| Biosafety
Level 4 |
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| Required
for work with dangerous and exotic |
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| agents which
pose a high risk of aerosol- |
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| transmitted
laboratory infections and life- |
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| threatening
disease |
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| n | special facility
design features are required |
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| n | all activities
confined to Class III biosafety cabinets, |
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| or Class II used
by workers wearing one-piece |
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| positive
pressure personnel suits ventilated by a
life |
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| support system |
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