The COVID-19 pandemic reminded us all of how important basic hygiene is to avoid cross-infection, and how easily such aerosol-transmitted infections can spread - both directly through the air, but also via a surface where the droplets come to rest. That infections can be spread via surfaces has been known since 19th century studies on puerperal fever (then a significant cause of maternal mortality). The emergence of antibiotic resistant bacteria makes it more important then ever to avoid infection in the first place.