口咽部正常菌群对肺炎支原体快速培养法试剂盒的影响(1)
摘要:目的 观察常见的口咽部正常菌群对肺炎支原体快速培养法试剂盒结果的影响,评价其临床实用性和可靠性。方法 用标准菌株和口咽部分离的临床菌株作为研究对象,观察不同细菌对培养结果的影响。结果 标准菌株肺炎链球菌、金黄色葡萄球菌、流感嗜血杆菌、大肠埃希菌、白念珠菌在试剂盒中的培养阳性率分别为0,10.00%,10.00%,10.00%,20.00%,临床分离的野生型和耐药型草绿色链球菌培养阳性率分别为5.00%,80.00%;表皮葡萄球菌为15.00%,90.00%;肺炎克雷伯菌为25.00%,80.00%,白念珠菌为20.00%,85.00%;鲍曼不动杆菌为90.00%,100.00%。除鲍曼不动杆菌外其它四种耐药型菌株的培养阳性率明显增高。结论 口咽部若存在耐药菌或多重耐药菌以及对某些抗生素有天然耐药机制的细菌时会造成肺炎支原体快速培养法检测结果出现假阳性,在试验结果报告中应注意其假阳性的问题。
关键词:肺炎支原体;快速培养;假阳性
中图分类号:R446.6 文献标识码:A DOI:10.3969/j.issn.1006-1959.2019.11.053
, http://www.100md.com
文章编号:1006-1959(2019)11-0171-03
Abstract:Objective To observe the effect of common oropharyngeal normal flora on the results of the rapid culture method of Mycoplasma pneumoniae and evaluate its clinical applicability and reliability.Methods The clinical strains isolated from standard strains and oropharynx were used as research objects to observe the effects of different bacteria on the culture results. Results The positive rates of standard strains of Streptococcus pneumoniae, Staphylococcus aureus, Haemophilus influenzae, Escherichia coli and Candida albicans in the kit were 0, 10.00%, 10.00%, 10.00%, 20.00%, clinical The positive rates of isolated wild-type and drug-resistant S. cerevisiae cultures were 5.00% and 80.00%, respectively; Staphylococcus epidermidis was 15.00%, 90.00%; Klebsiella pneumoniae was 25.00%, 80.00%, and Candida albicans was 20.00%,85.00%; Acinetobacter baumannii was 90.00%, 100.00%. The positive rate of culture of the four drug-resistant strains except Acinetobacter baumannii was significantly increased.Conclusion If there are resistant or multi-drug resistant bacteria in the oropharynx and bacteria with natural resistance to certain antibiotics, the results of the rapid culture method of mycoplasma pneumoniae will be false positive, and the problem of false positives should be noted in the test results report.
, 百拇医药
Key words:Mycoplasma pneumoniae;Rapid culture;False positive
肺炎支原体(mycoplasma pneumonia,MP)可引起气管支气管炎和肺炎,学龄期儿童和青壮年是易感人群。这种感染在每3~7年间可呈现地区性或世界范围的流行。由于典型或非典型病原体引起的肺炎其临床表现和实验室检查结果会不同,并且临床常用的β内酰胺类抗生素对肺炎支原体无效,因此肺炎支原体肺炎获得病原学诊断非常重要[1]。研究显示,MP感染后 IgM抗体在1周后升高,在第3周达到峰值,其诊断MP敏感性为7.4%~33.3%,在部分成年患者中MP IgM可持续阴性。因此,如果将IgM检查作为唯一的实验室证据并不能提供正确的信息。与PCR方法相比时,收集呼吸道标本采用培养法检测MP敏感性为61.5%[2]。但是也有研究报道[3],培养方法诊断MP感染时其不敏感性不能接受。国内的一项研究报道[1],两种方法的阳性率没有区别。此外,诊断参数的价值包括特异性、敏感性、阳性和阴性预测值以及阳性似然比,培养法是3种方法中最高的[3]。然而,較长的培养时间影响了其临床应用价值。肺炎支原体快速培养法试剂盒其检测原理是样本洗脱在培养液中经适宜温度下恒温培养,若标本中含有肺炎支原体则快速繁衍增殖,通过快速生长,其代谢产物分解葡萄糖产酸,使介质pH值降低,培养基由红色变为黄色即为阳性。既往研究显示,肺炎支原体快速培养法比血清学检测有更高的假阳性率,有部分假阳性样本中能分离出一些临床常见的口腔正常菌群或致病菌。本研究旨在利用标准菌株和临床分离的耐药菌研究不同细菌对MP快速培养法结果是否有干扰作用,以及不同采样拭子对快速培养结果的影响。, 百拇医药(石连霞)
关键词:肺炎支原体;快速培养;假阳性
中图分类号:R446.6 文献标识码:A DOI:10.3969/j.issn.1006-1959.2019.11.053
, http://www.100md.com
文章编号:1006-1959(2019)11-0171-03
Abstract:Objective To observe the effect of common oropharyngeal normal flora on the results of the rapid culture method of Mycoplasma pneumoniae and evaluate its clinical applicability and reliability.Methods The clinical strains isolated from standard strains and oropharynx were used as research objects to observe the effects of different bacteria on the culture results. Results The positive rates of standard strains of Streptococcus pneumoniae, Staphylococcus aureus, Haemophilus influenzae, Escherichia coli and Candida albicans in the kit were 0, 10.00%, 10.00%, 10.00%, 20.00%, clinical The positive rates of isolated wild-type and drug-resistant S. cerevisiae cultures were 5.00% and 80.00%, respectively; Staphylococcus epidermidis was 15.00%, 90.00%; Klebsiella pneumoniae was 25.00%, 80.00%, and Candida albicans was 20.00%,85.00%; Acinetobacter baumannii was 90.00%, 100.00%. The positive rate of culture of the four drug-resistant strains except Acinetobacter baumannii was significantly increased.Conclusion If there are resistant or multi-drug resistant bacteria in the oropharynx and bacteria with natural resistance to certain antibiotics, the results of the rapid culture method of mycoplasma pneumoniae will be false positive, and the problem of false positives should be noted in the test results report.
, 百拇医药
Key words:Mycoplasma pneumoniae;Rapid culture;False positive
肺炎支原体(mycoplasma pneumonia,MP)可引起气管支气管炎和肺炎,学龄期儿童和青壮年是易感人群。这种感染在每3~7年间可呈现地区性或世界范围的流行。由于典型或非典型病原体引起的肺炎其临床表现和实验室检查结果会不同,并且临床常用的β内酰胺类抗生素对肺炎支原体无效,因此肺炎支原体肺炎获得病原学诊断非常重要[1]。研究显示,MP感染后 IgM抗体在1周后升高,在第3周达到峰值,其诊断MP敏感性为7.4%~33.3%,在部分成年患者中MP IgM可持续阴性。因此,如果将IgM检查作为唯一的实验室证据并不能提供正确的信息。与PCR方法相比时,收集呼吸道标本采用培养法检测MP敏感性为61.5%[2]。但是也有研究报道[3],培养方法诊断MP感染时其不敏感性不能接受。国内的一项研究报道[1],两种方法的阳性率没有区别。此外,诊断参数的价值包括特异性、敏感性、阳性和阴性预测值以及阳性似然比,培养法是3种方法中最高的[3]。然而,較长的培养时间影响了其临床应用价值。肺炎支原体快速培养法试剂盒其检测原理是样本洗脱在培养液中经适宜温度下恒温培养,若标本中含有肺炎支原体则快速繁衍增殖,通过快速生长,其代谢产物分解葡萄糖产酸,使介质pH值降低,培养基由红色变为黄色即为阳性。既往研究显示,肺炎支原体快速培养法比血清学检测有更高的假阳性率,有部分假阳性样本中能分离出一些临床常见的口腔正常菌群或致病菌。本研究旨在利用标准菌株和临床分离的耐药菌研究不同细菌对MP快速培养法结果是否有干扰作用,以及不同采样拭子对快速培养结果的影响。, 百拇医药(石连霞)