Fig 1.
Putative causal diagram of factors that may influence the likelihood of E. coli O157:H7 in cattle feces.
Pen-dependent factors are in bold and italic typeface. Time-dependent factors are marked with an *. Lines indicate a putative association between factors.
Fig 2.
Mean temperature, dew-point, relative humidity and mean precipitation during the seven days preceding each sampling date.
Points show 7-day mean of average daily values. Upper and lower horizontal lines show 7-day means of maximum and minimum daily values. Bars represent mean precipitation over the 7 days preceding the sampling date.
Fig 3.
Proportion of fecal pats positive for E. coli O157:H7 by sampling date and weather conditions.
Data shown from control pens only (number of fecal samples = 1360). Light gray indicates year 1 (2014). Dark gray indicates year 2 (2015). Bars indicate 95% confidence intervals.
Table 1.
Results of mixed effect logistic regression models to assess the association between weather variables and the log odds of E. coli O157:H7 presence in fecal pats, after adjusting for pen and date as random effects.
Fig 4.
Proportion of fecal pats positive for E. coli O157:H7 by pen, and pen-level variables.
Data shown from pre-intervention time-point only (number of fecal samples = 1400). Light gray indicates year 1 (2014). Dark gray indicates year 2 (2015). Bars indicate 95% confidence intervals. Note: clustering of pens by sampling date is not shown.
Fig 5.
The change in the proportion of cattle fecal pats positive for E. coli O157:H7 over time.
(A) The proportion of fecal pats positive for E. coli O157:H7 by control and intervention groups, pre- and post-intervention. Bars indicate 95% confidence interval after adjusting the standard errors for clustering within pens. (Number of fecal samples = 2719) (B) Box-plots of the (unadjusted) change in within-pen prevalence of positive fecal pats within each pen (post- minus pre-intervention prevalence). (Number of fecal samples = 2719).