Benchmark - Epidemiology.

Communicable Disease Chain

Infectious Agent

· Microbes – All Types

· Pathogenicity

· Invasiveness

· Virulence

· Infective Dose

· Resistance

Means of Transmission

· Direct

· Indirect

Portal of Reentry

· Same as Exit

Portal of Exit

· Respiratory

· Integumentary

· Blood

· GI

· Sexual

Susceptible Host

· Defense Mechanisms

· Immunity

· Natural

· Artificial

Reservoirs

· Humans

· Animals

· Plant/Soil

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