Acute diarrhoeal diseases are among the leading causes of mortality in infants and young children in many developing countries. In most cases, death is caused by dehydration. Dehydration from diarrhoea can be prevented by giving extra fluids at home, or it can be treated simply, effectively, and cheaply in all age-groups and in all but the most severe cases by giving patients by mouth an adequate glucose-electrolyte solution called Oral Rehydration Salts (ORS) solution. Oral rehydration therapy (ORT) is a type of fluid replacement used to prevent or treat dehydration especially that due to diarrhea. It involves drinking water with modest amounts of sugar and salt added (an oral rehydration solution or ORS) while continuing to eat. Routine therapy also includes supplemental zinc. Caretakers are taught the signs of dehydration and/or worsening dehydration. The World Health Organization specify indications, preparations and procedures for ORT.