Results of multivariable model (n = 1296); conditional logistic regression model with farm as matching variable.

Exposure variables are dam PregSure vaccination, lactation number, colostrum from different cow(s) and raw milk from dam only. Interactions were included between dam PregSure vaccination and lactation number, and between dam PregSure vaccination and colostrum from different cow(s). The interaction terms have been multiplied with the baseline odds ratios to obtain odds ratios for each variable category above baseline.