A specific combination of work practices, safety equipment, and facilities which are designed to minimize the exposure of workers and the environment to infectious agents.
The biosafety levels are:
- Level 1 — This level applies to agents that do not ordinarily cause human disease.
- Level 2 — This level is appropriate for agents that can cause human disease, but whose potential for transmission is limited.
- Level 3 — This level applies to agents that may be transmitted by the respiratory route which can cause serious infection.
- Level 4 — This level is used for the diagnosis of exotic agents that pose a high risk of life-threatening disease, which may be transmitted by the aerosol route and for which there is no vaccine or therapy.
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