Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. WAterborne diseases are caused by pathogenic microorganisms which are directly transmitted when contaminated fresh water is consumed. COntaminated fresh water, used in the preparation of food, can be the source of foodborne disease through consumption of the same microorganisms. ACcording to the World Health Organization, diarrheal disease accounts for an estimated 4.1% of the total DALY global burden of disease and is responsible for the deaths of 1.8 million people every year. IT was estimated that 88% of that burden is attributable to unsafe water supply, sanitation and hygiene, and is mostly concentrated in children in developing countries.