Why is hand hygiene necessary?
The hands constitute the main form of transmission of microorganisms during patient care. The skin is a possible reservoir for various microorganisms that can be transferred from one surface to another. The skin of the hands hosts two principal microorganism populations: those belonging to the resident microbiota and those belonging to transient microbiota. Transient microbiotas colonize the most superficial layer of the skin, which allows their mechanical removal by handwashing with water and soap, although they are eliminated more easily when an antiseptic solution is used.