52 table 1. summary of recommended biosafety levels for infectious agents. biosafety level agents...
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52Table 1. Summary of
Recommended Biosafety Levels for Infectious Agents.
BiosafetyLevel
Agents Practices Safety Equipment
(Primary Barriers)Facilities
(Secondary Barriers)1 Not known to
consistently causedisease in healthy adults
Standard Microbiological Practices None required Open bench top sink
required2 Associated with human
disease, hazard =percutaneous injury,ingestion, mucous
membrane exposureBSL-1 practice plus:
! Limited access! Biohazard warning signs
! "Sharps" precautions! Biosafety manual defining any
needed wastedecontamination or medical
surveillance policiesPrimary barriers = Class I or II
BSCsor other physical containment
devices used for all manipulations of
agents that cause splashes oraerosols of infectious materials;PPEs: laboratory coats; gloves;
faceprotection as needed
BSL-1 plus:Autoclave available
3 Indigenous or exoticagents with potential for
aerosol transmission;disease may haveserious or lethalconsequences
BSL-2 practice plus:! Controlled access
! Decontamination of all waste! Decontamination of lab clothing
before laundering! Baseline serum
Primary barriers = Class I or II BCSs
or other physical containmentdevices used for all open
manipulations of agents; PPEs:protective lab clothing; gloves;
respiratory protection as neededBSL-2 plus:
! Physical separation fromaccess corridors
! Self-closing, double-dooraccess
! Exhausted air notrecirculated
! Negative airflow intolaboratory.53
4 Dangerous/exotic agentswhich pose high risk oflife-threatening disease,aerosol-transmitted lab
infections; or relatedagents with unknown risk
of transmissionBSL-3 practices plus:
! Clothing change beforeentering
! Shower on exit! All material decontaminated on
exit from facilityPrimary barriers = All proceduresconducted in Class III BSCs or
Class I or II BSCs in combinationwith full-body, air-supplied, positive
pressure personnel suitBSL-3 plus:
! Separate building orisolated zone
! Dedicated supply andexhaust, vacuum, and
decon systems! Other requirements outlined
in the text
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Risk Assessment ................................
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Principles of Biosafe ty .............................
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Laborato ry Bio safe ty Le vel C riteria .................. 17
Table 1. S ummary of R ecommended Biosafety
Levels for Infectious Agents. ................
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Recommended Biosafety Levels for Infectious Agents
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A: Bac terial Agen ts
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B: Fun gal Agen ts
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Pa rasitic Age nts ....................
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D: Prions ............................
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Rick ettsial Agen ts ...................
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Viral Agents (other than arboviruses)
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Arboviruses and Related Zoonotic Viruses
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Arbo virus es Assigned to Bio safe ty Leve l 2 ........
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