Description of empirical movement data from Canadian ...

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Title Description of empirical movement data from Canadian swine herds with an application to a disease spread simulation model
Author(s) Jette Christensen, Bruce McNab, Henrik Stryhn, Ian Dohoo, Daniel Hurnik, John Kellar
Journal Preventive Veterinary Medicine
Date 2008
Volume 83
Issue 2
Start page 170
End page 185
Abstract We report the methods and findings of a survey of Canadian swine producers summarizing farm-types at-risk of foreign animal disease (FAD) and the routine movement of animals, semen and workers among swine farms, as observed during a 42-day period. Of the 311 producers who returned completed questionnaires, 17% represented swine-herds with no swine or semen movement on or off the farm during the 42 days, 57% were sow herds or farrow-to-finish herds with limited movement onto the farm but movement off the farm, and 26% were swine-herds with movements on and off the farm. A substantial number of premises (>50% in some provinces) with swine also kept other animal species on the same premises. We applied the empirical movement data from the survey in a stochastic simulation model to estimate the number of herds infected and the basic regional distribution of infection that could be expected to occur if the FAD was not detected and routine movements were permitted to occur up to 42 days after infection with a FAD of a single randomly selected herd. Forty-five percent of the simulations did not involve spread beyond the index farm, whereas 34.8% involved spread among five or more farms after 42 days of routine movement.
DOI 10.1016/j.prevetmed.2007.07.004

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