尿路感染中肠球菌的分布及耐药性分析

Distribution and drug resistance of Enterococcus in urinary tract infection

  • 摘要: 目的 探讨尿标本中肠球菌的分布特点和耐药性。方法 选取2014年1月-2015年12月2 872例尿路感染患者, 对尿液病原菌进行鉴定及药物敏感性试验,耐药率分析采用χ2检验或Fisher精确概率检验。结果 2 872例尿标本中分离病原菌2 872株,革兰阴性菌2 053株,占71.5%;革兰阳性菌749株,占26.1%;真菌70株,占2.4%,检出病原菌最多的前5位依次为大肠埃希菌1 399株、粪肠球菌304株,肺炎克雷伯菌171株、屎肠球菌109株、铜绿假单胞菌94株,依次占比为48.7%、10.6%、6.0%、3.8%、3.3%;男性、女性、门诊、住院、泌尿科、肾内科患者分离的病原菌分别占34.5%、65.5%、4.1%、95.9%、39.7%、23.4%,屎肠球菌对青霉素、氨苄西林、环丙沙星、左氧氟沙星、红霉素等耐药率很高,均在80%以上;粪肠球菌对红霉素耐药率最高,对青霉素、氨苄西林、呋喃妥因耐药率很低,粪肠球菌对青霉素、氨苄西林、高浓度庆大霉素、环丙沙星、左氧氟沙星、红霉素、呋喃妥因等耐药率显著低于屎肠球菌;未发现对万古霉素、替考拉宁及利奈唑胺耐药的肠球菌。结论 尿路感染以大肠埃希菌、肠球菌最常见,肠球菌耐药情况严重,不同肠球菌种间耐药性差异明显,应根据鉴定及药敏结果合理使用抗菌药物。

     

    Abstract: OBJECTIVE To explore the distribution and drug resistance of Enterococcus isolated from urine specimens. METHODS A total of 2 872 patients with urinary tract infection who were treated in the hospital from Jan 2014 to Dec 2015 were enrolled in the study. The pathogens isolated from the urine specimens were identified, the drug susceptibility testing was performed, and the drug resistance was analyzed via chi-square test or Fisher's exact test. RESULTS Totally 2872 strains of pathogens were isolated from 2872 urine specimens, including 2 053 (71.5%) strains of gram-negative bacteria, 749 (26.1%) strains of gram-positive bacteria, and 70 (2.4%) strains of fungi. The top 5 species of isolated pathogens were in turn as follows: Escherichia coli (1399 strains, 48.7%), Enterococcus faecalis (304 strains, 10.6%), Klebsiella pneumoniae (171 strains, 6.0%), Enterococcus faecium (109 strains, 3.8%), Pseudomonas aeruginosa (94 strains,3.3%). Of the isolated pathogens, 34.5% were isolated from male patients, 65.5% from female patients, 4.1% from outpatient department patients, 95.9% from hospitalized patients, 39.7% from urology department patients, 23.4% from nephrology department patients. The drug resistance rates of the E.faecium to penicillin, ampicillin, ciprofloxacin, levofloxacin, and erythromycin were more than 80%; the drug resistance rate of the E.faecalis to erythromycin was highest, while the drug resistance rates to penicillin, ampicillin, and nitrofurantoin were very low; the drug resistance rates of the E.faecalis to penicillin, ampicillin, high concentration of gentamicin, levofloxacin, erythromycin, and nitrofurantoin were significantly lower than those of the E.faecium. The Enterococcus strains that were resistant to vancomycin, teicoplanin, or linezolid were not found. CONCLUSION The E.coli and Enterococcus are the most common species of pathogens causing the urinary tract infection. The Enterococcus strains are highly drug-resistant. The different species of Enterococcus have significantly varied drug resistance. It is necessary to reasonably use antibiotics based on the results of bacterial identification and drug susceptibility testing.

     

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