Unverified50% confidenceFactExact time
The BSL biosafety level classification system consists of four levels from BSL-1 to BSL-4, with BSL-4 being the highest safety level, dedicated to handling highly lethal pathogens that can be transmitted via aerosol and for which no known vaccines or treatments exist.
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50%
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Long-term
Relevance
9/11/2026
First Seen
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