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Beta lactam

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https://www.readbyqxmd.com/read/28087620/e152a-substitution-drastically-affects-ndm-5-activity
#1
Gaurav Kumar, Bagre Issa, Debasish Kar, Sarmistha Biswal, Anindya S Ghosh
New Delhi Metallo beta-lactamase (NDM) is of significant public health concern due to its enormous potential to hydrolyse all major beta-lactams including carbapenems. Amino acid substitutions outside the active site reportedly affect NDM beta-lactamase activities. Here, the effect of amino acid substitutions in the possible omega-like loop region of NDM-5 has been elucidated. Overall, three substitution mutations near active site of NDM-5 were done, namely, E152A, S191A, and D223A and subsequently, the change in antimicrobial resistance was monitored upon expressing each mutant in a suitable host...
January 12, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28069659/mrsa-strains-carrying-the-novel-mecc-gene-full-genome-sequencing-identifies-in-the-genetic-background-several-determinants-that-modulate-the-resistant-phenotype
#2
Catarina Milheiriço, Hermínia de Lencastre, Alexander Tomasz
Most MRSA strains are resistant to beta-lactam antibiotics due to the presence of the mecA gene encoding an extra penicillin-binding protein (PBP2A) that has low affinity to virtually all beta-lactam antibiotics. Recently, a new resistance determinant - the mecC gene - was identified in S. aureus isolates recovered from humans and dairy cattle. Although having typically low MICs to beta-lactam antibiotics, MRSA strains with the mecC determinant are also capable of expressing high levels of oxacillin resistance when in an optimal genetic background...
January 9, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28068956/cost-effectiveness-of-antibiotic-treatment-strategies-for-community-acquired-pneumonia-results-from-a-cluster-randomized-cross-over-trial
#3
Cornelis H van Werkhoven, Douwe F Postma, Marie-Josee J Mangen, Jan Jelrik Oosterheert, Marc J M Bonten
BACKGROUND: To determine the cost-effectiveness of strategies of preferred antibiotic treatment with beta-lactam/macrolide combination or fluoroquinolone monotherapy compared to beta-lactam monotherapy. METHODS: Costs and effects were estimated using data from a cluster-randomized cross-over trial of antibiotic treatment strategies, primarily from the reduced third payer perspective (i.e. hospital admission costs). Cost-minimization analysis (CMA) and cost-effectiveness analysis (CEA) were performed using linear mixed models...
January 10, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28064542/antibiotic-treatment-patterns-costs-and-resource-utilization-among-patients-with-community-acquired-pneumonia-a-us-cohort-study
#4
Christopher J Llop, Edward Tuttle, Glenn S Tillotson, Kerry LaPlante, Thomas M File
OBJECTIVES: The current treatment options for patients with community-acquired pneumonia (CAP) often present a trade-off between the potential for treatment failure and safety concerns. We set out to investigate real-world outcomes associated with the use of currently available antimicrobial treatment options for CAP in both the outpatient and inpatient (non-intensive care unit [ICU]) settings. METHODS: This claims-based retrospective study included adult patients diagnosed with CAP and treated with antibiotic therapies, including any oral fluoroquinolone, macrolide, or beta-lactam monotherapy in the outpatient setting, and intravenous (IV) levofloxacin or IV azithromycin/ceftriaxone in the inpatient setting...
January 9, 2017: Hospital Practice (Minneapolis)
https://www.readbyqxmd.com/read/28056274/-serotype-identification-and-antibiotic-susceptibility-of-shiga-toxin-producing-escherichia-coli-in-the-weishan-area-in-shandong-province-china
#5
C C Shao, B Hu, Z W Bi, Z Q Kou, M Fang, B L Chen, Z Q Bi
Objective: To determine the serotypes and drug resistance profiles of Shiga toxin-producing Escherichia coli (STEC) in animal stools from the Weishan area in Shandong Province, China. To provide the basis for further study. Methods: Five hundred animal stool samples (from pigs, cattle, sheep, dogs and birds) were collected from the Weishan area and STEC strains were isolated from these samples. Strains were serotyped by a serum agglutination test, and their drug resistance profiles were determined through antimicrobial sensitivity experiments...
January 6, 2017: Zhonghua Yu Fang Yi Xue za Zhi [Chinese Journal of Preventive Medicine]
https://www.readbyqxmd.com/read/28040167/genetic-diversity-safety-and-technological-characterization-of-lactic-acid-bacteria-isolated-from-artisanal-pico-cheese
#6
M F P Domingos-Lopes, C Stanton, P R Ross, M L E Dapkevicius, C C G Silva
A total of 114 lactic acid bacteria were isolated at one and 21 days of ripening from a traditional raw cow's milk cheese without the addition of starter culture, produced by three artisanal cheese-makers in Azores Island (Pico, Portugal). Identification to species and strain level was accomplished by16S rRNA gene and PFGE analysis. Carbohydrate utilization profiles were obtained with the relevant API kits. Isolates were evaluated according to safety and technological criteria. The most frequently observed genus identified by 16S rRNA sequencing analysis was Enterococcus, whereas API system mostly identified Lactobacillus...
May 2017: Food Microbiology
https://www.readbyqxmd.com/read/28033162/an-ex-vivo-model-to-decipher-the-impact-of-extracorporeal-membrane-oxygenation-on-beta-lactam-degradation-kinetics
#7
Cyril Leven, Pierre Fillâtre, Antoine Petitcollin, Marie-Clémence Verdier, Jérôme Laurent, Nicolas Nesseler, Yoann Launey, Pierre Tattevin, Eric Bellissant, Erwan Flécher, Florian Lemaitre
BACKGROUND: As a consequence of drug sequestration, increase in volume of distribution or alteration of elimination, extracorporeal membrane oxygenation (ECMO) might lead to inadequate plasma concentrations of vital drugs. The aim of this experimental study was to develop an ex vivo model to better characterize the impact of ECMO procedure on beta-lactam antibiotics pharmacokinetics. METHODS: Plasma concentrations of cefotaxime, ceftazidime, cefepime, piperacillin, oxacillin, amoxicillin, and ceftriaxone were measured in an ex vivo ECMO circuit primed with whole human blood and compared to controls stored in glass tubes and polyvinyl chloride (PVC) tubing...
December 23, 2016: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28018328/a-mechanism-of-synergistic-effect-of-streptomycin-and-cefotaxime-on-ctx-m-15-type-%C3%AE-lactamase-producing-strain-of-e-cloacae-a-first-report
#8
Lubna Maryam, Asad U Khan
A blaCTX-M-15 gene is one of the most prevalent resistant marker found in member of enterobacteriaceae. It encodes cefotaxime hydrolysing β-lactamase-15 (CTX-M-15) causing resistance against beta lactam antibiotics. Since single antibiotic therapy fails to control infection caused by multidrug resistance strain, therefore combination therapy was came into practice as an effective treatment. We have first time explained the mechanism where two antibiotics of different classes work against resistant strains...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28011969/comparison-of-quinolone-and-beta-lactam-resistance-among-escherichia-coli-strains-isolated-from-urinary-tract-infections
#9
Zahra Tayebi, Hamid Heidari, Hossein Kazemian, Seyed Mohammad Ghafoori, Shahram Boroumandi, Hamidreza Houri
The growing frequency of antibiotic resistances is now a universal problem. Increasing resistance to new generations of β-lactam and quinolone antibiotics in multidrug-resistant Enterobacteriaceae isolates is considered an emergency health issue worldwide. The aim of this study was to evaluate plasmid-mediated quinolone resistance genes in ESBL-producing Escherichia coli isolated from urinary tract infections (UTIs). In our study ESBL-producing isolates were assessed by screening methods. After determination of antimicrobial susceptibility testing, detection of ESBLs and quinolone resistance genes was performed...
1, 2016: Le Infezioni in Medicina
https://www.readbyqxmd.com/read/27988390/low-antibiotic-resistance-among-anaerobic-gram-negative-bacteria-in-periodontitis-5-years-following-metronidazole-therapy
#10
G Dahlen, H R Preus
The objective of this study was to assess antibiotic susceptibility among predominant Gram-negative anaerobic bacteria isolated from periodontitis patients who 5 years prior had been subject to mechanical therapy with or without adjunctive metronidazole. One pooled sample was taken from the 5 deepest sites of each of 161 patients that completed the 5 year follow-up after therapy. The samples were analyzed by culture. A total number of 85 anaerobic strains were isolated from the predominant subgingival flora of 65/161 patient samples, identified, and tested for antibiotic susceptibility by MIC determination...
December 14, 2016: Anaerobe
https://www.readbyqxmd.com/read/27986623/one-year-incidence-of-prosthetic-joint-infection-in-total-hip-arthroplasty-a-cohort-study-with-linkage-of-the-danish-hip-arthroplasty-register-and-danish-microbiology-databases
#11
P H Gundtoft, A B Pedersen, H C Schønheyder, J K Møller, S Overgaard
OBJECTIVE: To examine the trend of Prosthetic Joint Infections (PJI) following primary total hip arthroplasty (THA) and the antimicrobial resistance of the bacteria causing these infections. MATERIALS AND METHODS: We identified a population-based cohort of patients in the Danish Hip Arthroplasty Register (DHR) who had primary THA and received their surgery in Jutland or Funen between 2005 and 2014. We followed the patients until revision, emigration, death, or up to 1-year of follow-up...
December 13, 2016: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/27966434/clindamycin-induced-acute-generalised-exanthematous-pustulosis-five-cases-and-a-review-of-the-literature
#12
T J L Smeets, N Jessurun, L Härmark, S H Kardaun
Acute generalised exanthematous pustulosis (AGEP) is a rare but serious cutaneous adverse drug reaction, often related to antibiotics such as beta-lactams or macrolides. However, it is rarely associated with clindamycin which belongs to the lincosamide antibiotics. The Netherlands Pharmacovigilance Centre Lareb received five reports of AGEP associated with the use of clindamycin. We present these five cases and provide support for this association from the Lareb database, the database of the WHO Collaborating Centre for International Drug Monitoring (Vigibase™), the database of the European Medicine Agency (Eudravigilance), and from a mini review of the literature...
December 2016: Netherlands Journal of Medicine
https://www.readbyqxmd.com/read/27956906/prevalence-of-beta-lactam-allergy-a-retrospective-chart-review-of-drug-allergy-assessment-in-a-predominantly-pediatric-population
#13
Elissa M Abrams, Andrew Wakeman, Tom V Gerstner, Richard J Warrington, Alexander G Singer
BACKGROUND: Research suggests that 90% of patients labeled beta-lactam allergic are able to tolerate penicillins following further assessment. This study aims to define and describe the frequency of true beta-lactam allergy following allergy patient evaluation in a predominantly pediatric population. METHODS: 306 primary care patients referred between January 2010 and June 2015 were assessed for a suspected beta-lactam allergy. Patient demographics, history and test results were extracted from electronic medical records...
2016: Allergy, Asthma, and Clinical Immunology
https://www.readbyqxmd.com/read/27956778/study-of-antimicrobial-resistance-due-to-extended-spectrum-beta-lactamase-producing-escherichia-coli-in-healthy-broilers-of-jabalpur
#14
Arpita Shrivastav, R K Sharma, Y P Sahni, Neeraj Shrivastav, Vidhi Gautam, Sachin Jain
AIM: To study the prevalence of antimicrobial resistance due to extended spectrum beta-lactamase (ESBL)-producing Escherichia coli in samples collected from the ceca of healthy broilers of poultry sale outlets (PSOs) Jabalpur. MATERIALS AND METHODS: A total of 400 cecal swab samples were taken randomly from freshly slaughtered poultry of 39 PSOs located at four different zones or areas of Jabalpur and were screened for the presence of ESBL-producing E. coli using standard methods...
November 2016: Veterinary World
https://www.readbyqxmd.com/read/27943428/synthesis-of-2-mercaptoacetyl-l-2-14-c-tryptophan-as-a-selective-metallo-%C3%AE-lactamase-inhibitor-via-2-14-c-indole-based-on-chiral-pool-strategy
#15
Gholamhossein Shirvani, Abbas Shockravi, Mohsen Amini, Nader Saemian
Metallo-beta-lactamase enzymes make bacteria resistant to a broad range of commonly used beta-lactam antibiotics. Several thiol derivatives of L-amino acids have been shown their inhibitory effects against the metallo-β-lactamase IMP-1. In this study, (2-mercaptoacetyl)-L-tryptophan as a new inhibitor of MBLs labeled with carbon-14 in the 2-position of the indole ring was prepared from [2-(14) C]indole as a key synthetic intermediate based on chiral pool strategy. The overall synthesis was carried out in ten-step with the overall radiochemical yield 3...
December 12, 2016: Journal of Labelled Compounds & Radiopharmaceuticals
https://www.readbyqxmd.com/read/27942358/ndm-1-and-rmtc-producing-klebsiella-pneumoniae-isolates-in-turkey
#16
Tulin Guven Gokmen, Togrul Nagiyev, Melda Meral, Cansu Onlen, Farzad Heydari, Fatih Koksal
BACKGROUND: The resistance of aminoglycosides in strains that produce beta-lactamase can be developed through the multidrug resistant encoding genes carried by common plasmids. Recently, the association between 16S rRNA methyltransferase resistance and beta-lactamase enzymes carried by the same plasmids has drawn increased attention from researchers, particularly the association in aminoglycoside-resistant strains with a minimum inhibitory concentration (MIC) of ≥ 256 µg/mL. OBJECTIVES: We aimed to investigate the co-existence of 16S rRNA methyltransferase and beta-lactamase genes in multidrug resistant (MDR) Klebsiella pneumoniae strains isolated from clinical samples...
October 2016: Jundishapur Journal of Microbiology
https://www.readbyqxmd.com/read/27940946/systematic-review-and-meta-analysis-of-acute-kidney-injury-associated-with-concomitant-vancomycin-and-piperacillin-tazobactam
#17
REVIEW
Drayton A Hammond, Melanie N Smith, Chenghui Li, Sarah M Hayes, Katherine Lusardi, P Brandon Bookstaver
Concomitant vancomycin and piperacillin/tazobactam may be associated with increased acute kidney injury (AKI) compared to vancomycin without piperacillin/tazobactam. A systematic search of Medline, Cochrane Library, and Scopus through October 2016 using ["vancomycin" and "piperacillin" and "tazobactam"] and ["AKI" or "acute renal failure" or "nephrotoxicity"] and registered meta-analysis (PROSPERO: CRD42016041646) with relevant scenarios was performed. From 307 results, fourteen observational studies totaling 3549 patients were analyzed...
December 10, 2016: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/27935702/alternate-drug-delivery-utilizing-%C3%AE-lactam-cores-syntheses-and-biological-evaluation-of-%C3%AE-lactams-bearing-isocyanate-precursors
#18
Mark W Majewski, Patricia A Miller, Allen G Oliver, Marvin J Miller
The synthesis of a small set of β-lactams containing isocyanate precursors is described. The release of the isocyanate precursor in model hydrolysis experiments was substantiated by trapping experiments, thus confirming that β-lactams can be designed that are capable of releasing alternatively reactive species. Preliminary biological assessments are also briefly discussed.
December 21, 2016: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/27935180/management-of-early-onset-neonatal-sepsis-differs-in-the-north-and-south-of-scandinavia
#19
Martin Drageset, Jon Widding Fjalstad, Sven Mortensen, Claus Klingenberg
AIM: This study compared the management and outcomes of early-onset neonatal sepsis (EONS) in two tertiary neonatal units in Denmark and Norway. METHODS: We retrospectively studied all infants diagnosed with EONS between April 2010 and March 2013 and managed at Odense University Hospital, Denmark, and the University Hospital of North Norway, Norway. Clinical and laboratory data were collected from patient records. RESULTS: We identified 137 EONS cases in Denmark and 101 in Norway...
December 9, 2016: Acta Paediatrica
https://www.readbyqxmd.com/read/27929242/community-acquired-pneumonia-in-adults-diagnosis-and-management
#20
Alexander Kaysin, Anthony J Viera
Community-acquired pneumonia is a leading cause of death. Risk factors include older age and medical comorbidities. Diagnosis is suggested by a history of cough, dyspnea, pleuritic pain, or acute functional or cognitive decline, with abnormal vital signs (e.g., fever, tachycardia) and lung examination findings. Diagnosis should be confirmed by chest radiography or ultrasonography. Validated prediction scores for pneumonia severity can guide the decision between outpatient and inpatient therapy. Using procalcitonin as a biomarker for severe infection may further assist with risk stratification...
November 1, 2016: American Family Physician
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