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1 In communicable disease control, contact with a source of a disease agent that leads to transmission of the agent to a new host.

2 In environmental hazard control, the amount of a disease agent such as a toxic substance to which person(s) have been exposed and that may lead to disease or clinical signs, but not necessarily the same as dose, which is the amount that actually acts on the body.

3 In noncommunicable disease control, “exposure” refers to any influence on health outcomes, including social influences on behavior such as adoption of cigarette smoking, or the process by which an agent or a factor such as high blood pressure influences health. Exposure to an agent can have beneficial, i.e., protective, rather than adverse, consequences.

Subjects: Environmental Science — Public Health and Epidemiology.

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