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https://www.readbyqxmd.com/read/29161575/sulfadiazine-ciprofloxacin-promote-opportunistic-pathogens-occurrence-in-bulk-water-of-drinking-water-distribution-systems
#1
Haibo Wang, Yi Shen, Chun Hu, Xueci Xing, Dan Zhao
Effects of sulfadiazine and ciprofloxacin on the occurrence of free-living and particle-associated opportunistic pathogens in bulk water of simulated drinking water distribution systems (DWDSs) were investigated. It was found that sulfadiazine and ciprofloxacin greatly promoted the occurrence of opportunistic pathogens including Pseudomonas aeruginosa, Legionella pneumophila, Mycobacterium avium and its broader genus Mycobacterium spp., as well as the amoebae Acanthamoeba spp. and Hartmanella vermiformis, in bulk water of DWDSs...
November 18, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29161086/potential-role-of-the-lung-microbiome-in-shaping-asthma-phenotypes
#2
Kian Fan Chung
The introduction of 16s ribosomal RNA sequencing as a nonculture technique has led to the discovery of the presence of microbiota in the lower airways of healthy individuals. These bacterial communities may originate from the mouth and nasopharynx or from the environment by inhalation. The microbial composition of the lower airways may be modulated by dietary factors, antibiotic therapy, and microbial infections, particularly in early life. In addition, circulatory products from gut microbiota may influence the lung microbiota to maintain mucosal immunity...
November 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/29160808/interplay-between-colistin-resistance-virulence-and-fitness-in-acinetobacter-baumannii
#3
REVIEW
Gabriela Jorge Da Silva, Sara Domingues
Acinetobacter baumannii is an important opportunistic nosocomial pathogen often resistant to multiple antibiotics classes. Colistin, an "old" antibiotic, is now considered a last-line treatment option for extremely resistant isolates. In the meantime, resistance to colistin has been reported in clinical A. baumannii strains. Colistin is a cationic peptide that disrupts the outer membrane (OM) of Gram-negative bacteria. Colistin resistance is primarily due to post-translational modification or loss of the lipopolysaccharide (LPS) molecules inserted into the outer leaflet of the OM...
November 21, 2017: Antibiotics
https://www.readbyqxmd.com/read/29160642/neonatal-bacterial-meningitis-a-systematic-review-of-european-available-data
#4
Antonio DI Mauro, Francesca Cortese, Nicola Laforgia, Beatrice Pantaleo, Rachele Giuliani, Donato Bonifazi, Marco M Ciccone, Paola Giordano
BACKGROUND: Despite advances in neonatal intensive care and the improvements in surveillance, prevention and vaccination programs, neonatal meningitis still represents an important cause of morbidity and mortality in infants, with the highest mortality in the newborn population. AIM: To summarize current knowledge about this topic with particular attention to management of neonatal meningitis in order to provide a useful tool for clinicians. METHODS: We reviewed the existent literature from five European Countries (France, German, Italy, Spain and United Kingdom) on the effectiveness of treatments for bacterial meningitis in newborns taking into consideration the antibiotic resistance phenomenon...
November 21, 2017: Minerva Pediatrica
https://www.readbyqxmd.com/read/29160518/evaluation-of-carbapenem-resistant-enterobacteriaceae-in-a-tertiary-level-reference-hospital-in-rio-grande-do-sul-brazil
#5
Vinícius Victor Lorenzoni, Danielly da Costa Silva, Roberta Filipini Rampelotto, Patrícia Chaves Brites, Bárbara Villa, Rosmari Hörner
INTRODUCTION: The rapid global spread of carbapenem-resistant Enterobacteriaceae (CRE) is a threat to the health system. METHODS: We evaluated the antimicrobial susceptibility profiles of 70 CRE isolated in a tertiary hospital in Brazil between August and December 2015, and determined their resistance mechanisms. RESULTS: The most prevalent microorganism was Klebsiella pneumoniae (95.7%); it showed high-level resistance to carbapenems (>98%), with sensitivity to colistin (91...
September 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/29160117/determination-and-identification-of-antibiotic-resistant-oral-streptococci-isolated-from-active-dental-infections-in-adults
#6
Juan Pablo Loyola-Rodriguez, Maria Elena Ponce-Diaz, Alejandra Loyola-Leyva, Jose O Garcia-Cortes, Carlo E Medina-Solis, Azael A Contreras-Ramire, Eduardo Serena-Gomez
OBJECTIVE: To determine and identify antibiotic-resistant bacteria (ARB) of oral streptococci from active dental infections in adults and its association with age and gender. MATERIAL AND METHODS: This cross-sectional study included 59 subjects from 18 to 62 years old. Ninety-eighth samples obtained from the subjects were cultivated in agar plates containing antibiotics amoxicillin/clavulanic acid (A-CA), clindamycin, and moxifloxacin (concentrations of 16, 32 or 64 µg/ml)...
November 21, 2017: Acta Odontologica Scandinavica
https://www.readbyqxmd.com/read/29159979/ultrasound-microbubbles-enhance-the-activity-of-vancomycin-against-staphylococcus-epidermidis-biofilms-in-vivo
#7
Ying Dong, Junshuai Li, Pan Li, Jialin Yu
OBJECTIVES: Staphylococcus epidermidis is the predominant pathogen of device-associated infections. By forming biofilms on the device surface, S epidermidis has substantial resistance to antibiotics and is difficult to eradicate. This study aimed to explore the synergistic effect of ultrasound (US)-mediated microbubbles combined with vancomycin on S epidermidis biofilms in a rabbit model. METHODS: Two polytetrafluoroethene catheters with preformed S epidermidis biofilms were implanted subcutaneously in a rabbit, one on either side of the spine...
November 21, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29158629/overexpression-of-lhsornpr1-a-npr1-like-gene-from-the-oriental-hybrid-lily-sorbonne-conferred-enhanced-resistance-to-pseudomonas-syringae-pv-tomato-dc3000-in-arabidopsis
#8
Le Wang, Zhihong Guo, Yubao Zhang, Yajun Wang, Guo Yang, Liu Yang, Li Wang, Ruoyu Wang, Zhongkui Xie
The non-expressor of the pathogenesis-related genes 1 (NPR1) is a master regulator in defense signaling of plants and plays a key role in basal and systemic acquired resistance. In this study, we isolated a NPR1-like gene from the oriental hybrid lily 'Sorbonne' (designated as LhSorNPR1) using rapid amplification of cDNA ends (RACE). The open reading frame of LhSorNPR1 consisted of 1854 bp, encoding a protein of 617 amino acids. Multiple sequence alignment revealed that LhSorNPR1 shares high similarity to NPR1-like proteins and characteristics of the BTB/POZ domain and ankyrin repeats...
October 2017: Physiology and Molecular Biology of Plants: An International Journal of Functional Plant Biology
https://www.readbyqxmd.com/read/29158434/high-levels-of-cyclic-di-gmp-in-klebsiella-pneumoniae-attenuate-virulence-in-the-lung
#9
David A Rosen, Joy Twentyman, David A Hunstad
The bacterial second messenger, bis-(3' -5')-cyclic dimeric guanosine monophosphate (c-di-GMP) has been shown to influence expression of virulence factors in certain pathogenic bacteria, but little is known about its activity in the increasingly antibiotic-resistant pathogen Klebsiella pneumoniae Here, expression in K. pneumoniae of a heterologous diguanylate cyclase increased bacterial c-di-GMP concentration and attenuated pathogenesis in murine pneumonia. This attenuation remained evident in mice lacking the c-di-GMP sensor STING, indicating that high c-di-GMP exerted its influence not on host responses, but on bacterial physiology...
November 20, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/29158430/characterization-of-stress-and-innate-immunity-resistance-of-wild-type-and-%C3%AE-p66-borrelia-burgdorferi
#10
Michael W Curtis, Beth L Hahn, Kai Zhang, Chunhao Li, Richard T Robinson, Jenifer Coburn
Borrelia burgdorferi is a causative agent of Lyme disease, the most common arthropod-borne disease in the United States. B. burgdorferi evades host immune defenses to establish a persistent, disseminated infection. Previous work showed that P66-deficient B. burgdorferi (Δp66) is cleared quickly after inoculation in mice. We demonstrate that Δp66 is rapidly cleared from the skin inoculation site prior to dissemination. The rapid clearance of Δp66 is not due to inherent defects in multiple properties that might affect infectivity: bacterial outer membrane integrity, motility, chemotactic response, or nutrient acquisition...
November 20, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/29158429/b-cell-presentation-of-chlamydia-antigen-selects-out-protective-cd4%C3%AE-13-t-cells-implications-for-genital-tract-tissue-resident-memory-lymphocyte-clusters
#11
Raymond M Johnson, Hong Yu, Norma Olivares Strank, Karuna Karunakaran, Ying Zhu, Robert C Brunham
Surveillance and defense of the enormous mucosal interface with the nonsterile world is critical to protecting the host from a wide range of pathogens. Chlamydia trachomatis (Ct) is an intracellular bacterial pathogen that replicates almost exclusively in the epithelium of the reproductive tract. The fallopian tubes and vagina are poorly suited to surveillance and defense with limited immune infrastructure positioned near the epithelium. However, a dynamic process during clearing primary infections leaves behind new lymphoid clusters immediately beneath the epithelium...
November 20, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/29158281/pharmacokinetics-and-safety-of-omadacycline-in-subjects-with-impaired-renal-function
#12
Jolene K Berg, Evan Tzanis, Lynne Garrity-Ryan, Stephen Bai, Surya Chitra, Amy Manley, Stephen Villano
Many antibiotics require dosing adjustments in patients with renal impairment and/or in those undergoing hemodialysis. Omadacycline, the first aminomethylcycline antibiotic in late-stage clinical development, displays activity against a broad-spectrum of bacterial pathogens, including resistant strains. Data from completed phase 3 acute bacterial skin and skin structure infections (ABSSSI) and community-acquired bacterial pneumonia (CABP) studies showed intravenous (IV) to once-daily oral omadacycline to be clinically effective and well tolerated...
November 20, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29158280/anti-pseudomonal-activity-of-phage-pev20-in-a-dry-powder-formulation-a-proof-of-principle-study-in-a-murine-lung-infection-model
#13
Rachel Yoon Kyung Chang, Ke Chen, Jiping Wang, Martin Wallin, Warwick Britton, Sandra Morales, Elizabeth Kutter, Jian Li, Hak-Kim Chan
Bacteriophage therapy is a promising alternative treatment to antibiotics as it has been documented to be efficacious against multi-drug resistant bacteria with minimal side effects. Several groups have demonstrated the efficacy of phage suspension in vivo to treat lung infections using intranasal delivery; however, phage dry powder administration to the lungs has not yet been explored. Powder formulations provide potential advantages over liquid formulation, including easy storage, transport and administration...
November 20, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29158275/a-simplified-derivative-of-human-defensin-5-with-potent-efficiency-against-multidrug-resistant-acinetobacter-baumannii
#14
Cheng Wang, Gaomei Zhao, Song Wang, Yin Chen, Yali Gong, Shilei Chen, Yang Xu, Mengjia Hu, Xinmiao Wang, Hao Zeng, Aiping Wang, Dengqun Liu, Yongping Su, Tianmin Cheng, Fang Chen, Junping Wang
The increasing incidence of multidrug-resistant Acinetobacter baumannii (MDRAb) infections worldwide has necessitated the development of novel antibiotics. Human defensin 5 (HD5) is an endogenous peptide with a complex architecture and antibacterial activity against MDRAb In the present study, we attempted to simplify the structure of HD5 by removing disulfide bonds. We found that the Cys2-4 bond was most indispensable for HD5 to inactivate MDRAb, although the antibacterial activity of the derivative was significantly attenuated...
November 20, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29158242/mutations-in-sugar-nucleotide-synthesis-genes-restore-holdfast-polysaccharide-anchoring-to-caulobacter-crescentus-holdfast-anchor-mutants
#15
Gail G Hardy, Evelyn Toh, Cécile Berne, Yves V Brun
Attachment is essential for microorganisms to establish interactions with both biotic and abiotic surfaces. Stable attachment of Caulobacter crescentus to surfaces requires an adhesive polysaccharide holdfast, but the exact composition of holdfast is unknown. The holdfast is anchored to the cell envelope by outer membrane proteins HfaA, HfaB and HfaD. Holdfast anchor gene mutations result in holdfast shedding and reduced cell adherence. Translocation of HfaA and HfaD to the cell surface requires HfaB. The Wzx homolog, HfsF, is predicted to be a bacterial polysaccharide flippase...
November 20, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/29157954/activity-of-omadacycline-tested-against-streptococcus-pneumoniae-from-a-global-surveillance-program-2014
#16
M A Pfaller, P R Rhomberg, M D Huband, R K Flamm
The activity of omadacycline and comparators when tested against a subset of Streptococcus pneumoniae from US and European regions of a 2014 global surveillance program (304 isolates) are reported. These MIC results were compared to those obtained when testing S. pneumoniae from 2010 surveillance (1,834 isolates). The omadacycline MIC50/90 for S. pneumoniae (2014) was 0.06/0.06μg/mL, similar to 2010 (MIC50/90, 0.06/0.12μg/mL). The omadacycline MIC90 (0.06-0.12μg/mL) was similar for the penicillin-susceptible, -intermediate, -resistant, multidrug-resistance (MDR; ≥3 classes), and ceftriaxone nonsusceptible subgroups...
October 19, 2017: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/29157827/supplementation-with-tocotrienols-from-bixa-orellana-improves-the-in-vivo-efficacy-of-daptomycin-against-methicillin-resistant-staphylococcus-aureus-in-a-mouse-model-of-infected-wound
#17
Elisa Pierpaoli, Fiorenza Orlando, Oscar Cirioni, Oriana Simonetti, Andrea Giacometti, Mauro Provinciali
BACKGROUND: Methicillin-resistant Staphylococcus aureus (MRSA) is a common cause of skin and soft-tissue infection worldwide. An adequate immune response acts as a first line of defence against infections and therefore plays an essential role in the maintenance of health. Tocotrienols (T3s), the lesser known isomers of vitamin E, possess many biological properties and have been recognized as immunomodulators. PURPOSE: The aim of this study was to investigate whether the in vivo supplementation with a mixture of 87...
December 1, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/29157535/crispr-based-antibacterials-transforming-bacterial-defense-into-offense
#18
Adrienne C Greene
The development of antimicrobial-resistant (AMR) bacteria poses a serious worldwide health concern. CRISPR-based antibacterials are a novel and adaptable method for building an arsenal of antibacterials potentially capable of targeting any pathogenic bacteria.
November 17, 2017: Trends in Biotechnology
https://www.readbyqxmd.com/read/29157372/prevalence-of-antimicrobial-resistance-from-bacterial-culture-and-susceptibility-records-from-horse-samples-in-south-africa
#19
John K Chipangura, Thireshni Chetty, Marcia Kgoete, Vinny Naidoo
The continuous increase in prevalence of antimicrobial resistant bacteria presents a significant public health problem and is an indicator that antimicrobial prudent usage guidelines are not being followed, especially in developing countries. Despite trends being available from numerous countries, there is little published for South Africa. This study was aimed at estimating the prevalence and trends of antimicrobial resistance from bacterial isolates from equine clinical samples submitted for culture and susceptibility testing to the veterinary bacteriology laboratory of the University of Pretoria...
December 1, 2017: Preventive Veterinary Medicine
https://www.readbyqxmd.com/read/29156371/bacterial-microbiota-of-the-nasal-passages-across-the-span-of-human-life
#20
REVIEW
Lindsey Bomar, Silvio D Brugger, Katherine P Lemon
The human nasal passages host major human pathogens. Recent research suggests that the microbial communities inhabiting the epithelial surfaces of the nasal passages are a key factor in maintaining a healthy microenvironment by affecting both resistance to pathogens and immunological responses. The nasal bacterial microbiota shows distinct changes over the span of human life and disruption by environmental factors might be associated with both short- and long-term health consequences, such as susceptibility to viral and bacterial infections and disturbances of the immunological balance...
November 17, 2017: Current Opinion in Microbiology
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