| Koch's l. |
see under postulate.
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| Koch's node |
see nodus atrioventricularis.
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| Koch's p. |
if a guinea pig that has been previously infected with tuberculosis organisms is reinjected intracutaneously, the skin over the injected area undergoes necrosis and a superficial ulcer develops; the ulcer heals quickly and infection of regional lymph nodes is retarded. The phenomenon demonstrates development of ability to localize tubercle bacilli, which is the principle underlying tuberculin tests (q.v.). Called also Koch's reaction.
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| Koch's p.’s |
a statement of the kind of experimental evidence required to establish the etiologic relationship of a given microorganism to a given disease. The conditions included are (1) the microorganism must be observed in every case of the disease; (2) it must be isolated and grown in pure culture; (3) the pure culture must, when inoculated into a susceptible animal, reproduce the disease; and (4) the microorganism must be observed in, and recovered from, the experimentally diseased animal.
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| Koch's phenomenon (reaction), postulate, tuberculin |
see under phenomenon, postulate, and tuberculin.
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