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Risk Groups are classifications that describe the relative hazard posed by infectious agents or toxins in the laboratory. The risk group to which an infectious agent or toxin is assigned is the primary, but not only, consideration used in a biological risk assessment to determine the appropriate biosafety level in which a worker can handle the infectious agent or toxin. Other considerations used in a biological risk assessment include the ability of an infectious agent or toxin to cause disease, the way in which the infectious agent or toxin causes disease, the activities performed in the laboratory, the safety equipment and design elements present in the laboratory, and the health and training of the laboratory worker. Risk group levels do not always correspond to biosafety levels. For example, a specific research project’s biological risk assessment for the use of human immunodeficiency virus (HIV), a Risk Group 3 agent, may correctly determine that HIV can be handled under Biosafety Level 2 conditions. Risk groups are designated from 1 (the lowest risk) to 4 (the highest risk).
A listing of the risk group definitions for many countries, including the US, can be found on the American Biological Safety Association website, in the WHO Laboratory Biosafety Manual, and the OIE Terrestrial Manual.
S3: Science Safety Security