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Bio safety levels are a set of bio containment controls that are required to separate the biological agents based on the risk they cause on the environment, and human beings.
These levels are ranked from one to four. Each level has specific controls for containment of biological agents and microbes. The controls are based on the infectivity of the disease, severity of the disease, source of the agent and route of invasion into human body.
These bio safety levels play an important role in designing the facility, safety environment, and laboratory practices.
Each bio safety level has its own standard laboratory practices that one must follow. However, each microbiology laboratory, irrespective of their bio safety level, must follow the basic good laboratory practices.