1H nuclear magnetic resonance-based metabolic profiling of cerebrospinal fluid to identify metabolic features and markers for tuberculosis meningitis

BackgroundTuberculosis meningitis (TBM) is the most severe form of tuberculosis, and currently lacks efficient diagnostic approaches. Metabolomics has the potential to differentiate patients with TBM from those with other forms of meningitis and meningitis-negative individuals. However, no systemic metabolomics research has compared the cerebrospinal fluid (CSF) of these patients.Methods¹H nuclear magnetic resonance (NMR) was used for CSF metabolic profiling. Principal component analysis and orthogonal signal correction-partial least squares-discriminant analysis (OPLS-DA) were used to screen for important variables. The Human Metabolome Database was used to identify metabolites, and MetaboAnalyst 4.0 was used for pathway analysis and over-representation analysis.ResultsOPLS-DA modeling could distinguish TBM from other forms of meningitis, and several significantly changed metabolites were identified. Additionally, 23, 6, and 21 metabolites were able to differentiate TBM from viral meningitis, bacterial meningitis, and meningitis-negative groups, respectively. Pathway analysis indicated that these metabolites were mainly involved in carbohydrate and amino acid metabolism, and over-representation analysis indicated that some of these pathways were over-represented.ConclusionsThe metabolites identified have the potential to serve as biomarkers for TBM diagnosis, and carbohydrate and amino acid metabolism are perturbed in the CSF of patents with TBM. Metabolomics is a valuable approach for screening TBM biomarkers. With further investigation, the metabolites identified in this study could aid in TBM diagnosis.     

自然疫源性疾病流行因素分析及对策

目的总结和分析我国1991-2006年重点自然疫源性疾病的流行现状和分布情况,探讨新时期疫情的影响因素,提出加强自然疫源性疾病监测建议。方法收集1991-2006年全国鼠疫、肾综合征出血热(HFRS)、狂犬病、流行性乙型脑炎(乙脑)、钩端螺旋体病(钩体病)、布鲁氏菌病(布病)、登革热、疟疾等重点自然疫源性疾病的疫情监测资料并进行统计分析。结果1991-2006年全国鼠疫、HFRS、狂犬病、乙脑、钩体病、布病、登革热、疟疾等报告病例1 859 295例,死亡39 028例,发病比例由20世纪90年代初期的7%左右降至2%,下降近70%,死亡比例则由50%降至目前的40%左右,所占比重依然较大;疫情主要集中在我国南方温带和亚热带地区,呈现出南多北少的特点。全球气候变暖、媒介和宿主动物入侵与耐药性、生态环境变化以及畜牧养殖业和其相关产品加工产业的高速发展等因素是目前自然疫源性疾病疫情的影响因素。结论在监测工作中重点加强预警监测、免疫接种和防制策略的效果评价以及媒介生物和宿主动物综合治理等的研究。     

Comparative proteomic analysis of Vibrio cholerae O139, O22, O155 and El Tor biotype epidemic strains

Cholera ,as one of the most severe epidemic dis-eases inthe world,can occurin a short time ,andspread quicklyto a wide region.Until 1992 ,onlyV.choleraeserogroup O1 was recognized as thecause of epidemic cholera . However in October1992 ,a major outbreak of a cholera-like illnesscaused by a newserogroupstrain ofV.choleraee-mergedinIndia and Bangladesh.In contrast to allpreviously reported non-O1 strains , which induceonly sporadic cases of human diarrhea without epi-demic potential ,the new…     

Specific immunoglobulin g antibody detected in umbilical blood and amniotic fluid from a pregnant woman infected by the coronavirus associated with severe acute respiratory syndrome

Specific immunoglobulin G antibody for severe acute respiratory syndrome (SARS) coronavirus was detected in maternal blood, umbilical blood, and amniotic fluid from a pregnant SARS patient. Potential protection of fetus from infection was suggested.     

霍乱弧菌溶原性噬菌体CTXΦ的氯霉素抗性基因标记及诱导

目的　对携带霍乱毒素基因的溶原性噬菌体CTXΦ进行遗传标记 ,以深入研究CTXΦ对霍乱弧菌的转染机制。方法　将CTXΦ基因组中ctxAB的上下游同源序列连接到cat基因的两侧 ,然后通过自杀质粒介导的DNA同源重组技术将霍乱菌株N16 96 1染色体上CTXΦ基因组中的ctxAB基因缺失掉 ,替换以氯霉素抗性基因 ,对CTXΦ基因组进行遗传标记 ,然后用丝裂霉素C诱导这种经抗性基因标记的噬菌体 ,再利用它对古典型霍乱弧菌的转染检测活性。结果　获得了ctxAB缺失、带有cat遗传标记的重组菌株N Φc;诱导出的CTXΦc噬菌体颗粒成功感染了霍乱菌株 1119。结论　N Φc中的CTXΦ带有了氯霉素抗性标记 ,诱导出具有感染活性的CTXΦc可用于研究毒力基因的水平转移     

我国5岁以下儿童小肠结肠炎耶尔森菌感染临床特征及病原学分析

目的 了解我国5岁以下儿童小肠结肠炎耶尔森菌腹泻病例临床与病原学特征,分析其可能的感染来源,为小肠结肠炎耶尔森菌病的防控与诊断提供科学依据。 方法 收集2010—2020年间来自全国10个省市自治区哨点医院儿童腹泻标本、调查及回访问卷;对标本进行小肠结肠炎耶尔森菌的分离鉴定;菌株进行生物分型、血清型鉴定;毒力基因检测以及脉冲场凝胶电泳(pulsed field gel electrophoresis,PFGE)分型。 结果 2010—2020年共监测11 377例,分离到致病性小肠结肠炎耶尔森菌63株,包括61株O:3血清型、2株O:9血清型菌株,5岁以下腹泻儿童感染率0.55%(63/11 377)。不同性别儿童对致病性小肠结肠炎耶尔森菌的感染率差异无统计学意义,1～5岁感染率高于≤1岁病例(χ²=44.836,P＜0.05),感染患儿中1～5岁发热比例高于≤1岁(χ²=11.508 ,P<0.05),随访病例未发现后遗症。我国儿童感染O:3血清型致病性小肠结肠炎耶尔森菌的PFGE带型存在多样性,优势带型为K6GN11C30021、K6GN11C30012。 结论 我国5岁以下儿童感染致病性小肠结肠炎耶尔森菌的生物血清型以3/O:3为主,偶有4/O:3与2/O:9。根据患儿感染特点与高发季节推测食源为主要感染来源,需进一步调查研究。     

First molecular detection of Anaplasma species in cattle from Kyrgyzstan; molecular identification of human pathogenic novel genotype Anaplasma capra and Anaplasma phagocytophilum related strain

Anaplasmosis is a rickettsial infection with significant effects on human and animal health, and the discovery of new species or genotypes with zoonotic potential in recent years has increased this importance. The aim of this study was to provide the first assessment of the molecular etiology and prevalence of bovine anaplasmosis in Kyrgyzstan (specifically in the Chuy, Talas, Djalal-Abad, Naryn, and Issyk-Kul regions). The prevalence of bovine anaplasmosis was determined as 1.7% (6/358). PCR and partial DNA sequencing results of the 16S ribosomal RNA (rRNA) gene revealed that Anaplasma centrale, A. phagocytophilum like-1, and the human pathogenic novel genotype A. capra are circulating in cattle herds in Kyrgyzstan. Six DNA nucleotide sequences obtained in this study were deposited in GenBank under the following accession numbers: A. centrale (MW672117, MW672118, MW672119, MW672120), A. phagocytophilum (MW672121), and A. capra (MW672115).