Waterborne diseases are caused by pathogenic microorganisms that most commonly are transmitted in contaminated fresh water.
Infection results during bathing, washing, drinking, in the preparation of food, or the consumption of infected food.
Various forms of waterborne diarrheal disease probably are the most prominent examples, and affect mainly children in developing countries.
According to the World Health Organization such diseases cause about 1.8 million human deaths annually.
The World Health Organization estimates that 88% of that burden is attributable to unsafe water supply, sanitation and hygiene.