Most individuals infected with cholera develop mild illness involving only diarrhea. Less commonly infected individuals will develop more severe illnesses characterized by profuse watery stools, nausea, some vomiting and leg cramps. These symptoms may become more severe because of rapid loss of body fluids, dehydration and shock can occur in the most severe cases. Without rehydration therapy, death may occur within hours if severe illness is untreated. With proper treatment, the risk of fatal illness is significantly reduced.