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A means to quantify just how a particular biohazard should be handled in a laboratory environment.

BSL-1: Agent does not cause disease in humans. Wear gloves and a lab coat. Wash your hands before eating.

BSL-2: Agents of moderate potential hazard. Don't let random people in your lab. Be careful with contaminated sharps. Double bag your hands, lab coat, and face mask.

BSL-3: Agents may cause serious or potentially lethal disease via inhalation. Train your lab rats. Work in a safety cabinet. Pay attention to ventilation when designing your lab. Gloves, gown, and mask with a respirator.

BSL-4: Dangerous and exotic agents which pose a high individual risk of aerosol-transmitted laboratory infections and life-threatening disease. Work in a glovebox or in a safety cabinet while wearing a bunny suit. Shower after leaving lab. Autoclave lab clothing before washing it.

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