Communicable Disease Chain
Infectious Agent
Microbes – All Types
Pathogenicity
Invasiveness
Virulence
Infective Dose
Resistance
Susceptible Host
Defense Mechanisms
Immunity
Natural
Artificial
Reservoirs
Humans
Animals
Plant/Soil
Portal of Re-entry
Same as Exit
Portal of Exit
Respiratory
Integumentary
Blood
GI
Sexual
Means of Transmission
Direct
Indirect
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