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１９８９～１９９６年，调查宁波市９所医院的消毒工作，紫外线辐照度值合格率逐年上升，而压力蒸汽灭菌合格率近年却明显下降，室内空气与物体表面细菌污染的超标率亦明显上升。物体表面金黄色葡萄球菌与绿脓杆菌检出率达１７３３％。
From 1989 to 1996, the disinfection of 9 hospitals in Ningbo City was investigated. The passing rate of UV irradiance value increased year by year. However, the passing rate of pressure steam sterilization decreased significantly in recent years. The over-standard rate of bacterial contamination on indoor air and objects also increased significantly . The surface of Staphylococcus aureus and Pseudomonas aeruginosa detection rate of 17 33%.