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Cleanliness | Maximum average concentration of bacteria by sedimentation method (plankton method) | Air cleanliness level | Reference surgery | ||||
Operation Area | Around area | Reference surgery | Around area | ||||
I | 0. 2cfu/30min φ90 (5cfu/m³) | 0.4 cfu /30min φ90 (10cfu/m³) | 5 | 6 | Prosthesis implants, certain large organ transplants, surgical site infections can directly endanger life and quality of life and other operations | ||
II | 0. 75cfu/30min φ90 (25cfu/m³) | 1. 5cfu/30min φ90 (50cfu/m³) | 6 | 7 | Major surgery involving deep tissues and major organs of life | ||
III | 2. 0cfu/30min φ90 (75cfu/m³) | 4. 0cfu/30min φ90 (150cfu/m³) | 7 | 8 | Other surgical procedures | ||
IV | 6. 0cfu/30min φ90 | 8.5 | Infection and severe contamination surgery | ||||















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