Changes of peroxidative evaluation indexes in mitochondria. Liver tissue samples were obtained from individual ducklings of each group at the indicated time points to isolate mitochondria. Then, the mitochondrial (A) CAT, (B) SOD, (C) GPX, (D) iNOS activities, and MDA (E) contents were detected with the corresponding assay kits. a–cBars in the same index at the same time point without the same superscripts differ significantly (P < 0.05). Abbreviations: BA, baicalin treatment after virus incubation; BC, blank control; CAT, catalase; GPX, glutathione peroxidase; iNOS, inducible nitric oxide synthase; MDA, malondialdehyde; SOD, superoxide dismutase; VC, virus control.