The category of exposure that affects the most vulnerable population is secondary exposure.

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Secondary exposure occurs when someone is exposed to a substance or situation through contact with someone who has been directly exposed. This can happen through skin-to-skin contact, sharing contaminated objects, or breathing in contaminated air. Secondary exposure can be particularly harmful to vulnerable populations, such as children, the elderly, and people with compromised immune systems, because they may be more susceptible to the effects of the substance or situation.

The Category of Exposure That Affects the Most Vulnerable Population