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pathogen

PATH-uh-jin /ˈpæθədʒən/

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FormalAcademicScientific

A biological agent, such as a bacterium, virus, fungus, or parasite, that causes disease.

Emphasizes the disease-producing capacity of a micro-organism or agent.

The story behind the word. Constructed from Greek 'pathos' (suffering or disease) and '-genes' (born of or producing). It was introduced into medical vocabulary in the late 19th century as germ theory replaced miasma theory.

Word relationships

infectious agent: Infectious agent is broader and can include sub-viral entities like prions, whereas pathogen commonly refers to standard microbes.
germ: Germ is an informal, colloquial word, whereas pathogen is the precise scientific term.

commensal organism: A commensal organism lives on or in a host without causing harm or disease.

Commonly confused with

carcinogen: A pathogen causes infectious disease, whereas a carcinogen causes cancer (though some pathogens can be carcinogenic).

Word family

pathogenic (adjective): Capable of causing disease
pathogenicity (noun): The property of causing disease

Collocations

pathogen transmission
airborne pathogen
bloodborne pathogen
opportunistic pathogen

Example sentences

"Water filtration plants must maintain strict protocols to prevent waterborne pathogens from entering the city supply." Public health report
"Hospitals implement rigorous sterilization routines to eliminate opportunistic pathogens on surgical equipment." Academic publication

Memory hook

PATH-o-gen creates a PATH of disease and suffering. Producer of suffering and disease

When not to use

Do not use for toxic chemicals or radiation; a pathogen must be an infectious biological entity.

Fun facts

Fewer than 1% of all bacteria on Earth are actual pathogens to humans; most are harmless or beneficial.
Prions are pathogens that contain no genetic material whatsoever—they are simply misfolded proteins that corrupt other proteins.