218 Research paper – Noremark – 2011 – Network analysis of cattle and pig movements in Sweden_ measures relevant for disease control and risk based surveillance

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218 Research paper – Noremark – 2011 – Network analysis of cattle and pig movements in Sweden_ measures relevant for disease control and risk based surveillance

In Significant Impact Groups:
Biosecurity \External biosecurity
Species targeted: Pigs;Dairy;
Age: Adult;
Summary:
Where to find the original material:
Country: SE
Registration of cattle and pig movements is mandatory in Sweden and all registered movements between farms in the years 2006-2008 were investigated. The networks were analysed as monthly and yearly networks, separately per species and with the two species together. Many farms had few or no contacts, while others had many, a pattern which has also been described from other countries. The cattle network and the combined network showed a recurring seasonal pattern, while this was not seen in the pig network. The in-degree was not equivalent to the ingoing infection chain; there were holdings with limited direct contacts, but a large number of indirect contacts. The ingoing infection chain could be a useful measure when setting up strategies for disease control and for risk based surveillance as it identifies holdings with many contacts through live animal movements and thus at potentially higher risk for introduction of contagious diseases.