In conclusion, Bacteriophage ST1, a virulent siphophage, was shown to have ability to inactivate S. Typhimurium ATCC 13311 both in vitro and in beverage. In soy bean milk, its antibacterial efficiency was dependent on bacteriophage concentration. Our data suggest that bacteriophage ST1 has a potential for being use as a biocontrol agent in foods. However, at this point, we are just beginning to exploit the potential of the bacteriophage for control bacteria in foods. Since the antibacterial activity of the bacteriophage is dependent on many factors such as concentration of contaminated bacteria, type of food, food matrix and temperature, in order to use the bacteriophage effectively, these factors are required to be studied and optimized for each individual condition.