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Volume 8, Number 3—March 2002

Research

Associations between Indicators of Livestock Farming Intensity and Incidence of Human Shiga Toxin-Producing Escherichia Coli Infection

James E. Valcour, Pascal Michel†, Scott A. McEwen, and Jeffrey B. Wilson‡Comments to Author 
Author affiliations: University of Guelph, Guelph, Ontario, Canada; †Université de Montréal, St-Hyacinthe, Québec, Canada; ‡University of Guelph, Guelph, Ontario, and Centre for Infectious Disease Prevention and Control, Health Canada, Ottawa, Ontario, Canada;

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Table 1

Dimensions and components used in creating livestock density indicators to predict incidence of human shiga toxin-producing Escherichia coli infection, Ontario

Dimension Component
Animal Total no. of cattle in CCSa
Total no. of dairy cattle in CCS
Total no. of beef cattle in CCS
Total no. of chickens in CCS
Total no. of pigs in CCS
Manure Area of CCS having manure applied via solid spreader
Area of CCS having manure applied via irrigation system
Area of CCS having manure applied to soil surface via liquid spreader
Area of CCS having manure injected into soil via liquid spreader
Land use Total CCS area
Absolute or % area of farm land in CCS
Absolute or % area of pasture land in CCS
Absolute or % area of crop land in CCS
Human population Total human population in CCS

aCCS = consolidated census subdivision. Area of CCS is in square kilometers; absolute = absolute squar
kilometers.

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