The Sophie Davis School of Biomedical Education The City University of New York
STEP 8 HOST DEFENSE, INFECTION AND PATHOGENESIS
	Department of Microbiology & Immunology
	...After it has been determined that the pathogenic organism is present in the animal body, and after it has been shown that the organism can reproduce in the body and be transmitted from one individual to another, the most important experiment remains to be done....to determine the conditions necessary for growth and reproduction of the microorganism." Robert Koch, 1881

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