多重PCR检测霍乱弧菌RTX毒力基因

目的：探索建立一种快速、敏感的诊断方法，用于检测霍乱弧菌RTX毒力基因。方法：针对霍乱弧菌霍乱肠毒素A亚单位基因（ctxA）、RTX毒素家族的细胞毒素基因（rtxA）和毒素激活子基因（rtxC）分别设计3对引物，建立多重PCR方法；用Hep-2细胞测毒方法检测rtxA、rtxC阳性菌株毒素的表达。结果：所有183株临床和环境中分离的霍乱弧菌中，PCR和Hep-2细胞测毒法RTX毒素均为阳性，而古典生物型标准株（569B）二者均为阴性。结论：该方法快速、特异、敏感，具有较大的应用价值。     

入境船舶饮用水致病性孤菌污染与相关因素

目的：了解珠海口岸入境船舶上饮用水中致病性弧菌污染状况，以及其与船舶卫生管理和卫生处理措施等方面的关系，为检验检疫执法工作和政策的制定提供依据。方法：采集珠海港入境船舶饮用水，对水样进行弧菌科的分离鉴定，并对调查资料进行统计和分析。结果：入境船舶上的饮用水34份，9份检出致病性弧菌，检出率26．47％；检出6种致病性弧菌；船舶卫生状况不同时，其饮用水中致病性弧菌检出率差异有显著性。结论：入境船舶上的饮用水被致病性弧菌污染较严重。有“海水化淡”设备的船舶，可能对降低其饮用水中致病性弧菌检出率有一定作用。建议对入境船舶饮用水的排放加强管理，制定有效的检疫监管措施。     

非可培养状态霍乱弧菌的间接免疫荧光检测

目的建立检测水中活的非可培养状态霍乱弧菌(O1群、O139群)的间接免疫荧光法。方法用本实验室人工转化的非可培养状态霍乱弧菌的菌液制成抗原片,用混合诊断血清(抗O1群、O139群)作为一抗,异硫氰酸荧光素(FITC)标记猪抗兔IgG作为二抗,进行间接免疫荧光检测。结果该方法可以成功检测出水中非可培养状态霍乱弧菌,其检测下限约为104cells/400 ml。结论该方法具有较好的特异性和灵敏度,可作为自然水体中非可培养状态霍乱弧菌的检测方法,用于霍乱弧菌的生态研究。     

Non-01 Vibrio cholerae septicemia and meningitis in a neonate

Non-01 Vibrio cholerae is known to cause diarrhoea as well as extra-intestinal infections in adults and children. However meningitis in children is a rare occurrence. We report a neonate who developed septicemia and meningitis due toNon-01 Vibrio cholerae.     

治疗前后酒精灌胃大鼠创伤弧菌脓毒症肝组织Toll样受体等的变化

目的 探讨抗生素对酒精灌胃大鼠创伤弧菌(vibrio vulnificus,VV)脓毒症肝组织Toll样受体(Toll like receptor,TLR)等的影响.方法 大鼠设正常对照组(N组,6只)、酒精灌胃大鼠对照组(A组,6只)、酒精灌胃大鼠抗生素对照组(AA组,6只)、酒精灌胃大鼠VV脓毒症组(AV组,24只;分别于染菌后2、6、12、24 h处死,每时相点动物数均为6只)和酒精灌胃大鼠VV脓毒症抗生素治疗组(AVA组,30只;分别于染菌后6、12、24、36 h和1周时活杀,各时相点动物数均为6只).采用逆转录聚合酶链技术检测各组大鼠不同时点肝组织TLR等的变化.结果 AV-6 h组TLR4 mRNA表达量为0.775±0.101,AVA-6 h组TLR4 mRNA表达量为0.600±0.064;AV-12 h组TLR4 mRNA表达量为0.918±0.133,AVA-12 h组TLR4 mRNA表达量为0.583±0.112;AV-24 h组TLR4 mRNA表达量为0.732±0.110,AVA-24 h组TLR4 mRNA表达量为0.512±0.118.AVA组大鼠染菌后6、12、24h TLR4 mRNA,与同时点AV组相比,TLR4 mRNA表达量明显降低,差异有统计学意义(AVA-6 h组与AV-6 h组比较,t=-3.573,P＜0.01;AVA-12 h组与AV-12 h组比较,t=-4.722,P＜0.01;AVA-24 h组与AV-24 h组比较,t=-3.340,P＜0.01).结论 及早联用抗生素可减低酒精灌胃大鼠VV脓毒症肝组织TLR等的表达,有利于机体促、抗炎平衡恢复,对酒精灌胃大鼠VV脓毒症有明显的治疗作用.     

Vibrio vulnificus endophthalmitis occurring after ingestion of raw seafood

Ocular Vibrio vulnificus infections are quite rare, and all previously reported cases have been associated with exposure to seafood and seawater. Here, we report a case of endogenous endophthalmitis caused by V. vulnificus, occurring after the ingestion of raw seafood. This case was not associated with any cutaneous or other severe systemic manifestations.     

Biological effects of imidazolium ionic liquids with varying chain lengths in acute Vibrio fischeri and WST-1 cell viability assays

Detailed biological studies of methyl- and some ethylimidazolium ionic liquids in luminescent bacteria as well as in the IPC-81 (leukemia cells) and C6 (glioma cells) rat cell lines are presented. Effective concentrations in these test systems are generally some orders of magnitude lower than effective concentrations [corrected] of the conventional solvents acetone, acetonitrile, methanol, and methyl t-butyl ether. No general influence of the anionic compound in the ionic liquids on toxicity could be found, although they seem to modulate toxicity in some cases. The clear influence of the alkyl chain length on toxicity was quantified by linear regression analysis. Alkyl chain length of the longer alkyl chain was varied from 3 to 10 carbon atoms. Consequences for a design of sustainable alternative solvents are briefly sketched.     

Translocation of protein kinase-C with IP3-induced calcium mobilization by heat-stable enterotoxin of Vibrio cholerae non-O1 in isolated rat enterocytes

The activity of the calcium- and phospholipid-dependent enzyme protein kinase C (PKC) in response to heat-stable enterotoxin (NAG-ST) of Vibrio cholerae non-O1 was examined in isolated rat enterocytes. Optimal stimulation of the membrane-bound PKC activity (about 4.3-fold) was observed after 1 min of incubation of cells with 10 ng/ml toxin; and the effects were dose dependent. Following NAG-ST treatment an increase in PKC activity in the membrane fraction was found with a concomitant decrease in the cytosolic fraction suggesting the redistribution of the enzyme. The pronounced enzyme activity in presence of a classical pseudosubstrate and its complete inhibition by G? 6976 suggested the involvement of a calcium-dependent isoform of PKC (PKC-alpha). A time course study employing an immunoblot assay provided evidence that NAG-ST led to almost complete translocation of PKC-alpha to the membrane. A 65% inhibition of enzyme activity in the membrane fraction and inhibition of its translocation to some extent by dantrolene treatment further suggested that the enzyme was translocated with the rise of intracellular calcium ([Ca2+]i). The phosphorylation of three membrane proteins by toxin-induced PKC in vitro and abolition of this phosphorylation by G? 6976 demonstrated that phosphorylation of these membrane proteins was PKC-alpha mediated and might be involved in the alteration of membrane functions.     

The presence and antimicrobial susceptibilities of human-pathogen Vibrio spp. isolated from blue crab (Callinectes sapidus) in Belek tourism coast,Turkey

Monitoring of Vibrio species by blue crabs (Callinectes sapidus) was carried out during the winter period in a selected area of the Belek, Antalya Gulf. Eighty-three blue crabs were examined for Vibrio species. V. alginolyticus (30.1%), V. fluvialis (10.8%), V. damsela (9.6%), V. harveyi (3.6%), V. metschnikovii (3.6%) and V. vulnificus (2.4%) were isolated. V. vulnificus was the highest concentration (5 x 10(8) Vibrio ml(-1)) although it was only 2.4% isolated from blue crabs. The strains of different vibrio species were highly susceptible to doxycycline, tetracycline and ciprofloxacin.