Transient skin flora. Transient or temporary skin flora refers to the microorganisms that transiently colonise the skin. This includes bacteria, fungi and viruses, which reach the hands, for example, by direct skin-to-skin contact or indirectly via objects.Hygienic hand disinfection primarily aims at deactivating the microorganisms of the transient flora.« Back.his includes bacteria, fungi and viruses, which reach the hands, for example, by direct skin-to-skin contact or indirectly via objects. Hygienic hand disinfection primarily aims at deactivating the microorganisms of the transient flora. « Back.