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A number from one to four rating containment.
Also known as: BSL marking, Containment level
Biosafety level rates the containment a laboratory provides, from one for agents not known to cause disease to four for agents with no available treatment. The level describes the facility rather than the organism, so the same agent can be handled at different levels under different protocols.
Rates the containment provided by a laboratory facility on a scale from one to four.
Contexts: Laboratory
Describes the facility and its procedures rather than the agent, so a single organism can be handled at different levels according to the work being done.
Contexts: Laboratory
Is displayed with the biohazard symbol and the agents in use, since the sign is an entry control rather than a description of the room's fittings.
Contexts: Laboratory
A printed sign carrying a numeral, the three-crescent biohazard symbol and a list of names.