Infectious Diseases and Pathogenesis

The pathogenesis of infectious diseases reflects the relationship among the human host, the infectious agent, and the external environment portrays a host-agent-environment paradigm for the study of infectious diseases. The infectious agent can be either exogenous ( not normally found on or in the body) or endogenous (one that may be routinely cultured from a specific anatomic site but that does not normally cause disease in the host). Infection results when an exogenous agent is introduced into a host from the environment or when an endogenous agent overcomes innate host immunity to cause disease.

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