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Volume 24, Number 2—February 2018
Dispatch

Effects of Culling on Leptospira interrogans Carriage by Rats

Michael J. LeeComments to Author , Kaylee A. Byers, Christina M. Donovan, Julie J. Bidulka, Craig Stephen, David M. Patrick, and Chelsea G. Himsworth
Author affiliations: The University of British Columbia, Vancouver, British Columbia, Canada (M.J. Lee, K.A. Byers, C.M. Donovan, D.M. Patrick, C.G. Himsworth); Canadian Wildlife Health Cooperative, Abbotsford, British Columbia, Canada (M.J. Lee, K.A. Byers, C. Stephen, C.G. Himsworth); British Columbia Ministry of Agriculture, Abbotsford (J.J. Bidulka, C.G. Himsworth); University of Saskatchewan, Saskatoon, Saskatchewan, Canada (C. Stephen); British Columbia Centre for Disease Control, Vancouver (D.M. Patrick)

Main Article

Table 2

Results of model building in a study of the effects of culling on Leptospira interrogans carriage by rats, Vancouver, British Columbia, Canada, June 2016–January 2017

Covariate
 Unadjusted odds ratio* (95% CI)
 Adjusted odds ratio† (95% CI)
 p value
Season
Summer Reference –‡ –
Fall 0.44 (0.13–1.39) – –
Winter
 0.87 (0.22–3.24)
 –
 –
Sex
F Reference – –
M
 1.28 (0.70–2.37)
 –
 –
Sexual maturity
Juvenile Reference – –
Mature
 16.26 (6.28–51.95)
 –
 –
Continuous length, cm
 1.25 (1.18–1.35)
 –
 –
Wounds
No Reference Reference
Yes
 1.81 (1.42–2.39)
 3.87 (1.73–9.12)
 0.0013
Weight, g
<122 Reference Reference
>122
 17.88 (7.22–53.28)
 9.98 (3.70–31.74)
 <10–4
Intervention
Before intervention, all block types, n = 261 Reference Reference
After intervention, control blocks, n = 97 0.69 (0.22–2.00) 0.77 (0.22–2.58) 0.68
After intervention, nonkill flanking blocks, n = 33 1.50 (0.49–4.40) 2.22 (0.65–7.47) 0.19
After intervention, intervention blocks, n = 39 8.67 (2.02–55.00) 9.55 (1.75–78.31) 0.016

*Bivariable relationships between the indicated covariate and L. interrogans status, while controlling for the random effect of the block.
†Results of the final multivariable model in which the effect of each covariate is adjusted for other covariates in the model.
‡Dashes indicate variables not carried forward into the final multivariable model on the basis of statistical confounding criteria.

Main Article

Page created: January 17, 2018
Page updated: January 17, 2018
Page reviewed: January 17, 2018
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