Class

Cause

Example

Waterborne

Pathogens that originate in fecal material and are transmitted by ingestion

Cholera, typhoid fever

Water-washed

Organisms that originate in feces are transmitted through contact because of inadequate sanitation or

hygiene

Trachoma

Water-based

Organisms that originate in the water or spend part of their life cycle in aquatic animals and come in direct

contact with humans in water or by inhalation

Schistosomiasis, Legionellosis

Water-related

Microorganisms with life cycles associated with insects that live or breed in water

Yellow fever