Koch's postulates


The series of conditions that must be met in order to establish a microorganism as the causative agent of a disease, namely: it must be present in all cases of the disease; inoculations of its pure cultures must produce the disease in susceptible animals; and from these it must again be isolated and propagated in pure cultures.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.