World Health Organization designates laboratory facilities under four level

BIOSAFETY LEVEL LABORATORY TYPE LABORATORY PRACTICES SAFETY EQUIPMENT
1 Basic – Biosafety Level 1 Basic teaching research GMT None: Open bench word
2 Basic – Biosafety Level 2 Primary health services; diagnostic services, research GMT plus protective clothing, biohazard sign One bench plus BSC for potential aerosols
3 Containment – Biosafety Level 3 Special diagnostic service, research As Level 2 plus special clothing, controlled access, directional airflow BSC and/or other primary devices for all activities
4 Maximum containment – Biosafety Level 4 Dangerous pathogen units At Level 3 plus¬† airlock entry, shower exit, special waste disposal Class III BSC, or positive pressure suits in conjunction with Class II BSC’s, double-ended autoclave(through the wall), filtered air

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