Phrase guide

Koch's postulate

noun · 1 senses · updated from the 2026-07-25 local source snapshot

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1

noun

Meaning 1

Any of four criteria designed to establish a causative relationship between a microbe and a disease: (i) the microorganism must be found in abundance in all organisms suffering from the disease, but should not be found in healthy organisms; (ii) it must be isolated from a diseased organism and grown in pure culture; (iii) the cultured microorganism should cause disease when introduced into a healthy organism; (iv) the microorganism must be reisolated from the inoculated, diseased experimental host and identified as being identical to the original specific causative agent.

Definition source: English Wiktionary via Wiktextract

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Meaning relationships

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History

Etymology

Formulated by Robert Koch and Friedrich Loeffler in 1884.