The Corona Virus Epidemic poses an important challenge to practical hygiene on a mass level. Recent research has shown that in places where a great number of persons convene, toilets and wash rooms might be critical for reducing or enhancing spread.The effectiveness of various types of eletcric hand dryers hasbeen at the origin of heated discussions, but to show evidence the the presence or absence of microbes on the hands is just one factor. Other factots, such as the risk of contamination of surfaces surrounding the hand drying device or of the release of contaminated aerosol into the atmosphere surrounding the device. Who knows of more recent studies which have taken into account these elements?