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Which stage is missing from the chain of infection: Infectious Disease, Reservoir, Portal of Exit, ________, Portal of Entry, Susceptible Host.

Which stage is missing from the chain of infection: Infectious Disease, Reservoir, Portal of Exit, ________, Portal of Entry, Susceptible Host.
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Which stage is missing from the chain of infection: Infectious Disease, Reservoir, Portal of Exit, ________, Portal of Entry, Susceptible Host.

User Nespapu
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means of transmission
User Glace
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