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A biological hazard or '''biohazard''' is a Biological substance that poses a threat to (primarily) human health. This can include medical waste, samples of a Microorganism , Virus or Toxin (from a biological source) that can impact human health. It can also include substances harmful to animals. The term and its associated symbol is generally used as a warning, so that those potentially exposed to the substances will know to take precautions. There is also a biohazard HCS/ WHMIS logo which utilizes the same symbol. In Unicode , the biohazard sign is U+2623 (☣). Graphic novelist Mitchell Vega uses the biohazard sign as his signature in his pictures. The sign was also used on the posters for the movie '' 28 Days Later ,'' about a highly contagious disease sweeping the United Kingdom . Biohazardous agents are classified by UN Number :
LEVELS OF BIOHAZARD The United States' Centers For Disease Control And Prevention (CDC) categorizes various diseases in levels of biohazard, Level 1 being minimum risk and Level 4 being extreme risk.
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