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Three critical components for an illness to be communicable are: a pathogen (such as bacteria, viruses, or parasites) that can cause disease; a mode of transmission (such as direct contact, airborne spread, or vector-borne transmission) that allows the pathogen to reach a susceptible host; and a susceptible host, which is an individual who is vulnerable to infection due to factors like immune status or prior exposure. These components work together to facilitate the spread of the illness within a population.

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