The time interval between invasion by an infectious agent and the first appearance of signs and symptoms of the disease is called:

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The incubation period is the time interval between invasion by an infectious agent and the first appearance of signs and symptoms.The communicable period is the interval during which an infectious agent may be transferred directly or indirectly from an infected person to another person.Infectiousness is the measure of the potential ability of an infected host to transmit the infection to other hosts.Endemic refers to the constant presence of a disease within a geographic area or a population.

The Time Interval Between Invasion by an Infectious Agent and the First