Maternal and fetal predictors of fetal viral load and death in third trimester, type 2 porcine reproductive and respiratory syndrome virus infected pregnant gilts.

When developing full models, only variables that were highly significant ( P < 0.1 or 0.05 depending on the model) in unconditional analyses, uncorrelated (Pearson’s correlation coefficients, r < 0.5), and biologically plausible predictors of the outcome of interest were considered (Additional files 1 , 2 , 3 ).

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