Biosafety Level Requirements - phe.gov
https://www.phe.gov/s3/BioriskManagement/biocontainment/Pages/BSL-Requirements.aspx
WebSep 25, 2019 · In the United States, the designations BSL-1, BSL-2, BSL-3, and BSL-4 describe the minimum safe work practices, specially designed buildings, and safety equipment required to conduct work on infectious microorganisms and other biological hazards. BSL-4 is the highest biosafety level.
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