Fig. 5. The activities of XOD, MPO, and iNOS in PNS treated 3D4/2 cells with PCV2 infection. Negative control: the cells were not infected with PCV2 and not treated with PNS and VC; PCV2: the cells were infected with 10⁴TCID₅₀ PCV2; PCV2 + PNS 50–200: the cells were treated with PNS at concentration of 50, 100, or 200 µg/mL after 10⁴TCID₅₀ PCV2 infection respectively; PCV2 + VC: the cells were treated with VC at concentration of 200 µM after 10⁴TCID₅₀ PCV2 infection. The values are represented mean ± SD. Bars with different letters are statistically different (p < 0.05).

XOD, xanthine oxidase; PCV2, porcine circovirus type 2; PNS, Panax notoginseng saponins; VC, vitamin C; MPO, myeloperoxidase; iNOS, inducible nitric oxide synthetase; TCID₅₀, median tissue culture infectious dose.