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

Oidtmann, Birgit C; Pearce, Fiona M; Thrush, Mark A; Peeler, Edmund J; Ceolin, Chiara; Stärk, Katharina D C; Dalla Pozza, Manuela; Afonso, Ana; Diserens, Nicolas; Reese, R Allan; Cameron, Angus (2014). Model for ranking freshwater fish farms according to their risk of infection and illustration for viral haemorrhagic septicaemia. Preventive veterinary medicine, 115(3-4), pp. 263-279. Elsevier 10.1016/j.prevetmed.2014.04.005

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

Item Type:

Journal Article (Original Article)

Division/Institute:

05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP) > Institute of Animal Pathology
05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP)
05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP) > Center for Fish and Wildlife Health (FIWI)

UniBE Contributor:

Diserens, Nicolas

Subjects:

600 Technology > 630 Agriculture

ISSN:

0167-5877

Publisher:

Elsevier

Language:

English

Submitter:

Lucia Gugger-Raaflaub

Date Deposited:

17 Sep 2015 11:41

Last Modified:

25 Sep 2015 11:15

Publisher DOI:

10.1016/j.prevetmed.2014.04.005

PubMed ID:

24815039

Uncontrolled Keywords:

Disease, Disease freedom, Fish, Risk factor, Risk-based surveillance, Viral haemorrhagic septicaemia

BORIS DOI:

10.7892/boris.71695

URI:

https://boris.unibe.ch/id/eprint/71695

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