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A biological or chemical agent or substance that is harmful or endangers life; this includes pathogenic organisms, their cultures, and tissue, hospital dressings, used hypodermic needles, etc., that are contaminated with blood or other body fluids, designated as hazardous waste. Sometimes physical environmental factors or conditions such as high levels of ionizing radiation are described as biohazards, although the warning symbols or logos used to identify biohazards and ionizing radiation are quite different.

Subjects: Public Health and Epidemiology — Science and Mathematics.

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