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https://www.readbyqxmd.com/read/29149337/mechanisms-leading-to-in-vivo-ceftolozane-tazobactam-resistance-development-during-the-treatment-of-infections-caused-by-mdr-pseudomonas-aeruginosa
#1
Pablo A Fraile-Ribot, Gabriel Cabot, Xavier Mulet, Leonor Periañez, M Luisa Martín-Pena, Carlos Juan, José L Pérez, Antonio Oliver
Objectives: Characterization of the mechanisms driving ceftolozane/tazobactam resistance development in 5 of 47 (10.6%) patients treated for MDR Pseudomonas aeruginosa infections in a Spanish hospital. Methods: Five pairs of ceftolozane/tazobactam-susceptible/resistant P. aeruginosa isolates were studied. MICs were determined by broth microdilution, clonal relatedness was assessed by MLST and resistance mechanisms were investigated by phenotypic and genotypic methods, including WGS...
November 14, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29142383/assessment-of-doripenem-meropenem-and-imipenem-against-respiratory-isolates-of-pseudomonas-aeroginosa-in-a-tertiary-care-hospital-of-north-india
#2
Arti Negi, Mridu Anand, Avinash Singh, Awadhesh Kumar, Chinmoy Sahu, Kashi Nath Prasad
Objective: Pseudomonas aeruginosa is one of the leading pathogen causing healthcare-associated infections, particularly in immunocompromised and critically ill patients. The development of carbapenem resistance in P. aeruginosa infections is worrisome. Data specifically comparing the susceptibility of the three available carbapenems are lacking in the Indian subcontinent. Materials and Methods: We evaluated the minimum inhibitory concentrations (MICs) of the three commonly used carbapenems- imipenem, meropenem, and doripenem against, 435 P...
October 2017: Indian Journal of Critical Care Medicine
https://www.readbyqxmd.com/read/29141346/-etiologic-characteristics-of-shigella-sonnei-strains-isolated-from-some-areas-of-guangdong-province-and-guangxi-zhuang-autonomous-region-of-china-2014-2016
#3
B S Li, L J Chen, B X Ke, J M Lin, L Q Xu, H L Tan, D M He, Y H Liang, C W Ke, Y H Zhang
Objective: To investigated the etiologic characteristics of Shigella (S.) sonnei strains causing outbreaks and sporadic cases in some areas of Guangdong province and Guangxi Zhuang Autonomous Region during 2014-2016. Methods: Fourteen S. sonnei strains isolated from outbreaks and 6 S. sonnei strains from sporadic cases from Guangdong and Liuzhou of Guangxi Zhuang Autonomous Region were tested for antimicrobial resistance and analyzed by pulsed-field gel electrophoresis (PFGE). Six typical strains were selected for whole genome sequencing typing and compared with 51 strains isolated both at home and abroad from NCBI genome database...
November 10, 2017: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
https://www.readbyqxmd.com/read/29137487/emergence-of-fosfomycin-resistance-among-isolates-of-escherichia-coli-harboring-extended-spectrum-and-ampc-%C3%AE-lactamases
#4
Aghil Bahramian, Gita Eslami, Ali Hashemi, Ali Tabibi, Mohsen Heidary
Urinary tract infection (UTI) is a common type of infectious disease globally. The aim of this study was to detect the frequency of fosA3 and fosC2 genes in extended-spectrum β-lactamases (ESBL) and blaDHA, blaCMY-2, and blaCMY-42 genes in AmpC β-lactamases-producing isolates of Escherichia coli. In total, 120 isolates of E. coli were collected from three teaching hospitals between March 2014 and February 2015. Antibiotic susceptibility tests were carried out by disk diffusion method. The presence of blaCMY-2, blaCMY-42, blaDHA, fosA3, and fosC2 genes was detected by polymerase chain reaction (PCR) and sequencing...
November 15, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/29131910/resistant-infantile-bacterial-conjunctivitis-in-egypt-a-microbiology-study
#5
Aiman Abdeltawwab Hashish, Molham Abdelhafez Elbakary, Waleed Abdelhady Allam
PURPOSE: To study the microbiological aspects of infantile bacterial conjunctivitis resistant to empirical topical antibiotic therapy in Egypt. METHODS: Ninety-two eyes of 86 infants with bacterial conjunctivitis were included in this prospective study. They all failed to show evidence of clinical improvement after 2 weeks of empirical topical antibiotic therapy. Conjunctival swabs were obtained from all patients for bacterial culture and antibiotic sensitivity testing...
November 11, 2017: Journal of Pediatric Ophthalmology and Strabismus
https://www.readbyqxmd.com/read/29131156/impact-of-choice-timing-sequence-and-combination-of-broad-spectrum-antibiotics-on-the-outcome-of-allogeneic-haematopoietic-stem-cell-transplantation
#6
F Farowski, V Bücker, J J Vehreschild, L Biehl, R Cruz-Aguilar, C Scheid, U Holtick, N Jazmati, H Wisplinghoff, O A Cornely, M J G T Vehreschild
Recent data link the incidence of intestinal GvHD (iGvHD) after allogeneic haematopoietic stem cell transplantation (aSCT) to exposure with piperacillin-tazobactam or imipenem-cilastatin. To assess relevance of timing, duration, sequence and combination of antibiotic treatment in this setting, we applied a time-dependent model to our aSCT cohort. Patients from the prospective Cologne Cohort of Neutropenic Patients (CoCoNut) undergoing aSCT from January 2007 to April 2013 were included into a time-dependent multivariate Cox proportional hazards regression model with backward-stepwise selection...
November 13, 2017: Bone Marrow Transplantation
https://www.readbyqxmd.com/read/29122480/azolylthioacetamides-as-a-potent-scaffold-for-the-development-of-metallo-%C3%AE-lactamase-inhibitors
#7
Yang Xiang, Ya-Nan Chang, Ying Ge, Joon S Kang, Yi-Lin Zhang, Xiao-Long Liu, Peter Oelschlaeger, Ke-Wu Yang
In an effort to develop new inhibitors of metallo-β-lactamases (MβLs), twenty-eight azolylthioacetamides were synthesized and assayed against MβLs. The obtained benzimidazolyl and benzioxazolyl substituted 1-19 specifically inhibited the enzyme ImiS, and 10 was found to be the most potent inhibitor of ImiS with an IC50 value of 15 nM. The nitrobenzimidazolyl substituted 20-28 specifically inhibited NDM-1, with 27 being the most potent inhibitor with an IC50 value of 170 nM. Further studies with 10, 11, and 27 revealed a mixed inhibition mode with competitive and uncompetitive inhibition constants in a similar range as the IC50 values...
October 20, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/29120560/klebsiella-pneumoniae-oxa-48-in-a-urology-patient-case-report
#8
Ines Jajić, Ana Benčić, Marko Siroglavić, Gernot Zarfel, Boris Ružić, Ivan Pezelj, Branka Bedenić
We present an isolate of Klebsiella pneumoniae OXA-48 isolated in a 68-year-old man who underwent radical prostatectomy due to prostate cancer. The antibiotic susceptibility testing to a wide range of antibiotics was performed by disk diffusion method and determination of minimal inhibitory concentrations. The isolate was classified as multidrug-resistant. It showed intermediate susceptibility to imipenem and meropenem, resistance to ertapenem, and sensitivity only to colistin, amikacin, and trimethoprim-sulfamethoxazole...
March 2017: Acta Clinica Croatica
https://www.readbyqxmd.com/read/29107747/vanillin-selectively-modulates-the-action-of-antibiotics-against-resistant-bacteria
#9
Camila Fonseca Bezerra, Cicera Janaine Camilo, Maria Karollyna do Nascimento Silva, Thiago Sampaio de Freitas, Jaime Ribeiro-Filho, Henrique Douglas Melo Coutinho
The treatment of infections caused by microorganisms that are resistant to antibiotics represent one of the main challenges of medicine today, especially due to the inefficacy of long-term drug therapy. In the search for new alternatives to treat these infections, many researchers have been looking for new substances derived from natural products to replace, or be used in combination with conventional antibiotics. Vanillin is a phenolic compound whose antimicrobial activity has been used in the elimination of pathogens present in fruits and vegetables...
October 28, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29107607/emergence-and-mechanism-of-carbapenem-resistant-escherichia-coli-in-henan-china-2014
#10
Wen-Juan Liang, Hui-Ying Liu, Guang-Cai Duan, Yong-Xin Zhao, Shuai-Yin Chen, Hai-Yan Yang, Yuan-Lin Xi
The emergence and dissemination of carbapenem-resistant Escherichia coli (E. coli) strains is a main risk for global public health, but little is known of carbapenemase producing E. coli in Henan, China. The study was undertaken to investigate the prevalence and mechanism of carbapenem-resistant E. coli strains in a hospital in Xinxiang, Henan, China, 2014. A total of 5 carbapenemase-producing E. coli strains were screened from 1014 isolates. We found that they were all resistant to meropenem and imipenem. Amikacin showed the best sensitivity, with gentamicin coming up next...
October 26, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/29105600/microbiology-in-burns-patients-with-blood-stream-infections-trends-over-time-and-during-the-course-of-hospitalization
#11
Dolores Sousa, Alejandra Ceniceros, Rita Galeiras, Sonia Pértega-Díaz, José-María Gutiérrez-Urbón, María Rodríguez-Mayo, Eugenia López-Suso, Mónica Mourelo-Fariña, Pedro Llinares
BACKGROUND: Bloodstream infections (BSI) are a major cause of mortality in burns patients. Knowledge of the microbiology is crucial to direct empirical therapy. We sought to determine the causative microorganisms and antibiotic resistance in burns patients with BSI. METHODS: All consecutive BSI episodes in a tertiary hospital burns unit from 2000 to 2014 were included. The following three subperiods were compared: 2000-2004, 2005-2009 and 2010-2014. Changes in BSI occurring during early and late hospitalization periods were evaluated...
November 6, 2017: Infectious Diseases
https://www.readbyqxmd.com/read/29099915/carbapenem-resistant-enterobacteriaceae-cre-detection-practices-in-california-what-are-we-missing
#12
Romney M Humphries, Janet A Hindler, Erin Epson, Sam Horwich-Scholefield, Loren G Miller, Job Mendez, Jeremias B Martinez, Jacob Sinkowitz, Darren Sinkowtiz, Christina Hershey, Patricia Marquez, Sandeep Bhaurla, Marcelo Moran, Lindsey Pandes, Dawn Terashita, James A McKinnell
Background: The Clinical and Laboratory Standards Institute (CLSI) revised carbapenem breakpoints for the Enterobacteriaceae in 2010. The number of hospitals that adopted revised CLSI breakpoints and the clinical impact of delayed adoption has not been previously explored. Methods: We performed a cross-sectional, voluntary survey of microbiology laboratories that serve California acute care hospitals and long-term acute care hospitals (LTAC) to determine use of revised CLSI breakpoints...
November 1, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29099716/definition-of-etiological-antibiotic-sensitivity-factors-in-purulent-inflammatory-processes
#13
O Dubovyk, М Mishyna, S Malanchuk, A Kuzmenko, O Kozlov
The purpose of the study - assessment of purulent-inflammatory processes etiologic factors and determination of microbial agents' in forms of plankton and biofilms sensitivity to antibiotics. Clinical microbial strains isolated from patients with purulent-inflammatory processes were the subject of the study. The study material comprised of wound tissue, pus, bandage and suture, catheters and drainage devices. Sensitivity of isolates to antimicrobial preparations with various mechanism of activity on the microbial cells was studied with the help of micro-test system...
October 2017: Georgian Medical News
https://www.readbyqxmd.com/read/29091805/photochemical-degradation-of-the-carbapenem-antibiotics-imipenem-and-meropenem-in-aqueous-solutions-under-solar-radiation
#14
Alejandro Cabrera Reina, Ana B Martínez-Piernas, Yannis Bertakis, Christina Brebou, Nikolaos P Xekoukoulotakis, Ana Agüera, José Antonio Sánchez Pérez
This paper deals with the photochemical fate of two representative carbapenem antibiotics, namely imipenem and meropenem, in aqueous solutions under solar radiation. The analytical method employed for the determination of the target compounds in various aqueous matrices, such as ultrapure water, municipal wastewater treatment plant effluents, and river water, at environmentally relevant concentrations, was liquid chromatography coupled with hybrid triple quadrupole-linear ion trap-mass spectrometry. The absorption spectra of both compounds were measured in aqueous solutions at pH values from 6 to 8, and both compounds showed a rather strong absorption band centered at about 300 nm, while their molar absorption coefficient was in the order from 9 × 10(3)-10(4) L mol(-1) cm(-1)...
October 23, 2017: Water Research
https://www.readbyqxmd.com/read/29091224/in-vitro-activity-of-plazomicin-against-%C3%AE-lactamase-producing-carbapenem-resistant-enterobacteriaceae-cre
#15
Yunliang Zhang, Ankita Kashikar, Karen Bush
Background: Carbapenem-resistant Enterobacteriaceae (CRE) represent an urgent threat because few drugs are available to treat infections caused by these pathogens. Plazomicin is a novel aminoglycoside that recently completed a Phase 3 clinical trial for treatment of infections caused by CRE. Methods: A set of 110 characterized unique CRE patient isolates from central Indiana healthcare centres was tested by microbroth dilution for susceptibility to plazomicin, and to reference aminoglycosides and carbapenems...
October 1, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29091186/antimicrobial-resistance-in-mycobacterium-abscessus-complex-isolated-from-patients-with-skin-and-soft-tissue-infections-at-a-tertiary-teaching-hospital-in-taiwan
#16
Ming-Chun Lee, Pei-Lun Sun, Tsu-Lan Wu, Li-Hsin Wang, Chih-Hsun Yang, Wen-Hung Chung, An-Jing Kuo, Tsui-Ping Liu, Jang-Jih Lu, Cheng-Hsun Chiu, Hsin-Chih Lai, Nan-Yu Chen, Jeng-How Yang, Ting-Shu Wu
Background: Mycobacterium abscessus complex (MABC) is the most common non-tuberculous mycobacterium that causes complicated skin and soft tissue infections (cSSTIs). The selection of antimycobacterial agents for successful treatment of such infections is a critical issue. Objectives: To investigate the antimicrobial susceptibility patterns of MABC isolates from skin and soft tissue to a variety of antimycobacterial agents. Methods: Sixty-seven MABC isolates were collected and partial gene sequencing of secA1, rpoB and hsp65 was used to classify them into three subspecies: M...
October 1, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29090007/corrigendum-to-spread-of-tem-vim-shv-and-ctx-m-%C3%AE-lactamases-in-imipenem-resistant-gram-negative-bacilli-isolated-from-egyptian-hospitals
#17
El Sayed Hamdy Mohammed, Ahmed Elsadek Fakhr, Hanan Mohammed El Sayed, Said Abd Elmohsen Al Johery, Wesam Abdel Ghani Hassanein, Ahmed Mansour Alzohairy
[This corrects the article DOI: 10.1155/2016/8382605.].
2017: International Journal of Microbiology
https://www.readbyqxmd.com/read/29089425/klebsiella-pneumoniae-carbapenemase-2-kpc-2-substitutions-at-ambler-position-asp179-and-resistance-to-ceftazidime-avibactam-unique-antibiotic-resistant-phenotypes-emerge-from-%C3%AE-lactamase-protein-engineering
#18
Melissa D Barnes, Marisa L Winkler, Magdalena A Taracila, Malcolm G Page, Eric Desarbre, Barry N Kreiswirth, Ryan K Shields, Minh-Hong Nguyen, Cornelius Clancy, Brad Spellberg, Krisztina M Papp-Wallace, Robert A Bonomo
The emergence of Klebsiella pneumoniae carbapenemases (KPCs), β-lactamases that inactivate "last-line" antibiotics such as imipenem, represents a major challenge to contemporary antibiotic therapies. The combination of ceftazidime (CAZ) and avibactam (AVI), a potent β-lactamase inhibitor, represents an attempt to overcome this formidable threat and to restore the efficacy of the antibiotic against Gram-negative bacteria bearing KPCs. CAZ-AVI-resistant clinical strains expressing KPC variants with substitutions in the Ω-loop are emerging...
October 31, 2017: MBio
https://www.readbyqxmd.com/read/29081367/first-case-of-new-delhi-metallo-%C3%AE-lactamase-in-klebsiella-pneumoniae-from-ecuador-an-update-for-south-america
#19
Daniel Romero-Alvarez, Jorge Reyes, Viviana Quezada, Carolina Satán, Nelson Cevallos, Sofía Barrera, Gabriel Trueba, Luis E Escobar, José E Villacís
OBJECTIVES: To describe a clinical case of Klebsiella pneumoniae harboring New Delhi metallo-β-lactamase (NDM) plasmid in Ecuador and to present a map of reports of NDM isolates in South America. METHODS: We used the Modified Hodge Test, Carbapenem Inactivation Method, the synergy with imipenem-EDTA disk method, and Rapidec Carba NP for identification of antibiotic resistance mechanisms. The presence of resistant genes was explored with a conjugation assay, and molecular confirmation of NDM with PCR and DNA sequencing...
October 25, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/29076442/-carbapenemase-producing-enterobacteriaceae-in-the-netherlands-unnoticed-spread-to-several-regions
#20
T Leenstra, T Bosch, A L Vlek, M J M Bonten, I M van der Lubben, S C de Greeff
- Carbapenemase producing Enterobacteriaceae (CPE), including Klebsiella pneumoniae and Escherichia coli, are only sporadically seen in the Netherlands and then mainly in patients who have been transferred from foreign hospitals.- CPE are resistant to virtually all beta-lactam antibiotics, including carbapenems, e.g., meropenem and imipenem. Several genes, e.g., OXA-48, KPC and NDM-1, code for carbapenemase enzymes that deactivate carbapenems.- Control of CPE focuses on timely identification of patients who are infected or are carriers and the application of preventive measures to prevent spread...
2017: Nederlands Tijdschrift Voor Geneeskunde
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