Hygiene is a set of conditions or practices to maintaining health and preventing disease, especially in order to prevent illness or the spread of diseases through cleanliness.
Reference Definition by WHO: Hygiene refers to conditions and practices that help to maintain health and prevent the spread of diseases. Medical hygiene therefore includes a specific set of practices associated with this preservation of health, for example environmental cleaning, sterilization of equipment, hand hygiene, water and sanitation and safe disposal of medical waste.
Related Definitions in the Project: The HSE Management
