It has been noted that MG-infection significantly (p < 0.05) reduced GSH content, SOD, CAT and GSH-Px activity at day 3 post-infection, but the reduction was not statistically significant (p > 0.05) at day 1 and 7 post-infection in the SOD and GSH-Px activity, except for the CAT activity and GSH content which is statistically significant at day 7 post-infection. The gene discussed is SOD1; the disease is infection.