Communicable Disease Chain

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Communicable Disease Chain

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Infectious Agent

Microbes – All Types

Pathogenicity

Invasiveness

Virulence

Infective Dose

Resistance

Means of Transmission

Direct

Indirect

Portal of Re-entry

Same as Exit

Portal of Exit

Respiratory

Integumentary

Blood

GI

Sexual

Susceptible Host

Defense Mechanisms

Immunity

Natural

Artificial

Reservoirs

Humans

Animals

Plant/Soil