 Hygiene in a variety of settings plays an important role in preventing the spread of infectious diseases.It includes procedures used in a variety of domestic situations such as hand hygiene, respiratory hygiene, food and water hygiene, general home hygiene (hygiene of environmental sites and surfaces), care of domestic animals, and home health care (the care of those who are at greater risk of infection).At present, these components of hygiene tend to be regarded as separate issues, although based on the same underlying microbiological principles.