Investigation of bacteria toxins and bacteria invasion proteases and capsular antigen associated genes distribution of Staphylococcus aureus isolated from burn ward
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摘要: 目的 了解烧伤患者金黄色葡萄球菌分离株的细胞毒素、侵袭毒素和荚膜抗原基因携带状况,以指导临床更有效地治疗金黄色葡萄球菌感染。 方法 收集2013年7—12月宁波市第二医院烧伤病房创面及留置导管来源的金黄色葡萄球菌,通过Vitek-2compact全自动鉴定仪上机及葡萄球菌A蛋白PCR基因表达鉴定菌株,PCR方法分析10种细胞毒素基因(hla、hlb、hld、hlg、hlg-2、pvl、lukE、lukM、psm-mec、psm-α)、9种侵袭毒素基因(ssp、splB、edinA、edinB、edinC、sak、hysA、lip、nuc)及2种荚膜抗原基因(cap5、cap8)。 结果 20株金黄色葡萄球菌中细胞毒素基因hla检出率为85.0%;hlg-2检出率为80.0%;psm-α检出率为70.0%;lukE检出率为55.0%;pvl检出率为15.0%;hlb检出率为10.0%;hld、hlg、lukM、psm-mec基因未检出;侵袭毒素基因lip和nuc检出率为90.0%;splB检出率为60.0% hysA检出率为20.0%;ssp、edinA、edinB、edinC、sak未检出,荚膜抗原基因cap5、cap8检出率分别为30.0%和70.0%。 结论 该研究中20株金黄色葡萄球菌细胞毒素基因与侵袭毒素基因高检出率可能与创面或伤口久治不愈相关。Abstract: Objective To investigate bacteria toxins and bacteria invasion proteases and capsular antigen associated genes distribution of Staphylococcus aureus isolated from burn ward. Methods Staphylococcus aureus were isolated from our unit from July to December 2013,and ten bacteria toxins associated gens(hla,hlb,hld,hlg,hlg-2,pvl,lukE,lukM,psm-mec,psm-α),nine bacteria invasion associated proteases (ssp,splB,edinA,edinB,edinC,sak,hysA,lip,nuc) and two capsular antigen associated gens(cap5,cap8) were amplified through PCR technique. Results Among 20 strains of Staphylococcus aureus,the positive rate of hla was 85.0%,hlg-2 was 80.0%,psm-α was 70.0%,lukE was 55.0%,pvl was 15.0%,hlb was 10.0%,hld,hlg,lukM and psm-mec were all 0%;of lip and nuc was 90.0%,splB was 60.0%,hysA was 20.0%,ssp,edinA,edinB,edinC and sak was 0%;of cap5 and cap8 was 30.0% and 70.0%,respectively. Conclusion In this research,the high positive rate of bacteria toxins associated gens and bacteria invasion associated proteases expression rate in 20 strains of Staphylococcus aureus may associate with delay wound healing.
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