Each exposure treatment was performed over a predetermined period of time. Soon after treatment, bacteria on each film were recovered with 10 ml sterile saline solution and the number of viable cells was determined using tryptic soy agar
Each exposure treatment was performed over a predeterminedperiod of time. Soon after treatment, bacteria on each film wererecovered with 10 ml sterile saline solution and the number ofviable cells was determined using tryptic soy agar