Epidemiologic Triad

The standard model of infectious disease causation:
(1) an external agent
(2) a susceptible host
(3) an environment that brings the host and agent together for disease to occur
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
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(3) It is usually diagnosed when patients reach the age of 3 years, and it is correlated with the epidemiologic triad of the firstborn, vaginally delivered child of a teenage mother.

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