Environmental Health & Safety

University of Colorado Boulder

Resources

NIH – Basis for the Classification of Biohazardous Agents by Risk Group (RG)

This Environmental Health & Safety guideline documentation is intended for researchers and laboratory personnel.

Revised as of December 8, 2008

Risk Group 1 (RG1) Agents that are not associated with disease in healthy adult humans
Risk Group 2 (RG2) Agents that are associated with human disease which is rarely serious and for which preventive or therapeutic interventions are often available
Risk Group 3 (RG3) Agents that are associated with serious or lethal human disease for which preventive or therapeutic interventions may be available (high individual risk but low community risk)
Risk Group 4 (RG4) Agents that are likely to cause serious or lethal human disease for which preventive or therapeutic interventions are not usually available (high individual risk and high community risk)