Pathogenic diseases:
-By bacterias: Campylobacteriosis, diarrheogenic E. coli
Bacterias are microscopic living organisms, usually one-celled, that can be found everywhere. They are prokaryotes and can be ubiquitous or cause damage. Some of these bacteria can be harmful to human health. The presence of coliform bacteria (which are those contained in fecal matter) can indicate a contamination of the water and therefore the presence of harmful pathogens in the water.
-By parasites: Cryptosporidiosis, giardiasis
-By viruses: Encephalitis, gastroenteritis, hepatitis A