Four biosafety levels have been defined that consist of specified lab practices and techniques, safety equipment and lab facilities. These are commensurate with the operations performed and with the hazard potential posed by the biohazardous agents with which the laboratory works.
The reference for this section is the BMBL (Biosafety in Microbiological and Biomedical Laboratories), 5th Edition, 2007, U.S. Department of Health and Human Services. Described below are Biosafety Levels 1 through 3. Biosafety level 4, the maximum containment lab, described in the BMBL is not included in this manual, as facilities do not presently exist at the University that would accommodate the safety regulations involved with Level 4 work. Table 4 presents a summary of the different biosafety level requirements.