Biosafety Level 4 BSL4

BSL-4 is required for work with dangerous and exotic agents that pose a high individual risk of aerosol-transmitted laboratory infections and life-threatening disease. It is rare that BSL-4 containment is required for processing most biological threat samples unless intelligence or the submitting agency can provide information that warrants such measures. Materials transferred into BSL-4 laboratories are difficult to remove and forensic analyses are more difficult to perform than at lower levels of biological containment.

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