Main Page | See live article | Alphabetical index Biohazard is a shorthand term for "biological hazard". It refers to biological substances that pose a threat to (primarily) human beings. This can include medical waste, samples of a virus or bacterium that can affect humans, and so forth. It is generally used as a warning, so that those potentially exposed to the substances will know to take precautions. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.