title: Evaluation of risk and vulnerability using a Disease Flow Centrality measure in dynamic cattle trade networks.
abstract: A new method for the calculation of a centrality measure (Disease Flow Centrality, DFC), which takes into account temporal dynamics of livestock movement networks, is proposed. The method is based on a network traversal algorithm which represents an epidemic process more realistically compared with traditional graph traversal algorithms used in the calculation of centrality measures on static networks. The new approach was tested on networks generated from all the registered movements of cattle in Italy in the years 2007, 2008 and 2009 and the results were compared to those obtained by classical centrality measures. The results show that DFC values often differ substantially from those of other centrality measures and that these DFC values tend to be more unstable in time. The DFC offers several advantages for assessing risk and vulnerability of specific holdings and of an entire network, using recent movement data from national livestock databases. Some examples also indicate how the basic approach in the DFC calculation could be expanded into a more complex epidemic model by incorporating weights and how it could be combined with a geo-spatial perspective.
authors.affiliation: European Commission, Joint Research Centre, Institute for the Protection and Security of the Citizen, Via Fermi 2749, Ispra (VA), Italy. fabrizio.natale@jrc.ec.europa.eu
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Natale
authors.forename: Lara
authors.initials: L
authors.lastname: Savini
authors.forename: Armando
authors.initials: A
authors.lastname: Giovannini
authors.forename: Paolo
authors.initials: P
authors.lastname: Calistri
authors.forename: Luca
authors.initials: L
authors.lastname: Candeloro
authors.forename: Gianluca
authors.initials: G
authors.lastname: Fiore
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology* / Q000635:transmission*; D003141:Communicable Diseases / Q000453:epidemiology / Q000635:transmission / Q000662:veterinary*; D004196:Disease Outbreaks / Q000662:veterinary; D008962:Models, Theoretical; D009068:Movement; D018570:Risk Assessment; D014186:Transportation