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Biological Hazards

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Biological hazard

From Wikipedia, the free encyclopedia

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This article is about biological hazard. For other uses, see Biohazard (disambiguation).
The international biological hazard symbol
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The international biological hazard symbol
Immediate disposal of used needles into a sharps container is standard procedure.
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Immediate disposal of used needles into a sharps container is standard procedure.
Biohazard signage
Enlarge
Biohazard signage

A biological hazard or biohazard is an organism, or substance derived from an organism, 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 (☣).

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 for transportation by UN number:

  • UN 2814 (Infectious Substance, Affecting Humans)
  • UN 2900 (Infectious Substance, Affecting Animals)
  • UN 3733 (Diagnostic Specimen or Clinical Specimen or Biological Substance, Category B)
  • UN 3291 (Medical Waste)

Contents

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[edit] 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.

  • Biohazard Level 1: Several kinds of bacteria including Bacillus subtilis, canine hepatitis, E. coli, varicella (chicken pox), as well as some cell cultures and non-infectious bacteria. At this level precautions against the biohazardous materials in question are minimal, most likely involving gloves and some sort of facial protection. Usually, contaminated materials are left in open (but separately indicated) trash receptacles. Decontamination procedures for this level are similar in most respects to modern precautions against everyday viruses (i.e.: washing one's hands with anti-bacterial soap, washing all exposed surfaces of the lab with disinfectants, etc). In a lab environment, all materials used for cell and/or bacteria cultures are decontaminated via autoclave.
  • Biohazard Level 4: Bolivian fever, Dengue fever, Marburg Virus, Ebola, Hanta virus, Lassa virus, and other various hemorrhagic diseases (mostly of African descent). When dealing with biological hazards at this level the use of a Hazmat suit and a self-contained oxygen supply is mandatory. The entrance and exit of a level four biolab will contain multiple showers, a vacuum room, an ultraviolet light room, and other safety precautions designed to destroy all traces of the biohazard. Multiple airlocks are employed and are electronically secured to prevent both doors opening at the same time. All air and water service going to and coming from a Biosafety Level 4 biolab will undergo similar decontamination procedures to eliminate the possibility of an accidental release.

[edit] See also

[edit] References

  • Baldwin, C. L., & Runkle, R.S. (1967). Biohazards symbol: development of a biological hazards warning signal. Science, 158, 264–265. Pubmed unique identifier 6053882.

[edit] External links