Sanitation refers to public health conditions related to clean drinking water and treatment and disposal of human excreta and sewage. It is the process of keeping places free from dirt, infection, disease, etc., by removing waste, trash, and garbage, by cleaning streets, etc.. Sanitation can include personal sanitation and public hygiene. Personal sanitation work can include handling menstrual waste, cleaning household toilets, and managing household garbage. Public sanitation work can involve garbage collection, transfer and treatment (municipal solid waste management), cleaning drains, streets, schools, trains, public spaces, community toilets and public toilets, sewers, operating sewage treatment plants, etc.. The World Health Organization defines sanitation as the provision of facilities and services for the safe disposal of human urine and faeces. The term sanitation also refers to the maintenance of hygienic conditions, through services such as garbage collection and wastewater disposal. Poor sanitation is linked to transmission of diarrhoeal diseases such as cholera and dysentery, as well as typhoid, intestinal worm infections. Benefits of improved sanitation extend well beyond reducing the risk of diarrhoea. These include reducing the spread of intestinal worms, schistosomiasis and trachoma, which are neglected tropical diseases that cause suffering for millions; reducing the severity and impact of malnutrition; promoting dignity and boosting safety, particularly among women and girls.