GSTM1 and infection: Specific to PRV, neither Hb oxygen binding potential as measured by partial pressure required to achieve 50% saturation (P50) nor blood pH was affected by PRV at any infection stage as determined by two-way ANOVA or multiple comparison tests that control family-wise type-I error (Bonferroni, Sidak, Holm–Sidak; p-values provided in Zhang et al., 2019).