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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;

Main Article

Table 3

Top competing individual livestock density indicators for predicting the incidence of human shiga toxin-producing Escherichia coli infection, Ontario, 1996–1998

Livestock density indicator a Estimate S.E. r2
Ratio of beef cattle to human population
Intercept 0.6872
1.4634 0.1384
0.1018 0.099
No. of beef cattle per km2 township area
Intercept 0.0998
1.1645 0.0230
0.1674 0.098
No. of beef cattle per km2 weighted farmland (farmland/township area)
Intercept 0.0004
1.3085 0.0001
0.1430 0.076
No. of beef cattle per km2 weighted pasture land (pasture land/township area)
Intercept 0.0014
1.4449 0.0003
0.1182 0.060
Total no. of cattle per km2 of township area
Intercept 0.0154
1.2217 0.0034
0.1355 0.053
Total no. of cattle per km2 weighted pasture land (pasture land/township area)
Intercept 0.0003
1.4165 0.0001
0.1003 0.046
Total no. of cattle per km2 farmland
Intercept 0.0139
1.0532 0.0036
0.1834 0.045
Animal units per km2 township area
Intercept 0.0129
1.2548 0.0030
0.1317 0.044
Ratio of total number of cattle to human population
Intercept 0.1477
1.3878 0.0344
0.1050 0.043
Number of beef cattle
Intercept 0.0003
1.3515 0.0001
0.1540 0.041

aAll LDI significant at p>0.001.

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