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Biosafety Level 4 (BSL-4)

Primary barriers:

Biosafety cabinets used at other biosafety levels

Full-body, air-supplied, positive pressure personnel suit

Secondary barriers:

All physical barriers at BSL-3

isolated zone or a separate building;

dedicated supply and exhaust, vacuum, decontamination systems;

a recommended absence of windows                (or sealed and resistant to breakage)

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