C2 and infection: A total of 92 complement-related DEGs were identified between dietary MOS groups and the control group at various time points post-infection, including the representative members of c1r (complement component 1), c2 (complement component 2), c3 (complement component 3), c7 (complement component 7), c9 (complement component 9), cfh (complement factor h), c1qbp (complement component 1q subcomponent-binding protein, mitochondrial) and c1qtnf6 (complement c1q tumor necrosis factor-related protein 6) (Figure 4).