keyword
MENU ▼
Read by QxMD icon Read
search

klebsiella pneumonia

keyword
https://www.readbyqxmd.com/read/28741998/retention-of-virulence-following-colistin-adaptation-in-klebsiella-pneumoniae-is-strain-dependent-rather-than-associated-with-specific-mutations
#1
Matthew E Wand, Lucy J Bock, J Mark Sutton
This study aimed to understand the impact on virulence and fitness of mutations in specific genes found after adaptation of Klebsiella pneumoniae to colistin. Isolates with an increase in their inhibitory concentration (MIC) to colistin of 32- to >128-fold were shown to have mutations in mgrB, phoPQ and pmrAB, all known regulators of pathways affecting membrane lipid content. When these strains were used in studies in Galleria mellonella there was no clear correlation between mutations in specific genes per se and loss of virulence...
July 21, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28739787/resistance-to-ceftazidime-avibactam-is-due-to-transposition-of-kpc-in-a-porin-deficient-strain-of-klebsiella-pneumoniae-with-increased-efflux-activity
#2
Kirk Nelson, Peera Hemarajata, Dongxu Sun, Debora Rubio-Aparicio, Ruslan Tsivkovski, Shangxin Yang, Robert Sebra, Andrew Kasarskis, Hoan Nguyen, Blake M Hanson, Shana Leopold, George Weinstock, Olga Lomovskaya, Romney M Humphries
Ceftazidime-avibactam is an antibiotic with activity against serine beta-lactamases, including KPC. Recently, reports have emerged of KPC-producing isolates resistant to this antibiotic, including a report of a wild-type KPC-3 producing sequence type 258 Klebsiella pneumoniae that was resistant to ceftazidime-avibactam. We describe a detailed analysis of this isolate, in the context of two other closely related KPC-3 producing isolates, recovered from the same patient. Both isolates encoded a non-functional OmpK35, whereas we demonstrate a novel T333N mutation in OmpK36, present in the ceftazidime-avibactam resistant isolate, reduced activity of this porin and impacted ceftazidime-avibactam susceptibility...
July 24, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28739224/esbl-producing-escherichia-coli-and-klebsiella-pneumoniae-the-most-prevalent-clinical-isolates-obtained-between-2005-and-2012-in-mexico
#3
Humberto Barrios, Ulises Garza-Ramos, Ilse Mejia-Miranda, Fernando Reyna-Flores, Alejandro Sánchez-Perez, Dalila Mosqueda-García, Jesus Silva-Sanchez
OBJECTIVES: To identify the prevalence of ESBL genes in the principal group of Enterobacteriaceae causing nosocomial infections and to identify the phylogenetic group in E. coli isolates. METHODS: There were collected 1084 ESBL-producing Enterobacteriaceae isolates during 2005 to 2012 from adult patients from 14 hospitals and corresponding to eight states and five regions (SE, S, N, W and NW) in Mexico. The CTX-M-(CTX-M-1 group), SHV-, TLA- and GES-type ESBLs genes were screened...
July 21, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28738715/antimicrobial-modulatory-and-chemical-analysis-of-the-oil-of-croton-limae
#4
Tiago Rodrigues Leite, Maria Arlene Pessoa da Silva, Antônio Carlito Bezerra Dos Santos, Henrique Douglas Melo Coutinho, Antonia Eliene Duarte, José Galberto Martins da Costa
CONTEXT: Croton sp. are plants with a well-reported antimicrobial activity. Croton limae A.P. Gomes, M.F. Sales P.E. Berry (Euphorbiaceae), known as 'marmeleiro-prateado', is commonly used to manage abdominal pain in Brazil. OBJECTIVE: This work evaluates the phytochemical composition, antimicrobial and modulatory activities of the essential oil of C. limae leaves (EOCL). MATERIALS AND METHODS: The minimum inhibitory concentration (MIC) and the modulation of the antibiotic activity were determined using a microdilution method...
December 2017: Pharmaceutical Biology
https://www.readbyqxmd.com/read/28738348/colistin-resistance-in-kpc-2-and-shv-5-producing-klebsiella-pneumoniae-clinical-isolates-in-bulgaria
#5
Encho Savov, Iva Todorova, Lida Politi, Angelina Trifonova, Maja Borisova, Elena Kioseva, Athanassios Tsakris
BACKGROUND/AIMS: Colistin resistance is increasingly recognized among carbapenemase-producing Klebsiella pneumoniae isolates in several European regions. The current study documents the appearance of colistin resistance among KPC-2 and SHV-5-produning K. pneumoniae strains in Bulgaria. METHODS: Four colistin-resistant K. pneumoniae isolates were recovered from 2 patients hospitalized in the anesthesiology and resuscitation clinic of a tertiary care university hospital in Sofia, Bulgaria...
July 22, 2017: Chemotherapy
https://www.readbyqxmd.com/read/28737463/prevalence-of-a-new-variant-oxa-204-and-oxa-48-carbapenemases-plasmids-encoded-in-klebsiella-pneumoniae-clinical-isolates-in-tunisia
#6
Rym Ouertani, Mariem Ben Jomàa-Jemili, Haythem Gharsa, Anne Limelette, Thomas Guillard, Lucien Brasme, Christophe de Champs, Chedly Chouchani
Carbapenemase-producing Klebsiella pneumoniae strains have emerged as a major problem for healthcare systems. The aim of this study was to determine the role and diversity of plasmids harboring carbapenemases encoding genes from a collection of K. pneumoniae isolates recovered between July 2011 and January 2012, with decreased susceptibility to carbapenems. Imipenem (IPM), ertapenem (ETP), meropenem (MEM), and doripenem (DOR) minimum inhibitory concentrations (MICs) were determined by E-test. Carbapenemase production was detected with the modified Hodge test...
July 24, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28736222/hypermucoviscosity-rmpa-and-aerobactin-are-associated-with-community-acquired-klebsiella-pneumoniae-bacteremic-isolates-causing-liver-abscess-in-singapore
#7
Thean Yen Tan, Melissa Ong, Yvonne Cheng, Lily Siew Yong Ng
INTRODUCTION: This retrospective study investigated the clinical etiology of community-acquired bacteremic Klebsiellapneumoniae infections, and characterized laboratory and genetic markers which may be associated with primary liver abscess (PLA). METHODS: Community-onset K. pneumoniae bacteremic episodes from 2010 to 2011 were identified from the laboratory information system. Isolates were retrieved for susceptibility testing, hypermucoviscosity testing, PCR-based serotyping (K1, K2 and K5) and PCR detection of virulence genes (rmpA, alls, kfu and aerobactin)...
July 14, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28735356/evaluation-of-anthelmintic-antimicrobial-and-antioxidant-activity-of-chenopodium-album
#8
Bashir A Lone, M Z Chishti, Fayaz Ahmad Bhat, Hidayatullah Tak, Suhaib A Bandh, Abida Khan
The objective of this study was to evaluate the anthelmintic, antimicrobial and antioxidant activities of Chenopodium album against gastrointestinal nematodes of sheep and some pathogenic microbes. A worm motility inhibition assay was used for in vitro study, and a faecal egg count reduction assay was used for an in vivo study. Various concentrations ranging from 100 to 500 μg/ml of the extract were subjected to antimicrobial screening by disc diffusion method against four selected bacterial (Staphylococcus aureus, Klebsiella pneumoniae, Pseudomonas multocida and Escherichia coli) and two fungal (Aspergillus flavus and Candida albicans) strains in order to estimate the medicinal potential of the herb...
July 22, 2017: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/28735318/trends-of-bloodstream-infections-in-a-university-greek-hospital-during-a-three-year-period-incidence-of-multidrug-resistant-bacteria-and-seasonality-in-gram-negative-predominance
#9
Fevronia Kolonitsiou, Matthaios Papadimitriou-Olivgeris, Anastasia Spiliopoulou, Vasiliki Stamouli, Vasileios Papakostas, Eleni Apostolopoulou, Christos Panagiotopoulos, Markos Marangos, Evangelos D Anastassiou, Myrto Christofidou, Iris Spiliopoulou
The aim of the study was to assess the epidemiology, the incidence of multidrug-resistant bacteria and bloodstream infections' (BSIs) seasonality in a university hospital. This retrospective study was carried out in the University General Hospital of Patras, Greece, during 2011-13 y. Blood cultures from patients with clinical presentation suggestive of bloodstream infection were performed by the BacT/ALERT System. Isolates were identified by Vitek 2 Advanced Expert System. Antibiotic susceptibility testing was performed by the disk diffusion method and E-test...
July 6, 2017: Polish Journal of Microbiology
https://www.readbyqxmd.com/read/28735313/early-kpc-producing-klebsiella-pneumoniae-bacteremia-among-intensive-care-unit-patients-non-colonized-upon-admission
#10
Matthaios Papadimitriou-Olivgeris, Fotini Fligou, Iris Spiliopoulou, Christina Bartzavali, Vasiliki Dodou, Sophia Vamvakopoulou, Kyriaki Koutsileou, Anastasia Zotou, Evangelos D Anastassiou, Myrto Christofidou, Markos Marangos
Among 140 patients colonized by KPC-producing Klebsiella pneumoniae (KPC-Kp) between fourth and seventh day of Intensive Care Unit stay, 24 developed bacteraemia immediately after colonization. Colistin-resistance of the colonizing isolate was the factor significantly associated with early KPC-Kp bacteraemia (P < 0.001; OR 6.6, 95% CI 2.4-18.4), a worrisome finding since infections by colistin-resistant isolates is associated with increased mortality due to limited remaining therapeutic options.
July 6, 2017: Polish Journal of Microbiology
https://www.readbyqxmd.com/read/28735050/antimicrobial-resistance-profiles-and-genotypes-of-extended-spectrum-%C3%AE-lactamase-and-ampc-%C3%AE-lactamase-producing-klebsiella-pneumoniae-isolated-from-dogs-in-beijing-china
#11
Yanhan Liu, Yonghui Yang, Yanyun Chen, Zhaofei Xia
OBJECTIVES: Klebsiella pneumoniae, which exists in the intestinal and respiratory tracts of humans and animals, is an important conditional pathogen in many animals. The aim of the current study was to investigate the antimicrobial resistance profiles and genotypes of extended-spectrum β-lactamase (ESBL) - and AmpC β-lactamase-producing K. pneumoniae isolated from dogs. METHODS: A total of 285 isolates, collected from fecal and urine samples of diseased dogs in a Veterinary Teaching Hospital in Beijing, were characterized by antimicrobial susceptibility testing and screened for ESBL and AmpC β-lactamase phenotypes...
July 19, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28733150/seven-new-lignan-glycosides-from-the-branches-of-alangium-kurzii-craib-var-laxifolium
#12
Jie Ren, Yang-Guo Xie, Ying-Ying Huang, Sheng-Lan Zhu, Shi-Kai Yan, Hui-Zi Jin, Wei-Dong Zhang
Seven new lignan glycosides (1-3, 8-10, and 14) and 17 known compounds were isolated from the branches of Alangium kurzii Craib var. laxifolium. Their structures were established by spectroscopic analysis and circular dichroism (CD) and X-ray analysis. The isolated compounds were evaluated for their antibacterial activities against Staphylococcus aureus CI1011, Streptococcus suis CI1608, Salmonella gallinarum CI0912, Enterococcus faecalis CI1304, Aeromonas hydrophila CI1008, Escherichia coli CI151012, Vibrio parahaemolyticus CI150506, Klebsiella pneumoniae CI131216, Pseudomonas aeruginosa CI1011, Staphylococcus epidermidis CI1110, and Streptococcus agalactiae CI1302...
July 19, 2017: Fitoterapia
https://www.readbyqxmd.com/read/28732788/occurrence-and-clonal-diversity-of-multidrug-resistant-klebsiella-pneumoniae-recovered-from-inanimate-surfaces-in-algerian-hospital-environment-first-report-of-arma-qnrb-and-aac-6-ib-cr-genes
#13
Karima Zenati, Farida Sahli, Vincent Garcia, Sofiane Bakour, Djellali Belhadi, Jean Marc Rolain, Abdelaziz Touati
PURPOSE: The aim of this study is to characterize the molecular support of antibiotic resistance in MDR K. pneumonaie recovered from inanimate surfaces between March 2012 to February 2014 in three teaching hospitals (Setif, Bejaia and Constantine) in Algeria. RESULTS: Forty four K. pneumoniae producing ESBL were detected and blaCTX-M-15 and blaCTX-M-3 were detected respectively in 41 and 3 isolates. These K. pneumoniae isolates producing ESBL were also resistant to gentamicin (87%), tobramicin (87%), ciprofloxacin (66%) and ofloxacin (62%)...
July 18, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28732013/the-kp1_4563-gene-is-regulated-by-the-camp-receptor-protein-and-controls-type-3-fimbrial-function-in-klebsiella-pneumoniae-ntuh-k2044
#14
Mei Luo, Shiya Yang, Xuan Li, Pin Liu, Jian Xue, Xipeng Zhou, Kewen Su, Xuan Xu, Ying Qing, Jingfu Qiu, Yingli Li
Klebsiella pneumoniae (K. pneumoniae) is an opportunistic pathogen that can adhere to host cells or extracellular matrix via type 1 and type 3 fimbriae. KP1_4563 is a gene encoding a hypothetical protein in K. pneumoniae NTUH-K2044. KP1_4563 is located between the type 1 and type 3 fimbrial gene clusters and is likely associated with fimbrial function given its putative conserved domains of unknown function (DUF1471). Cyclic AMP receptor protein (CRP) regulates virulence-related gene expression and is a crucial transcriptional regulator in many bacteria...
2017: PloS One
https://www.readbyqxmd.com/read/28731269/biofilm-formation-and-antibiotic-resistance-in-klebsiella-pneumoniae-urinary-strains
#15
Claudia Vuotto, Francesca Longo, Chiara Pascolini, Gianfranco Donelli, Maria Pia Balice, Maria Francesca Libori, Valentina Tiracchia, Antonino Salvia, Pietro Emanuele Varaldo
AIMS: Multi-drug resistant Klebsiella pneumoniae has become a relevant healthcare-associated pathogen. Capsule, type 1 and 3 fimbriae (mrkA gene), type 2 quorum-sensing system (luxS), synthesis of D-galactan I (wbbM), LPS transport (wzm) and poly-beta-1,6-N-acetyl-D-glucosamine (pgaA) seem involved in K. pneumoniae biofilm. Non-enzymatic antibiotic resistance is related to non-expression or mutation of porins (OmpK35 and OmpK36), and efflux pump (acrB) over-expression. The aim of this study was to analyse some virulence factors of K...
July 21, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28730700/relating-switching-rates-between-normal-and-persister-cells-to-substrate-and-antibiotic-concentrations-a-mathematical-modelling-approach-supported-by-experiments
#16
Gabriel Carvalho, Cyril Guilhen, Damien Balestrino, Christiane Forestier, Jean-Denis Mathias
We developed and compared two mathematical models of variable phenotypic switching rates between normal and persister cells that depend on substrate concentration and antibiotic presence. They could be used to simulate the formation of persisters in environments with concentration gradients such as biofilms. Our models are extensions of a previous model of the dynamics of normal and persistent cell populations developed by Balaban et al. (2004, Science 305: 1622). We calibrated the models' parameters with experimental killing curves obtained after ciprofloxacin treatment of samples regularly harvested from planktonic batch cultures of Klebsiella pneumoniae...
July 21, 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/28729208/detection-of-multidrug-resistant-mdr-bacteria-in-untreated-waste-water-disposals-of-hospitals-in-dhaka-city-bangladesh
#17
M A G Rabbani, Md Zakir Hossain Hawlader, Yearul Kabir
BACKGROUND: Emergence of MDR bacteria is a global problem and a major burden for treatment of various infectious diseases. This study was performed to detect antibiotic resistant bacteria in untreated hospital waste. METHOD: Waste water samples were collected from sewerage disposal points of two renowned hospital of Dhaka city and a total of 59 Escherichia coli and 29 Klebsiella pneumonia isolates were isolated. Antibiotic susceptibility were measured by disc diffusion method...
July 17, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28729207/first-two-cases-of-severe-multifocal-infections-caused-by-klebsiella-pneumoniae-in-switzerland-characterization-of-an-atypical-non-k1-k2-serotype-strain-causing-liver-abscess-and-endocarditis
#18
Baharak Babouee Flury, Valentina Donà, Niccolo Buetti, Hansjakob Furrer, Andrea Endimiani
BACKGROUND: We describe the first two multifocal invasive infections due to Klebsiella pneumoniae recently observed in Switzerland. METHODS: Phenotypic (MIC assays and string test) and molecular analyses (PCR/Sequencing for bla, virulence factor genes and whole genome sequencing for one strain) were performed to characterize the causative K. pneumoniae isolates. RESULTS: Both K. pneumoniae isolates (Kp1 and Kp2) were pan-susceptible to antibiotics and produced narrow-spectrum SHV β-lactamases...
July 17, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28729206/antimicrobial-resistance-patterns-of-gram-negative-bacteria-isolated-from-bloodstream-infections-in-an-iranian-referral-pediatric-hospital-a-six-year-study
#19
Shima Mahmoudi, Masoumeh Mahzari, Maryam Banar, Babak Pourakbari, Mohammad Taghi Haghi Ashtiani, Mohsen Mohammadi, Sepideh Keshavarz Valian, Setareh Mamishi
INTRODUCTION: Bloodstream infections (BSIs) are considered as a major cause of morbidity and mortality in children all over the world. The aim of this study was to describe the epidemiology and antimicrobial resistance patterns of Gram-negative bacteria (GNB) isolated from bloodstream infections (BSIs) in children admitted to the Children Medical Center Hospital (CMC), Tehran, Iran. METHODS: Clinical and microbiological data of the patients with positive blood cultures was collected from March 2011 to September 2016...
July 17, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28728202/-pyogenic-liver-abscess-changes-of-organisms-and-consequences-for-diagnosis-and-therapy
#20
Alexander Mischnik, Winfried Vincenz Kern, Robert Thimme
Liver abscess is a rare but potentially fatal disease with mortality rates of 2 - 12 %. The spectrum of causative microorganisms varies across the world and is changing due to increasing worldwide travel activity. As a result, previously less frequent pathogens must increasingly be considered in the differential diagnosis. The most common pathogens of liver abscess are so-called abscess streptococci, anaerobes and Gram-negative bacteria such as Escherichia coli and Klebsiella pneumoniae. Certain clones among the Gram-negatives, typically among Klebsiella spp...
July 2017: Deutsche Medizinische Wochenschrift
keyword
keyword
25772
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"