SG is the causative bacteria of FT, a severe systemic disease in chickens. FT has been eradicated from commercial poultry in many developed countries, including the US, Canada, and most countries in Western Europe (Shivaprasad, 2000). However, this disease remains common in some countries in Central and South America, Africa, and Asia, including Korea (Shivaprasad, 2000). It causes serious economic problems in the poultry industry in Korea, although SG has little public health significance because it has highly adapted to the chicken as a host species. Thus, the efficient control of SG in hatching eggs is particularly important. However, fewer studies on the antimicrobial effects of disinfectants against SG have been carried out than for SE. In this study, we achieved >4 log reduction of SG at 40 ppm and 80 ppm ClO2 gas treatment with a required exposure time of 30 min.