简略快速法在大肠埃希菌鉴定中的应用价值研究

目的比较简略快速法与自动生化鉴定法在大肠埃希菌鉴定中的能力差异。方法使用快速简略鉴定法和自动生化鉴定法对临床标本分离的疑似大肠埃希菌进行鉴定,比较两种方法结果的一致性及检测时间。结果 492株疑似大肠埃希菌经快速鉴定法检出248株大肠埃希菌及244株非大肠埃希菌;该248株大肠埃希菌中,有231株被自动生化鉴定仪确认为大肠埃希菌,而244株非大肠埃希菌中,有7株被确认为大肠埃希菌。简略快速法阳性预测值及阴性预测值分别为93.1%(231/248)及97.1%(237/244)。使用自动生化鉴定法耗时2.5~7.0h,平均(4.12±1.08)h;使用简略快速法耗时0.5~2.0h,平均(1.08±0.45)h,差异具有统计学意义(t=-40.252,P0.001)。结论使用简略快速法鉴定疑似大肠埃希菌可以获得接近于自动生化鉴定法的结果,且更加节省时间。

Study of application value of simple-rapid method in Escherichia coli identification

Objective To compare the difference of simple-rapid identification method and automatic biochemical identification method in the identification of Escherichia coli .Methods The strains of Escherichia coli isolated from clinical samples were identi-fied by the simple-rapid method and automatic biochemical method .The consistency of result and the time of two methods were compared .Results Among 492 suspected strains ,248 strains were identified as Escherichia coli by simple-rapid method ,and other 244 strains were not .Meanwhile ,231 strains of these 248 Escherichia coli strains and 7 strains of 244 non Escherichia coli strains were identified as Escherichia coli by automatic biochemical method .The positive and negative predictive value of simple-rapid method were 93 .1% (231/248) and 97 .1% (237/244) .2 .5-7 .0 h average(4 .12 ± 1 .08) h] were used to identify Escherichia coli by automatic biochemical method while0 .5-2 .0 haverage(1 .08 ± 0 .45) h] were used by simple-rapid method ,the difference was statistically significant(t= -40 .252 ,P<0 .001) .Conclusion The result of simple-rapid method is close to that of automatic bio-chemical identification method on Escherichia coli ,and simple-rapid method used less time .