共查询到19条相似文献,搜索用时 62 毫秒
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目的:研究不同剂量的5种国内益生菌菌株(长双歧杆菌6-1株、婴儿双歧杆菌CGMCC313-1株、嗜酸乳杆菌YIT2004株、粪链球菌YIT0072株和酪酸梭状芽胞杆菌CGMCC313-2株)对脐血单核细胞(CBMC)的表达CD4、CD25的影响.方法:取7例健康孕妇的脐血分离出CBMC,分别与上述5种益生菌菌株,以菌和CBMC比例2:1(低)、20:1(中)和200:1(高)共培养24-36小时,同时设阴性对照(PBS)和阳性对照(脂多糖,LPS),采用流式细胞仪检测各组CBMC表面CD4CD25分子表达情况.结果:5种益生菌菌株中,除了高剂量的酪酸梭状芽胞杆菌株CGMCC313-2株组CBMC表达CD4CD25与阴性对照组表达有显著差异(P<0.01)外,其余益生菌组表达CD4CD25与阴性对照组无明显差别(P>0.05).结论:酪酸梭状芽胞杆菌CGMCC313-2株可影响Tn细胞分化为CD4+CD25+CBMC. 相似文献
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摘要 目的 了解医院重症监护病房(ICU)患者标本分离鲍曼不动杆菌分布及耐药特征。方法 采用细菌分离鉴定和药敏试验方法,对某医院ICU住院患者送检标本分离鲍曼不动杆菌分布及其耐药性进行检测,并与其他临床科室作比较分析。结果 全院共分离出鲍曼不动杆菌474株,其中ICU为221株,占检出总数的46.62%;神经外科占34.49%,仅次于ICU;各科室分离的鲍曼不动杆菌主要来源于痰标本;ICU患者标本检出的鲍曼不动杆菌中多重耐药菌株比例高于其他科室,且检出率呈现增加趋势;临床分离的鲍曼不动杆菌对临床常用抗菌药物普遍耐药,耐药率大多超过50%,仅对替加环素较敏感,其中对阿莫西林、头孢西丁、氨苄西林、头孢唑林及呋喃妥因等抗菌药物耐药率均达100%。结论 该医院ICU患者鲍曼不动杆菌感染率居各临床科室之首,主要为呼吸道感染,多重耐药菌株比例较高,提示应严密监控和加强防范措施。 相似文献
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J M Swenson C Thornsberry L M McCroskey C L Hatheway V R Dowell Jr 《Antimicrobial agents and chemotherapy》1980,18(1):13-19
A total of 224 strains of Clostridium botulinum (including isolates from 14 patients with infant botulism and 4 with wound botulism) and 15 strains of C. sporogenes were tested by agar dilution for susceptibility to tetracycline, metronidazole, erythromycin, penicillin, rifampin, chloramphenicol, clindamycin, cephalothin, cefoxitin, vancomycin, sulfamethoxazole-trimethoprim, nalidixic acid, and gentamicin. At least 90% of the C. botulinum strains tested (except for nonproteolytic strains of toxin type F with penicillin) were susceptible to all drugs except sulfamethoxazole-trimethoprim, nalidixic acid, and gentamicin. Minimal inhibitory concentrations for strains from patients with infant and wound botulism were similar to those for other C. botulinum strains. 相似文献
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目的 研究四川省自贡市食品和环境样本中屎肠球菌耐药性及携带毒力基因情况,并对分离菌株进行序列分型(ST)。方法 对2013年采集的157份食品和环境样本进行屎肠球菌分离鉴定,全自动微生物鉴定仪检测屎肠球菌对14种常见抗生素的敏感性;使用聚合酶链式反应方法检测屎肠球菌携带毒力基因(hyl,esp)的情况,并应用多位点序列分型(MLST)方法对分离菌株进行序列分型。结果 自贡地区肉制品和冰箱拭子样本屎肠球菌分离率为28.03%(44/157),其中耐药菌株的比例为86.36%(38/44)。分离菌株对红霉素、四环素和利福平的耐药率分别为65.91%(29/44)、31.82%(14/44)和27.27%(12/44),对环丙沙星,高浓度链霉素和高浓度庆大霉素以及氯霉素也有一定的耐药率。分离到1株喹奴普丁-达福普丁耐药的菌株。未检测到对青霉素类、糖肽类、脂肽类、喹诺酮类和恶唑烷酮类抗生素耐药的菌株。44株屎肠球菌分为38个ST型别,ST94克隆群为优势克隆群,包括13株菌。分离到1株CC17克隆群的屎肠球菌多重耐药菌株和1株ST957的八重耐药菌株。检测到2株携带esp基因的屎肠球菌。结论 自贡市食品和环境中存在多种ST型别的屎肠球菌,且对多种抗生素耐药。应重视肉制品中耐药屎肠球菌对公众健康的潜在威胁。 相似文献
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In vitro activities of daptomycin,vancomycin, quinupristin- dalfopristin,linezolid, and five other antimicrobials against 307 gram-positive anaerobic and 31 Corynebacterium clinical isolates
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Goldstein EJ Citron DM Merriam CV Warren YA Tyrrell KL Fernandez HT 《Antimicrobial agents and chemotherapy》2003,47(1):337-341
The activities of daptomycin, a cyclic lipopeptide, and eight other agents were determined against 338 strains of gram-positive anaerobic bacteria and corynebacteria by the NCCLS reference agar dilution method with supplemented brucella agar for the anaerobes and Mueller-Hinton agar for the corynebacteria. The daptomycin MICs determined on Ca(2+)-supplemented (50 mg/liter) brucella agar plates were one- to fourfold lower than those determined in unsupplemented media. Daptomycin was highly active (MICs, 8 microg/ml were inhibited by <1 microg of daptomycin per ml. Daptomycin MICs were >or=4 microg/ml for most strains of Clostridium clostridioforme, Clostridium paraputrificum, Clostridium tertium, and Clostridium ramosum; the isolates were generally more resistant to other antimicrobials. Daptomycin was two- to fourfold less active against Actinomyces spp. than vancomycin, quinupristin-dalfopristin, or linezolid. Twenty-nine of 31 strains of Corynebacterium spp., including Corynebacterium jeikeium, Corynebacterium amycolatum, and Corynebacterium pseudodiphtheriticum, were inhibited by 相似文献
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目的调查婴儿艰难梭菌的携带状况及菌株特征。方法收集2015年8-11月在该院住院或门诊治疗的1岁内婴儿粪便标本238份,利用免疫层析法快速初筛艰难梭菌,阳性标本再利用CDIF平板进行厌氧培养以获得菌株,利用PCR方法检测艰难梭菌毒素A、B的编码基因tcdA、tcdB和二元毒素编码基因cdtA、cdtB,运用slpA测序分型(slpA ST)方法对菌株进行基因分型。结果 238份粪便标本共分离出50株艰难梭菌,3月、3~6月和6月至1岁三组婴儿艰难梭菌的分离率分别为9.3%,17.6%和27.3%,三组见比较差异有统计学意义(χ~2=6.940,P=0.0310.05)。52.0%(26/50)的菌株为产毒株,其中69.2%(18/26)的菌株产毒模式为tcdA+tcdB+cdtA-cdtB-。50株艰难梭菌可分为11种slpA ST型,产毒株最常见的基因型为slpA ST fr-02和kr-02,而非产毒株则为xr-03。结论 1岁内婴儿艰难梭菌携带率较高,且过半为产毒株,大多同时产毒素A和B。产毒株与非产毒株的基因型存在差别。 相似文献
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The minimal inhibitory concentrations of 21 antimicrobial agents were determined by an agar dilution method against 68 strains of 18 Clostridium species isolated from caeca of pigs, cattle and poultry. Of the therapeutically used antibiotics, chloramphenicol was most active in vitro followed by penicillin G, the lincosamides and tetracycline. Penicillin-resistant Cl. butyricum strains produced a beta-lactamase. Avoparcin, carbadox, monensin, nitrovin and virginiamycin were the most effective of the growth promoting antimicrobial agents. Many clostridial species were naturally resistant to flavomycin and Cl. sporogenes was naturally resistant additionally to bacitracin, tiamulin, the lincosamides and virginiamycin component M. The macrolide, lincosamide and streptogramin resistant strains showed four different patterns of resistance to the antibiotics. One of these resistance patterns was the natural resistance of Cl. sporogenes to the lincosamides and virginiamycin component M which is a streptogramin group A antibiotic. 相似文献
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Vela M Heredia NL Feng P Santos García-Alvarado J 《Diagnostic microbiology and infectious disease》1999,35(2):101-104
Clostridium perfringens has been implicated as a causative agent of foodborne poisoning, infectious diarrhea (not associated with foods), gas gangrene, and several veterinary diseases. Fecal carriage of enterotoxigenic strains of this bacterium appears to be important in the development of infectious diarrhea and as a source of C. perfringens contamination of foods. In this work, carriage of this bacterium in feces of a Mexican population was analyzed. C. perfringens was found in 126 of the 200 fecal samples obtained from healthy individuals from northern Mexico. The samples had an average of 7.4 x 10(3) spores per gram, with the elderly population showing the highest levels. Dot blot analyses using a dig-labeled probe specific for the enterotoxin gene showed that 7% of the samples had isolates with toxigenic potential. 相似文献
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