Related Experiment Video
Updated: Jul 25, 2026

A Method to Test the Efficacy of Handwashing for the Removal of Emerging Infectious Pathogens
Published on: June 7, 2017
Dispersal of bacteria by an electric air hand dryer
Abstract:
The potential risk of an electric air hand dryer contributing to airborne infection in a hospital was investigated using a strain of Serratia marcescens and a strain of coagulase-negative, streptomycin-resistant Staphylococcus. Dispersal of marker bacteria by the air dryer was demonstrated within a radius of about 3 feet from the dryer and to the investigator's laboratory coat. When paper towels were used for hand drying, no dispersal of marker bacteria was demonstrated. It is suggested that air hand dryers are unsuitable for use in critical patient care areas as they may contribute to cross infection either via airborne dissemination or via contaminated personnel.
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