T/F: it takes more than one exposure to exhibit symptoms of a hypersensitivity
T- individuals must be exposed once before to become sensitized, upon second exposure the immune system reacts in a damaging way
True. It usually takes more than one exposure to a substance for a hypersensitivity (also known as an allergy) to develop and for symptoms to manifest. This is because the immune system needs to learn to recognize the substance as harmful and build up a response to it. Subsequent exposures can then trigger that response, leading to symptoms such as itching, swelling, hives, difficulty breathing, and anaphylaxis. However, in some cases, an individual may develop symptoms after just one exposure to the offending substance.
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