Study of synergistic disinfection by UVC and positive/negative air ions for aerosolized Escherichia coli , Salmonella typhimurium , and Staphylococcus epidermidis in ventilation duct flow

for negative ions) led to higher inactivation than individual disinfection agents operating under the same dose. A synergetic inactivation effect was observed for S. epidermidis under the combined UVC and positive ion case, while the combined UVC and negative ion case showed significant synergy effects for E. coli and S. typhimurium.