Epidemiology Paper

Communicable Disease Chain

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Infectious Agent

• Microbes – All Types • Pathogenicity • Invasiveness • Virulence • Infective Dose • Resistance

Reservoirs

• Humans • Animals • Plant/Soil

Portal of Exit

• Respiratory • Integumentary • Blood • GI • Sexual

Means of Transmission

• Direct • Indirect

Susceptible Host

• Defense Mechanisms • Immunity

o Natural o Artificial

Portal of Re-entry

• Same as Exit