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Laboratory Hazard Classifications

Containment laboratories fall into four classes : CL1, CL2, CL3 & CL4

Hazard Group 1 : Does not represent a significant hazard.

Hazard Group 2 : A biological agant that can cause severe human disease and may be a hazard to employees; it is unlikely to spread to the community and there is usually effective prophylaxis or treatment available e.g. Vibrio Cholerae, Listeria Monocytogenes, Polio virus.

Hazard Group 3 : A biological agent that can cause severe human disease and presents a hazard to employees; it may present a risk of spreading to the community, but there is usually effective prophylaxis or treatment available e.g. Yersinia Pestis, Histoplasma spp, Hepatitis B virus, Human Retrovirus and Verotoxigenic Escherichia coli strains.

Hazard Group 4 : A biological agent that causes severe human disease and is a serious hazard to employees; it is likely to spread to the community and there is usually no effective prophylaxis or treatment available e.g. Lassa, Marburg and Ebola viruses.

Case Studies