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pathogens

Definition

Disease causing microorganisms, such as bacteria, fungi, and viruses, found commonly in sewage, hospital waste, run-off water from farms, and in water used for swimming. Most pathogens are parasites (live off the host) and the diseases they cause are an indirect result of their obtaining food from, or shelter in, the host. Larger parasites (such as worms) and not called pathogens.

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