目的分析单核细胞增生李斯特菌(Listeria monocytogenes,LM)感染患者的病原学特点及临床特征,找到影响预后的因素,为临床早期诊治提供依据。方法通过电子病例系统查询北京、宁夏、苏州和广州等地区5家医院2011—2023年间临床分离的无菌...目的分析单核细胞增生李斯特菌(Listeria monocytogenes,LM)感染患者的病原学特点及临床特征,找到影响预后的因素,为临床早期诊治提供依据。方法通过电子病例系统查询北京、宁夏、苏州和广州等地区5家医院2011—2023年间临床分离的无菌体液和组织以及宫颈分泌物和耳道分泌物鉴定为LM患者的病例信息,并收集其菌株,回顾性分析LM病原学特点及感染者临床特征,探讨导致患者死亡的危险因素。结果共纳入68例患者病例,LM的感染以50岁以上的中老年患者居多(51.47%);感染部位以血流感染为主(51.85%),主要临床表现为发热;其次是颅内感染(24.0%),主要临床表现为发热、头晕、头痛、意识模糊和感染性休克等,整体死亡率达到23.53%。存活组C反应蛋白(CRP)[58.77(5.1~183)mg/L vs 89.08(12.4~272.7)mg/L,P=0.027]和降钙素原(PCT)[2.88(0.04~55.50)ng/L vs 12.35(0.19~38.56)ng/L,P=0.020]均明显低于死亡组。早期抗生素的选择对患者的生存率具有显著影响(P=0.008)。结论LM感染死亡率较高,年龄分布以中老年患者为主,感染部位以血流感染和颅内感染为主,不同的感染部位具有不同的临床表现,以发热最为常见。CRP和PCT的升高程度与患者的生存率呈负相关。青霉素、氨苄西林、复方磺胺甲恶唑、红霉素、美罗培南对LM都具有很高的体外抑菌,但复方磺胺甲恶唑不适用于孕妇和新生儿,尽早使用有效灭活LM的抗生素,对提高患者生存率极其重要。展开更多
Objective The detection of RNA single nucleotide polymorphism(SNP)is of great importance due to their association with protein expression related to various diseases and drug responses.At present,splintR ligase-assist...Objective The detection of RNA single nucleotide polymorphism(SNP)is of great importance due to their association with protein expression related to various diseases and drug responses.At present,splintR ligase-assisted methods are important approaches for RNA direct detection,but its specificity will be limited when the fidelity of ligases is not ideal.The aim of this study was to create a method to improve the specificity of splintR ligase for RNA detection.Methods In this study,a dualcompetitive-padlock-probe(DCPLP)assay without the need for additional enzymes or reactions is proposed to improve specificity of splintR ligase ligation.To verify the method,we employed dual competitive padlock probe-mediated rolling circle amplification(DCPLP-RCA)to genotype the CYP2C9 gene.Results The specificity was well improved through the competition and strand displacement of dual padlock probe,with an 83.26%reduction in nonspecific signal.By detecting synthetic RNA samples,the method demonstrated a dynamic detection range of 10 pmol/L-1 nmol/L.Furthermore,clinical samples were applied to the method to evaluate its performance,and the genotyping results were consistent with those obtained using the qPCR method.Conclusion This study has successfully established a highly specific direct RNA SNP detection method,and provided a novel avenue for accurate identification of various types of RNAs.展开更多
文摘目的分析单核细胞增生李斯特菌(Listeria monocytogenes,LM)感染患者的病原学特点及临床特征,找到影响预后的因素,为临床早期诊治提供依据。方法通过电子病例系统查询北京、宁夏、苏州和广州等地区5家医院2011—2023年间临床分离的无菌体液和组织以及宫颈分泌物和耳道分泌物鉴定为LM患者的病例信息,并收集其菌株,回顾性分析LM病原学特点及感染者临床特征,探讨导致患者死亡的危险因素。结果共纳入68例患者病例,LM的感染以50岁以上的中老年患者居多(51.47%);感染部位以血流感染为主(51.85%),主要临床表现为发热;其次是颅内感染(24.0%),主要临床表现为发热、头晕、头痛、意识模糊和感染性休克等,整体死亡率达到23.53%。存活组C反应蛋白(CRP)[58.77(5.1~183)mg/L vs 89.08(12.4~272.7)mg/L,P=0.027]和降钙素原(PCT)[2.88(0.04~55.50)ng/L vs 12.35(0.19~38.56)ng/L,P=0.020]均明显低于死亡组。早期抗生素的选择对患者的生存率具有显著影响(P=0.008)。结论LM感染死亡率较高,年龄分布以中老年患者为主,感染部位以血流感染和颅内感染为主,不同的感染部位具有不同的临床表现,以发热最为常见。CRP和PCT的升高程度与患者的生存率呈负相关。青霉素、氨苄西林、复方磺胺甲恶唑、红霉素、美罗培南对LM都具有很高的体外抑菌,但复方磺胺甲恶唑不适用于孕妇和新生儿,尽早使用有效灭活LM的抗生素,对提高患者生存率极其重要。
文摘Objective The detection of RNA single nucleotide polymorphism(SNP)is of great importance due to their association with protein expression related to various diseases and drug responses.At present,splintR ligase-assisted methods are important approaches for RNA direct detection,but its specificity will be limited when the fidelity of ligases is not ideal.The aim of this study was to create a method to improve the specificity of splintR ligase for RNA detection.Methods In this study,a dualcompetitive-padlock-probe(DCPLP)assay without the need for additional enzymes or reactions is proposed to improve specificity of splintR ligase ligation.To verify the method,we employed dual competitive padlock probe-mediated rolling circle amplification(DCPLP-RCA)to genotype the CYP2C9 gene.Results The specificity was well improved through the competition and strand displacement of dual padlock probe,with an 83.26%reduction in nonspecific signal.By detecting synthetic RNA samples,the method demonstrated a dynamic detection range of 10 pmol/L-1 nmol/L.Furthermore,clinical samples were applied to the method to evaluate its performance,and the genotyping results were consistent with those obtained using the qPCR method.Conclusion This study has successfully established a highly specific direct RNA SNP detection method,and provided a novel avenue for accurate identification of various types of RNAs.
