into five themes (1) Live egg movements; (2) Exposure via water; (3) On-site processing; (4) Short-distance mechanical transmission; (5) Distance-independent transmission. calculated an value between zero one indicate relative other (thereby allowing ranking). was applied evaluate 76 rainbow trout farms in 3 countries (42 England, 32 Italy 2 Switzerland) aim establish their VHSV. Risk scores England showed great variation, clearly enabling ranking. Scores ranged 0.002 0.254 (mean 0.080) 0.011 0.778 0.130) Italy, reflecting diversity infection status countries. Requirements broader application are discussed. Cost efficient farm data collection important realise benefits risk-based approach.