The decrease of the activity of key antioxidant enzymes in the lung such as SOD, CAT and GP, as well as the level of the non-protein sulfhydryl groups in animals injected and inhaled with OVA supports allegations that ovalbumin can provoke asthma, an oxidative stress-associated disease [3, 4, 6, 17]. This evidence concerns the gene SOD1 and asthma.