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https://www.readbyqxmd.com/read/28648624/extended-spectrum-%C3%AE-lactamases-and-plasmid-mediated-quinolone-resistance-in-enterobacterial-clinical-isolates-from-neonates-in-tunisia
#1
Karama Charfi, Raoudha Grami, Abir Ben Jeddou, Aziza Messaoudi, Yosra Mani, Olfa Bouallegue, Noureddine Boujaafar, Mahjoub Aouni, Hedi Mammeri, Wejdène Mansour
This study was conducted to investigate extended-spectrum-β-lactamase (ESBL) producing Enterobacteriaceae isolates from the Center of Maternity and Neonatology of Monastir, Tunisia. Fourty-six strains out of 283 were found to produce ESBL: Klebsiella pneumoniae (n = 37), Escherichia coli (n = 6), Enterobacter cloacae (n = 2), and Citrobacter freundi (n = 1). Genotyping analysis, using ERIC2 and RAPD, showed that strains were clonally unrelated. PCR amplification followed by sequencing revealed that all strains produced CTX-M-15...
June 22, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28637162/response-of-antimicrobial-nitrofurazone-degrading-biocathode-communities-to-different-cathode-potentials
#2
Deyong Kong, Hui Yun, Dan Cui, Mengyuan Qi, Chunyan Shao, Dichen Cui, Nanqi Ren, Bin Liang, Aijie Wang
Bioelectrodegradation of various organic pollutants has been extensively studied. However, whether different cathode potentials could alter the antimicrobial-degrading biocathode community structure and composition remain poorly understood. Here, the microbial community structure and composition of the nitrofurans nitrofurazone (NFZ) degrading biocathode in response to different cathode potentials (-0.45±0.01, -0.65±0.01 and -0.86±0.05V vs standard hydrogen electrode, with applied cell voltages of 0.2, 0...
June 13, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28636759/rosacea-and-its-association-with-enteral-microbiota-in-korean-females
#3
Jae-Hui Nam, Yeojun Yun, Han-Saem Kim, Han-Na Kim, Ho Joo Jung, Yoosoo Chang, Seungho Ryu, Hocheol Shin, Hyung-Lae Kim, Won-Serk Kim
BACKGROUND: Rosacea is a chronic inflammatory dermatosis affecting the face and eyes. An association between systemic comorbidities and rosacea has been reported, but the link to enteral microbiota is uncertain. OBJECTIVES: We aimed to investigate the link between rosacea and enteral microbiota. METHODS: A cross-sectional study was performed in a sample of Korean women who participated in a health checkup program at the Kangbuk Samsung Hospital Health Screening Center between 23 June 2014 and 5 September 2014...
June 21, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28636666/molecular-and-microbiological-report-of-a-hospital-outbreak-of-ndm-1-carrying-enterobacteriaceae-in-mexico
#4
Paola Bocanegra-Ibarias, Elvira Garza-González, Rayo Morfín-Otero, Humberto Barrios, Licet Villarreal-Treviño, Eduardo Rodríguez-Noriega, Ulises Garza-Ramos, Santiago Petersen-Morfin, Jesus Silva-Sanchez
OBJECTIVES: To characterize the microbiological, molecular and epidemiological data of an outbreak of carbapenem-resistant Enterobacteriaceae (CRE) in a tertiary-care hospital in Mexico. METHODS: From September 2014 to July 2015, all CRE clinical isolates recovered during an outbreak in the Hospital Civil "Fray Antonio Alcalde" in Jalisco, Mexico were screened for antimicrobial susceptibility, carbapenemase production, carbapenemase-encoding genes, and plasmid profiles...
2017: PloS One
https://www.readbyqxmd.com/read/28636609/genomic-and-phenotypic-characterisation-of-fluoroquinolone-resistance-mechanisms-in-enterobacteriaceae-in-durban-south-africa
#5
John Osei Sekyere, Daniel Gyamfi Amoako
Resistance to fluoroquinolones (FQ) is being increasingly reported and found to be mediated by efflux pumps, plasmid-mediated quinolone resistance genes (PMQR) and mutations in gyrA, gyrB, parC and parE. However, studies reporting on FQ resistance mechanisms (FQRM), particularly in Africa, are focused mostly on Salmonella. This study used a whole-genome-based approach to describe FQRM in forty-eight clinical Enterobacteriaceae isolates comprising of Klebsiella pneumoniae (n = 21), Serratia marcescens (n = 12), Enterobacter spp...
2017: PloS One
https://www.readbyqxmd.com/read/28632934/a-prospective-microbiome-wide-association-study-of-food-sensitization-and-food-allergy-in-early-childhood
#6
Jessica H Savage, Kathleen A Lee-Sarwar, Joanne Sordillo, Supinda Bunyavanich, Yanjiao Zhou, George O'Connor, Megan Sandel, Leonard Bacharier, Robert Zeiger, Erica Sodergren, George M Weinstock, Diane R Gold, Scott T Weiss, Augusto A Litonjua
BACKGROUND: Alterations in the intestinal microbiome are prospectively associated with the development of asthma; less is known regarding the role of microbiome alterations in food allergy development. METHODS: Intestinal microbiome samples were collected at age 3-6 months in children participating in the follow-up phase of an interventional trial of high dose Vitamin D given during pregnancy. At age 3, sensitization to foods (milk, egg, peanut, soy, wheat, walnut) was assessed...
June 20, 2017: Allergy
https://www.readbyqxmd.com/read/28631657/citrobacter-freundii-as-a-cause-of-acute-suppurative-thyroiditis-in-an-immunocompetent-adult-female
#7
Gursimran Kaur Mohi, Priya Datta, Jagdish Chander, Arjun Das
Acute suppurative thyroiditis (AST) is an uncommon condition, in the patients with preexisting thyroid disease or immunosuppression. The most common cause of AST is bacterial, and the most common bacteria are Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli, and Klebsiella species. Due to various complications such as septicemia, septic thrombophlebitis, necrotizing mediastinitis, or pericarditis, prompt diagnosis and treatment are the keys to reduce mortality and morbidity. Here, we describe a case of a 40-year-old female with AST caused by Citrobacter freundii...
April 2017: Indian Journal of Pathology & Microbiology
https://www.readbyqxmd.com/read/28625613/comparison-of-electrochemical-performances-and-microbial-community-structures-of-two-photosynthetic-microbial-fuel-cells
#8
Wei Zheng, Teng Cai, Manhong Huang, Donghui Chen
Microbial fuel cells (MFCs) have attracted intensive interest for their power generation and pollutants removal characteristics. Electrochemical performances and community structures of two algae cathode photosynthetic MFCs were investigated and compared. Microbial consortia of these two MFCs were taken from wetland sediment (named SMFC) and an up-flow anaerobic wastewater treatment reactor (named UMFC). Maximum power density of the SMFC and UMFC achieved 202.9 ± 18.1 mW/m(2) and 158.2±15.1 mW/m(2), respectively...
June 15, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28624730/efficient-degradation-of-tetrabromobisphenol-a-by-synergistic-integration-of-fe-ni-bimetallic-catalysis-and-microbial-acclimation
#9
Xingxing Peng, Zhangna Wang, Jingfei Huang, Barry R Pittendrigh, Shengwei Liu, Xiaoshan Jia, Po Keung Wong
This study provides a novel technology for the degradation of tetrabromobisphenol A (TBBPA) via an interaction of Fe redox and a shift of functional microbial community. TBBPA was degraded by integration of synthesized Fe-Ni bimetallic particles and enriched microbial consortium within an aqueous system. This cooperative integration yielded the best TBBPA-degrading capacity (100% removal after treatment for 2 h) and highest TOC-removing efficiency (94.5% removal after treatment for 96 h), as well as the lowest toxicity to Vibrio fischeri (almost 0% growth inhibition during reaction)...
June 9, 2017: Water Research
https://www.readbyqxmd.com/read/28623574/the-bactericidal-effect-of-simultaneous-titanium-oxide-on-common-hospital-bacteria
#10
Ziaeddin Bonyadi, Maisam Mirzaee, Mohammad Mehdi Ejtehadi, Mehdi Mokhtari
Bacteria prevalence has increased in health centers and hospitals. Infection control can decrease the number of bacteria. Bacteria cause 90% of nosocomial infections and fungi, viruses, or protozoa are less involved. Bacteria control can decrease the number of diseases. The Simultaneous titanium oxide (SMTiO) is a new method of disinfection. This process degrades bacteria by producing hydroxyl radical. The present study was conducted with the aim of analyzing the bactericidal effect of simultaneous titanium oxide on common hospital bacteria...
July 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28622393/giardia-co-infection-promotes-the-secretion-of-antimicrobial-peptides-beta-defensin-2-and-trefoil-factor-3-and-attenuates-attaching-and-effacing-bacteria-induced-intestinal-disease
#11
Anna Manko, Jean-Paul Motta, James A Cotton, Troy Feener, Ayodele Oyeyemi, Bruce A Vallance, John L Wallace, Andre G Buret
Our understanding of polymicrobial gastrointestinal infections and their effects on host biology remains incompletely understood. Giardia duodenalis is an ubiquitous intestinal protozoan parasite infecting animals and humans. Concomitant infections with Giardia and other gastrointestinal pathogens commonly occur. In countries with poor sanitation, Giardia infection has been associated with decreased incidence of diarrheal disease and fever, and reduced serum inflammatory markers release, via mechanisms that remain obscure...
2017: PloS One
https://www.readbyqxmd.com/read/28621110/characterization-of-microbial-communities-in-chinese-rice-wine-collected-at-yichang-city-and-suzhou-city-in-china
#12
Yucai Lyu, Yanli Gong, Yajie Li, Zejiang Pan, Yi Yao, Ning Li, Jinling Guo, Dachun Gong, Yihong Ti, Caiyun Peng
Two typical microbial communities from Chinese rice wine fermentation collected in Yichang city and Suzhou city in China were investigated. Both communities could ferment glutinous rice to rice wine in 2 d. The sugar and ethanol contents were 198.67 and 14.47 mg/g, respectively, for rice wine from Yichang city, and 292.50 and 12.31 mg/g, respectively, for rice wine from Suzhou city. Acetic acid and lactic acid were the most abundant organic acids. Abundant fungi and bacteria were detected in both communities by high-throughput sequencing...
June 16, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28619154/an-unusual-culprit-klebsiella-pneumoniae-causing-septicaemia-outbreaks-in-neonatal-pigs
#13
Bethany G Bowring, V Anthony Fahy, Andrew Morris, Alison M Collins
This study investigated the cause of recent outbreaks of septicaemia in neonatal pigs in Australia (Victoria and Queensland). Septicaemia in neonatal pigs is commonly caused by enterotoxigenic E. coli, extraintestinal pathogenic E. coli and beta-haemolytic streptococci. Infrequent causes of septicaemia are Actinobacillus suis and Citrobacter freundii. Therefore, it was quite unexpected when Klebsiella pneumoniae was isolated in predominant growth from multiple organs of pigs dying of septicaemia from six days of age...
May 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28618266/il-22%C3%A2-upregulates-epithelial-claudin-2-to-drive-diarrhea-and-enteric-pathogen-clearance
#14
Pei-Yun Tsai, Bingkun Zhang, Wei-Qi He, Juan-Min Zha, Matthew A Odenwald, Gurminder Singh, Atsushi Tamura, Le Shen, Anne Sailer, Sunil Yeruva, Wei-Ting Kuo, Yang-Xin Fu, Sachiko Tsukita, Jerrold R Turner
Diarrhea is a host response to enteric pathogens, but its impact on pathogenesis remains poorly defined. By infecting mice with the attaching and effacing bacteria Citrobacter rodentium, we defined the mechanisms and contributions of diarrhea and intestinal barrier loss to host defense. Increased permeability occurred within 2 days of infection and coincided with IL-22-dependent upregulation of the epithelial tight junction protein claudin-2. Permeability increases were limited to small molecules, as expected for the paracellular water and Na(+) channel formed by claudin-2...
June 14, 2017: Cell Host & Microbe
https://www.readbyqxmd.com/read/28614737/glucose-triggers-the-cytotoxicity-of-citrobacter-sp-r1-against-microcystis-aeruginosa
#15
Pengfei Sun, Sofia Esquivel-Elizondo, Yuhua Zhao, Yonghong Wu
Algicidal bacteria offer a promising option for killing Microcystis aeruginosa, one notorious cyanobacteria causing harmful algal blooms. In this study, Citrobacter sp. R1 presented high algicidal activity (81.6±2.2%, 72h) against M. aeruginosa when cultured using glucose, while it showed no algicidal activity (0±3.4%) when cultured using wheat bran, suggesting that appropriate carbon source is crucial for algicidal bacteria in killing M. aeruginosa. The underlying algicidal mechanism of strain R1 was explored by studying the effect of different carbon sources (glucose and wheat bran) on its key algicidal gene expression and total protein translation...
June 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28612839/citrobacter-rodentium-a-model-enteropathogen-for-understanding-the-interplay-of-innate-and-adaptive-components-of-type-3-immunity
#16
REVIEW
D J Silberger, C L Zindl, C T Weaver
Citrobacter rodentium is a natural murine intestinal pathogen that shares a core set of virulence factors with the related human pathogens enteropathogenic Escherichia coli (EPEC) and enterohemorrhagic E. coli (EHEC). C. rodentium is now the most widely used small animal model for studying the molecular underpinnings of EPEC and EHEC infections in vivo, including: enterocyte attachment; virulence; colonization resistance; and mucosal immunity. In this review, we discuss type 3 immunity in the context of C. rodentium infection and discuss recent publications that use this model to understand how the innate and adaptive components of immunity intersect to mediate host protection against enteric pathogens and maintain homeostasis with the microbiota...
June 14, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28602917/crystal-structure-of-mutant-form-cys115his-of-citrobacter-freundii-methionine-%C3%AE-lyase-complexed-with-l-norleucine
#17
Svetlana V Revtovich, Elena A Morozova, Vitalia V Kulikova, Natalya V Anufrieva, Tatyana I Osipova, Vasiliy S Koval, Alexey D Nikulin, Tatyana V Demidkina
The mutant form of Citrobacter freundii methionine γ-lyase with the replacement of active site Cys115 for His has been found to be inactive in the γ-elimination reaction of methionine while fully active in the γ-elimination reaction of O-acetyl-l-homoserine and in the β-elimination reaction of S-alk(en)yl-substituted cysteines. In this work, the crystal structure of the mutant enzyme complexed with competitive inhibitor, l-norleucine was determined at 1.45Å resolution. At the enzyme active site the inhibitor proved to be bound both noncovalently and covalently, which corresponds to the two intermediates of the γ- and β-elimination reactions, Michaelis complex and the external aldimine...
June 6, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28602727/emergence-of-a-multidrug-resistant-citrobacter-freundii-of-sequence-type-8-harboring-an-unusual-vim-4-gene-cassette-in-poland
#18
Piotr Majewski, Piotr Wieczorek, Izabela Łapuć, Dominika Ojdana, Anna Sieńko, Paweł Sacha, Janusz Kłoczko, Elżbieta Tryniszewska
OBJECTIVES: The growing incidence of multidrug-resistant (MDR) bacteria is an emerging challenge in modern medicine. The utility of carbapenems, which are considered 'last-line' agents, is being diminished by the growing incidence of various resistance mechanisms in Gram-negative bacteria. A molecular investigation was performed of an MDR carbapenem-resistant Citrobacter freundii of sequence type 8 (ST8) isolated from a hematology patient with acute myeloid leukemia. METHODS: Multilocus sequence typing and analysis of the nucleotide sequence of the class I integron were performed using PCR and Sanger sequencing...
June 16, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28600633/igm-mediated-autoimmune-responses-to-oxidative-specific-epitopes-but-not-nitrosylated-adducts-are-significantly-decreased-in-pregnancy-association-with-bacterial-translocation-perinatal-and-lifetime-major-depression-and-the-tryptophan-catabolite-trycat-pathway
#19
Chutima Roomruangwong, Buranee Kanchanatawan, Sunee Sirivichayakul, George Anderson, André F Carvalho, Sebastien Duleu, Michel Geffard, Michael Maes
Immunoglubulin (Ig)M responses directed to oxidative specific epitopes (OSEs) and nitric oxide (NO)-adducts are significantly associated with major depression and physio-somatic symptoms. End of term serum IgM responses to OSEs and NO-adducts were assayed in pregnant women with (n = 24) and without prenatal depression (n = 25) as well as in 24 non-pregnant women. Associations of IgM/IgA responses to Gram-negative gut commensal bacteria (leaky gut index) and IgA/IgM responses to tryptophan catabolites (TRYCATs) were analyzed...
June 9, 2017: Metabolic Brain Disease
https://www.readbyqxmd.com/read/28592933/prevalence-of-biofilm-producing-aerobic-bacterial-isolates-in-burn-wound-infections-at-a-tertiary-care-hospital-in-northern-india
#20
S Asati, U Chaudhary
Burn wounds frequently get infected due to a break in skin integrity and prolonged hospitalization. Microbial flora originating from the patient's own flora colonize and infect the burn wounds. Bacterial biofilms in particular are postulated as the culprit for the development of non-healing burn wounds by inducing chronic inflammation in these patients. In the present study, 190 wound isolates obtained from patients admitted to the burn ward at the Pt. B.D. Sharma PGIMS, Rohtak, were evaluated for biofilm formation along with Antimicrobial Susceptibility Testing (AST)...
March 31, 2017: Annals of Burns and Fire Disasters
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