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https://www.readbyqxmd.com/read/28929047/determining-frequency-of-genes-of-ctx-m-and-ctx-m-15-of-producing-enterobacteriaceae-of-isolated-extended-spectrum-beta-lactamases-from-clinical-samples-of-patients-referred-to-training-hospitals-of-medical-sciences-university-khorramabad-iran
#1
Seyed Mojtaba Mosavian, Azam Rezvani-Rad
OBJECTIVE: The purpose of conducting this research was evaluation of the frequency of extended-spectrum beta-lactamases (ESBLs) in separated Enterobacteriaceae isolates from clinical samples in Khorramabad city and determination of their antimicrobial resistance pattern. MATERIALS AND METHODS: In this study, 240 isolates belonging to Enterobacteriaceae family were collected in time duration between March and June in 2014. The isolates were identified by standard biochemical tests...
April 2017: International Journal of Pharmaceutical Investigation
https://www.readbyqxmd.com/read/28887202/hospital-sewage-water-a-reservoir-for-variants-of-new-delhi-metallo-%C3%AE-lactamase-blandm-and-esbl-producing-enterobacteriaceae
#2
Shadab Parvez, Asad U Khan
New Delhi metallo-β-lactamase (NDM)-producing Enterobacteriaceae has become a threat to public health. Hospital sewage is generally unexplored, having a potential for harbouring bacteria causing healthcare-associated infections. Hence, we initiated this study to monitor NDM-producing Enterobacteriaceae in hospital sewage water. We detected 32 isolates with blaNDM variants, 17 Escherichia coli, 8 Citrobacter freundii, 4 Shigella boydii, 2 Citrobacter braakii, and 1 Citrobacter farmeri in hospital sewage water, showing resistance to all antibiotics except colistin...
September 5, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28886013/secondary-bacterial-infections-and-antibiotic-resistance-among-tungiasis-patients-in-western-kenya
#3
Ruth Monyenye Nyangacha, David Odongo, Florence Oyieke, Missiani Ochwoto, Richard Korir, Ronald Kiprotich Ngetich, Gladys Nginya, Olipher Makwaga, Christine Bii, Peter Mwitari, Festus Tolo
Tungiasis or jigger infestation is a parasitic disease caused by the female sand flea Tunga penetrans. Secondary infection of the lesions caused by this flea is common in endemic communities. This study sought to shed light on the bacterial pathogens causing secondary infections in tungiasis lesions and their susceptibility profiles to commonly prescribed antibiotics. Participants were recruited with the help of Community Health Workers. Swabs were taken from lesions which showed signs of secondary infection...
September 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28883810/from-farms-to-markets-gram-negative-bacteria-resistant-to-third-generation-cephalosporins-in-fruits-and-vegetables-in-a-region-of-north-africa
#4
Ferielle Mesbah Zekar, Sophie A Granier, Muriel Marault, Lydia Yaici, Benoit Gassilloud, Charles Manceau, Abdelaziz Touati, Yves Millemann
The role of food in human exposure to antimicrobial-resistant bacteria is a growing food safety issue. The contribution of fruits and vegetables eaten raw to this exposure is still unclear. The evaluation of contamination levels of fruits, vegetables and the agricultural environment by third-generation cephalosporin (3GC)-resistant Gram-negative bacteria was performed by analyzing 491 samples of fruits and vegetables collected from 5 markets and 7 farms in Bejaia area, north-eastern Mediterranean coast of Algeria...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28878510/antimicrobial-activity-of-essential-oil-and-aqueous-and-ethanol-extracts-of-teucrium-polium-l-subsp-gabesianum-l-h-from-tunisia
#5
Mahmoud Ben Othman, Karima Bel Hadj Salah-Fatnassi, Saida Ncibi, Amer Elaissi, Lazhar Zourgui
The antimicrobial effects of essential oil, ethanol and aqueous extracts of Teucrium polium L. were investigated against 13 microorganisms. Extracts and essential oil were obtained from maceration, decoction and hydrodistillation respectively. Samples were tested for their antimicrobial activity using the disk diffusion, the agar dilution and the agar incorporation method. Essential oil was analysed using GC/MS, results showed that β-pinene (35.97%) and α-pinene (13.32%) were the main components. Furthermore, essential oil exhibited the highest antimicrobial activity, it was most effective against Proteus mirabilis, Staphylococcus aureus and Citrobacter freundei where inhibition zone ranged between 15 and 25 mm, and with the microbial inhibitory concentration (MIC) values of 0...
July 2017: Physiology and Molecular Biology of Plants: An International Journal of Functional Plant Biology
https://www.readbyqxmd.com/read/28870092/emergence-of-arma-and-rmtb-genes-among-vim-ndm-and-imp-metallo-%C3%AE-lactamase-producing-multidrug-resistant-gram-negative-pathogens
#6
Sangeetha Gopalakrishnan, Arunagiri Kamalanathan, Sivaranjani Rajan, Vijay Manohar Bhagat, M K Showkath Ali
In the recent years, it has been noted that microorganisms with acquired resistance to almost all available potent antibiotics are increasing worldwide. Hence, the use of antibiotics in every clinical setup has to be organized to avoid irrational use of antibiotics. This study was aimed to establish the pattern of antibiotic sensitivity and relevance of antimicrobial resistance in aerobic Gram-negative bacilli. A total of 103 aerobic Gram-negative bacteria namely Escherichia coli, Klebsiella pneumoniae, Enterobacter spp...
September 5, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28865061/severe-enteropathy-and-hypogammaglobulinemia-complicating-refractory-mycobacterium-tuberculosis-complex-disseminated-disease-in-a-child-with-il-12r%C3%AE-1-deficiency
#7
Andrés Augusto Arias, Carlos M Perez-Velez, Julio César Orrego, Marcela Moncada-Velez, Jessica Lineth Rojas, Alejandra Wilches, Andrea Restrepo, Mónica Trujillo, Carlos Garcés, Catalina Arango-Ferreira, Natalia González, Carmen Oleaga-Quintas, Diana Fernández, Johana Marcela Isaza-Correa, Diego Eduardo Gongóra, Daniel Gonzalez-Loaiza, Juan Esteban Sierra, Jean Laurent Casanova, Jacinta Bustamante, José Luis Franco
PURPOSE: Mendelian susceptibility to mycobacterial disease is a rare clinical condition characterized by a predisposition to infectious diseases caused by poorly virulent mycobacteria. Other infections such as salmonellosis and candidiasis are also reported. The purpose of this article is to describe a young boy affected with various infectious diseases caused by Mycobacterium tuberculosis complex, Salmonella sp, Klebsiella pneumonie, Citrobacter sp., and Candida sp, complicated with severe enteropathy and transient hypogammaglobulinemia...
September 1, 2017: Journal of Clinical Immunology
https://www.readbyqxmd.com/read/28861525/impacts-of-penicillin-binding-protein-2-inactivation-on-%C3%AE-lactamase-expression-and-muropeptide-profile-in-stenotrophomonas-maltophilia
#8
Yi-Wei Huang, Yu Wang, Yun Lin, Chin Lin, Yi-Tsung Lin, Cheng-Chih Hsu, Tsuey-Ching Yang
Penicillin binding proteins (PBPs) are involved in peptidoglycan synthesis, and their inactivation is linked to β-lactamase expression in ampR-β-lactamase module-harboring Gram-negative bacteria. There are seven annotated PBP genes, namely, mrcA, mrcB, pbpC, mrdA, ftsI, dacB, and dacC, in the Stenotrophomonas maltophilia genome, and these genes encode PBP1a, PBP1b, PBP1c, PBP2, PBP3, PBP4, and PBP6, respectively. In addition, S. maltophilia harbors two β-lactamase genes, L1 and L2, whose expression is induced via β-lactam challenge...
July 2017: MSystems
https://www.readbyqxmd.com/read/28861518/butyrate-supplementation-at-high-concentrations-alters-enteric-bacterial-communities-and-reduces-intestinal-inflammation-in-mice-infected-with-citrobacter-rodentium
#9
Janelle A Jiminez, Trina C Uwiera, D Wade Abbott, Richard R E Uwiera, G Douglas Inglis
Butyrate is a short-chain fatty acid by-product of the microbial fermentation of dietary fermentable materials in the large intestine; it is the main energy source for enterocyte regeneration, modulates the enteric microbial community, and contributes to increasing host health via mechanisms that are relatively poorly defined. Limited research has examined the therapeutic potential of butyrate using models of enteric inflammation incited by pathogenic organisms. We used Citrobacter rodentium to incite acute Th1/Th17 inflammation to ascertain the impact of butyrate on the host-microbiota relationship...
July 2017: MSphere
https://www.readbyqxmd.com/read/28860194/the-bacterial-arginine-glycosyltransferase-effector-nleb-preferentially-modifies-fas-associated-death-domain-protein-fadd
#10
Nichollas E Scott, Cristina Giogha, Georgina L Pollock, Catherine L Kennedy, Andrew I Webb, Nicholas A Williamson, Jaclyn S Pearson, Elizabeth L Hartland
The inhibition of host innate immunity pathways is essential for the persistence of attaching and effacing (A/E) pathogens such as enteropathogenic Escherichia coli (EPEC) and Citrobacter rodentium during mammalian infections. To subvert these pathways and suppress the antimicrobial response, A/E pathogens use type III secretion systems (T3SS) to introduce effectors targeting key signaling pathways in host cells. One such effector is the arginine glycosyltransferase NleB1 (NleBCR in C. rodentium) that modifies conserved arginine residues in death domain-containing host proteins with N-acetylglucosamine (GlcNAc), thereby blocking extrinsic apoptosis signaling...
August 31, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28857032/citrobacter-portucalensis-sp-nov-isolated-from-an-aquatic-sample
#11
Teresa Gonçalves Ribeiro, Bruno Ribeiro Gonçalves, Mickael Santos da Silva, Ângela Novais, Elisabete Machado, João André Carriço, Luísa Peixe
A Gram-stain-negative strain, A60T, isolated from a water well sample in Portugal, was characterized phenotypically, genotypically and phylogenetically. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain A60T belonged to the genus Citrobacter, and recN gene phylogeny revealed one strongly supported clade encompassing strain A60T and 13 other strains from public databases, distinct from currently recognized species of the genus Citrobacter. Furthermore, multilocus sequence analysis (MLSA) based on concatenated partial fusA, leuS, pyrG and rpoB sequences confirmed the classification obtained with the recN sequence...
September 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28852861/analysis-of-endoscopic-brush-samples-identified-mucosa-associated-dysbiosis-in-inflammatory-bowel-disease
#12
Kyohei Nishino, Atsushi Nishida, Ryo Inoue, Yuki Kawada, Masashi Ohno, Shigeki Sakai, Osamu Inatomi, Shigeki Bamba, Mitsushige Sugimoto, Masahiro Kawahara, Yuji Naito, Akira Andoh
BACKGROUND: The mucosa-associated gut microbiota directly modulates epithelial and mucosal function. In this study, we investigated the mucosa-associated microbial community in patients with inflammatory bowel disease (IBD), using endoscopic brush samples. METHODS: A total of 174 mucus samples from 43 patients with ulcerative colitis (UC), 26 with Crohn's disease (CD) and 14 non-IBD controls were obtained by gentle brushing of mucosal surfaces using endoscopic cytology brushes...
August 29, 2017: Journal of Gastroenterology
https://www.readbyqxmd.com/read/28832493/modulation-of-gut-microbiota-of-overweight-mice-by-agavins-and-their-association-with-body-weight-loss
#13
Alicia Huazano-García, Hakdong Shin, Mercedes G López
Agavins consumption has led to accelerated body weight loss in mice. We investigated the changes on cecal microbiota and short-chain fatty acids (SCFA) associated with body weight loss in overweight mice. Firstly, mice were fed with standard (ST5) or high-fat (HF5) diet for five weeks. Secondly, overweight mice were shifted to standard diet alone (HF-ST10) or supplemented with agavins (HF-ST + A10) or oligofructose (HF-ST + O10), for five more weeks. Cecal contents were collected before and after supplementation to determine microbiota and SCFA concentrations...
August 23, 2017: Nutrients
https://www.readbyqxmd.com/read/28827120/a-simple-phenotypic-method-for-screening-of-mcr-1-mediated-colistin-resistance
#14
Marco Coppi, Antonio Cannatelli, Alberto Antonelli, Ilaria Baccani, Vincenzo Di Pilato, Samanta Sennati, Tommaso Giani, Gian Maria Rossolini
OBJECTIVES: To evaluate a novel method, named Colistin-MAC test, for phenotypic screening of acquired colistin-resistance mediated by transferable mcr-1 resistance determinants, based on colistin MIC reduction in the presence of dipicolinic acid (DPA). METHODS: The Colistin-MAC test consists in a broth microdilution method, in which colistin MIC is tested in absence or presence of DPA (900 μg/mL). Overall, 74 colistin-resistant strains of Enterobacteriaceae (65 Escherichia coli and 9 of other species), including 61 strains carrying mcr-1-like genes and 13 strains negative for mcr genes, were evaluated with the Colistin-MAC test...
August 18, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28826205/construction-of-recombinant-pdu-metabolosome-shells-for-small-molecule-production-in-corynebacterium-glutamicum
#15
Isabel Huber, David J Palmer, Kira N Ludwig, Ian R Brown, Martin J Warren, Julia Frunzke
Bacterial microcompartments have significant potential in the area of industrial biotechnology for the production of small molecules, especially involving metabolic pathways with toxic or volatile intermediates. Corynebacterium glutamicum is an established industrial workhorse for the production of amino acids and has been investigated for the production of diamines, dicarboxylic acids, polymers and biobased fuels. Herein, we describe components for the establishment of bacterial microcompartments as production chambers in C...
September 1, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28819794/in-vitro-selection-and-identification-of-potential-probiotics-isolated-from-the-gastrointestinal-tract-of-nile-tilapia-oreochromis-niloticus
#16
Rasha M Reda, Khaled M Selim, Hassanin M El-Sayed, M A El-Hady
Fish gut bacteria can be used as probiotics for aquaculture. The aim of this study is to screen and identify beneficial probiotic bacteria from the gut of Nile tilapia, Oreochromis niloticus. Nine out of one hundred thirty-five isolates were non-pathogenic through intraperitoneal injection and had antibacterial activities with at least a strain from the five isolated fish pathogens, Aeromonas sobria, Aeromonas hydrophila, Pseudomonas aeruginosa, Pseudomonas putida, and Staphylococcus aureus. Further tests showed that such isolates can survive in the presence of high bile concentration (10%) and at different acidic pH values...
August 17, 2017: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/28818914/complete-genome-sequence-of-citrobacter-freundii-705sk3-an-oxa-48-encoding-wastewater-isolate
#17
Katrin Zurfluh, Roger Stephan, Jochen Klumpp, Magdalena Nüesch-Inderbinen, Jörg Hummerjohann, Claudia Bagutti, Roger Marti
We present the genome sequence of Citrobacter freundii 705SK3, a wastewater isolate harboring an IncL OXA-48-encoding plasmid. Assembly of the genome resulted in a 5,242,839-bp circular chromosome (GC content, 52%) and two closed plasmids of 296,175 bp and 63, 458 bp in size.
August 17, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28818043/erratum-to-re-classification-within-the-serogroups-o3-and-o8-of-citrobacter-strains
#18
Ewa Katzenellenbogen, Magdalena Staniszewska, Nina A Kocharova, Małgorzata Mieszała, Agnieszka Korzeniowska-Kowal, Sabina Górska, Yuriy A Knirel, Andrzej Gamian
No abstract text is available yet for this article.
August 17, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28812548/bacteroidales-recruit-il-6-producing-intraepithelial-lymphocytes-in-the-colon-to-promote-barrier-integrity
#19
K A Kuhn, H M Schulz, E H Regner, E L Severs, J D Hendrickson, G Mehta, A K Whitney, D Ir, N Ohri, C E Robertson, D N Frank, E L Campbell, S P Colgan
Interactions between the microbiota and distal gut are important for the maintenance of a healthy intestinal barrier; dysbiosis of intestinal microbial communities has emerged as a likely contributor to diseases that arise at the level of the mucosa. Intraepithelial lymphocytes (IELs) are positioned within the epithelial barrier, and in the small intestine they function to maintain epithelial homeostasis. We hypothesized that colon IELs promote epithelial barrier function through the expression of cytokines in response to interactions with commensal bacteria...
August 16, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28806780/the-arac-negative-regulator-family-modulates-the-activity-of-histone-like-proteins-in-pathogenic-bacteria
#20
Araceli E Santiago, Michael B Yan, Tracy H Hazen, Brooke Sauder, Mario Meza-Segura, David A Rasko, Melissa M Kendall, Fernando Ruiz-Perez, James P Nataro
The AraC Negative Regulators (ANR) comprise a large family of virulence regulators distributed among diverse clinically important Gram-negative pathogens, including Vibrio spp., Salmonella spp., Shigella spp., Yersinia spp., Citrobacter spp., and pathogenic E. coli strains. We have previously reported broad effects of the ANR members on regulators of the AraC/XylS family. Here, we interrogate possible broader effects of the ANR members on the bacterial transcriptome. Our studies focused on Aar (AggR-activated regulator), an ANR family archetype in enteroaggregative E...
August 2017: PLoS Pathogens
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