细菌半定量培养新法（十二级法）研究报告

目的建立开放部位非均质标本细菌半定量培养的新方法 （十二级法）。方法采用＂十二级法＂和传统＂四区划线法＂（即五级法）对＂无呼吸道炎症人群＂咽拭子及临床患者痰液标本进行细菌半定量培养,从重复性、区分细菌相对数量的细致性及临床诊断符合率等方面予以比较。结果重复性：＂十二级法＂和＂四区划线法＂均较差,平均变异系数分别为22.45%和20.38%,但前者受操作等因素影响较小,结果差异多在1-2个档次之内;后者受操作等因素影响明显,同一标本的同种细菌为1＋4＋。区分细菌相对数量的细致性：＂无呼吸道炎症人群＂咽拭子的非厌氧菌半定量培养;若用＂十二级法＂判读,非β-溶血性链球菌、奈瑟菌、凝固酶阴性葡萄球菌、G-杆菌和酵母样真菌的平均携带量分别为0.45、0.35、〈0.1、〈0.1和〈0.1,差别显著;若用＂四区划线法＂判读,以上各菌却有可能差别不大。诊断符合率：对于痰培养的机会致病菌,若与涂片中白细胞区域优势菌对应以＂十二级法＂菌量〉该菌口咽部正常携带量为＂可疑感染菌＂判定标准,阳性率18.92%（521/2754）,与临床确诊加疑诊的符合率〉85%;若以其＂四区划线法＂菌量大于非β-溶血性链球菌菌量为＂可疑感染菌＂判定标准,则阳性率仅5.92%（163/2754）,漏诊较多。二者比较,2χ=213.94,P〈0.001。结论 ＂十二级法＂优于＂四区划线法＂,值得选用。

A new bacterial semi-quantitative culture method(12 degree classification method)

Objective The aim of this study is to establish a new hacterial semi-quantitative culture assay that could be suitable for non-homogeneous specimens.Methods Check the repeatability,meticulous of bacteria opposite quantity distinguished and clinical Applicability against traditionalfour zone streak plate cultivationwith non-respiratory inflammation throat swab and Sputum specimen of patients.Results Repeatability:C.V of12 degree classification methodandfour zone streak plate cultivationwere 22.45% and 20.38%...