Abstract：
:In order to study the possible phenotypic and genotypic changes related to glycopeptide pressure on enterococci, a study was undertaken using stepwise in vitro exposure to achieve the following objectives: (i) to evaluate the development of resistance and cross-resistance between vancomycin and teicoplanin; (ii) to determine the stability of the acquired level of resistance; (iii) to determine the phenotypic and genotypic changes related to glycopeptide pressure; and (iv) to assess the spectrum of antibiotic-susceptibility of all strains. Our results showed that no variants resistant to glycopeptides could be selected after in vitro glycopeptide exposure experiments. However some strains showed increased MIC values: 8 mg/l to vancomycin in eight strains selected by vancomycin itself, while teicoplanin produced intermediate values to vancomycin in only three strains. The phenotypes were stable in vitro after numerous passages in antibiotic-free medium and three out of nine strains with a changed MIC level, showed 40, 42 and 43 kDa proteins in cell membrane preparations. The profile of antibiotic resistance was comparable in all isogenic strains tested with the exception of three selected strains that became susceptible to penicillin G. The pressure produced by glycopeptides, particularly vancomycin has contributed to an increased level of MIC that can influence the acquisition and/or full expression of this resistance.
journal_name
Int J Antimicrob Agentsjournal_title
International journal of antimicrobial agentsauthors
Puntorieri M,Cafiso V,Santagati M,Messina C,Azzarelli C,Catalano V,Bonfiglio G,Giuseppe N,Stefania Sdoi
10.1016/s0924-8579(99)00082-5subject
Has Abstractpub_date
1999-08-01 00:00:00pages
333-9issue
4eissn
0924-8579issn
1872-7913pii
S0924857999000825journal_volume
12pub_type
杂志文章abstract：:Parachlamydia acanthamoebae has been shown to be resistant to fluoroquinolones. In this study, we determined the susceptibility of Neochlamydia hartmannellae and Simkania negevensis to quinolones using amoebal co-culture in the presence of serial dilutions of ciprofloxacin. The gyrA and parC quinoline resistance-deter...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2006.03.009
更新日期：2006-06-01 00:00:00
abstract：:Octenidine (OCT) is a widely used antiseptic molecule with an antimicrobial spectrum covering a broad range of bacteria and fungi. However, the detailed molecular mechanism of killing has not yet been elucidated. The objective of our study was to investigate the mode of action of OCT's potent effect on Gram-negative b...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2020.106146
更新日期：2020-11-01 00:00:00
abstract：:Isolates of Streptococcus pneumoniae collected over the first 4 years of the PROTEKT study were tested for susceptibility to penicillin, azithromycin and telithromycin. A total of 20,750 isolates were collected from 39 countries. Penicillin non-susceptibility rates were stable over the study period; overall, 21.8% of ...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章,多中心研究
doi：10.1016/j.ijantimicag.2005.04.022
更新日期：2005-12-01 00:00:00
abstract：:We studied an in vitro model of continuous venovenous haemofiltration to determine levofloxacin adsorption by polyacrylonitrile (PAN) filters. Four doses of levofloxacin (5, 25, 50 and 100 mg) were used, resulting in circulating concentrations of levofloxacin at 120 min of 3.56+/-0.14, 15.84+/-2.08, 31.42+/-1.95 and 5...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2006.03.025
更新日期：2006-08-01 00:00:00
abstract：:Nationwide monitoring of antimicrobial resistance in Campylobacter isolated from food-producing animals on farms was performed in Japan. A total of 468 Campylobacter isolates were obtained during the period from June 1999 to March 2001. Campylobacter species showed high frequencies of resistance to oxytetracycline and...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2004.03.017
更新日期：2004-09-01 00:00:00
abstract：:Two hundred and twenty-eight episodes of infective endocarditis in adult patients (mean age 36 years) were reviewed retrospectively. There were 183 episodes (80%) of native valve, 15 (7%) early prosthetic valve and 30 (13%) late prosthetic valve endocarditis. The most common predisposing factor was rheumatic valvular ...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/s0924-8579(01)00344-2
更新日期：2001-07-01 00:00:00
abstract：:As a follow-up to our 2009 survey, in order to explore opinion and practice on the epidemiology and management of meticillin-resistant Staphylococcus aureus (MRSA) in Europe, we conducted a second survey to elicit current opinions on this topic, particularly around antibiotic choice, dose, duration and route of admini...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/S0924-8579(15)30002-9
更新日期：2015-04-24 00:00:00
abstract：:The emergence of SARS-coronavirus-2 (SARS-CoV-2) has led to a global pandemic disease referred to as coronavirus disease 19 (COVID-19). Hydroxychloroquine (CLQ-OH)/azithromycin (ATM) combination therapy is currently being tested for the treatment of COVID-19, with promising results. However, the molecular mechanism of...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2020.106020
更新日期：2020-08-01 00:00:00
abstract：:S fimbrial adhesins (Sfa) represent virulence factors of E. coli wild-type strains causing urinary tract infections and meningitis of the new born. In order to determine the influence of subinhibitory concentration of antibiotics on the expression of the sfa gene cluster, a wild-type strain carrying the lacZ gene, cod...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/0924-8579(93)90060-i
更新日期：1993-01-01 00:00:00
abstract：:Gatifloxacin, grepafloxacin, moxifloxacin and trovafloxacin are fluoroquinolones with enhanced Gram-positive activity while retaining broad-spectrum activity against Gram-negative pathogens. Levofloxacin and ciprofloxacin are older quinolones with broad activity against Gram-negative pathogens and borderline activity ...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/s0924-8579(99)00143-0
更新日期：2000-02-01 00:00:00
abstract：:Both zidovudine (ZDV) and stavudine (D4T) must be intracellularly converted to their respective active triphosphate anabolites (ZDV-TP and D4T-TP). It is hypothesized that the combination of ZDV and D4T may lead to altered formation of phosphorylated anabolites for either drug. The objective of this study was to inves...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/s0924-8579(97)00041-1
更新日期：1997-09-01 00:00:00
abstract：:The mutant prevention concentration (MPC) was determined by population analysis using six fluoroquinolone-susceptible isolates of Pseudomonas aeruginosa applied to fluoroquinolone-containing agar plates. The MPCs were 3 mg/L and 9.5 mg/L for ciprofloxacin and levofloxacin, respectively. At high concentrations of eithe...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2005.10.005
更新日期：2006-02-01 00:00:00
abstract：:The extracts from the starfish Asterina pectinifera obtained using various organic solvents and distilled water were tested for their antimicrobial activities against fungi and yeasts. The methanol and water extracts were found to be the most active and Aspergillus spp. and Cryptococcus neoformans proved to be sensiti...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/s0924-8579(98)00079-x
更新日期：1999-01-01 00:00:00
abstract：:The worldwide epidemic of antibiotic resistance is in danger of ending the golden age of antibiotic therapy. Resistance impacts on all areas of medicine, and is making successful empirical therapy much more difficult to achieve. Antibiotic choices are often severely restricted, and the pipeline of new antibiotics is a...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章,评审
doi：10.1016/S0924-8579(09)70549-7
更新日期：2009-08-01 00:00:00
abstract：:Macrolides, especially clarithromycin (CLA), remain the cornerstone of therapy for Mycobacterium abscessus complex infections. The purpose of this study was to gather results from in vitro drug susceptibility testing of M. abscessus and Mycobacterium massiliense for the combination of CLA with various other agents, in...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2016.12.003
更新日期：2017-03-01 00:00:00
abstract：:Uptake of [14C]-azithromycin into THP-1 human monocytes was determined at pH 7.4, 6.8 or 5.5 over 4-log antibiotic concentrations for 24 h under a number of conditions. Stimulation of cells was with bacteria, latex beads, lipopolysaccharide (LPS), or zymogen A. Subcellular organelle disposition was determined after is...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/s0924-8579(02)00187-5
更新日期：2002-11-01 00:00:00
abstract：:Biofilms are complex bacterial structures protected by a self-produced polymer matrix that enables survival in hostile environments. Biofilms are more resistant to antibiotics than their planktonic counterparts and are therefore more difficult to eradicate. The aim of this study was to investigate the influence of van...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2013.12.003
更新日期：2014-03-01 00:00:00
abstract：:The antimicrobial activities of levofloxacin, clarithromycin and KRM-1648 against Mycobacterium tuberculosis (MTB) and Mycobacterium avium complex (MAC) residing in Mono Mac 6 human macrophage-like cells (MM6-Mphis) and A-549 human type II alveolar epithelial cells (A-549 cells) were studied. We measured the antimicro...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/s0924-8579(00)00163-1
更新日期：2000-09-01 00:00:00
abstract：:The in vitro activity of moxifloxacin was compared with that of penicillin G, amoxycillin/clavulanate, cefoxitin, erythromycin, clindamycin and metronidazole against 158 isolates associated with periodontal infections. MIC(50)/MIC(90) values of moxifloxacin were respectively 0.06/0.5 mg/l for Porphyromonas gingivalis ...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/s0924-8579(02)00190-5
更新日期：2002-12-01 00:00:00
abstract：:Growth of Staphylococcus aureus in the presence of salicylate leads to reduced ciprofloxacin and ethidium accumulation and increased resistance to ethidium. Salicylate induced reduction in ciprofloxacin accumulation is energy-independent while salicylate induced alterations in ethidium accumulation and efflux is proto...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/s0924-8579(02)00162-0
更新日期：2002-09-01 00:00:00
abstract：:Infections caused by multidrug-resistant bacteria, including Pseudomonas aeruginosa, are threatening public health worldwide. Therefore, a novel antibacterial agent is needed to treat these infections. Here, we investigated the in vitro and in vivo activities of a novel siderophore-conjugated cephalosporin, LCB10-0200...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2017.06.001
更新日期：2017-12-01 00:00:00
abstract：:Acinetobacter baumannii has emerged as an important nosocomial pathogen owing to its increasing resistance to most, if not all, antibiotics in clinical use. We recently reported the occurrence of extensively drug-resistant (XDR) A. baumannii isolates in a Malaysian tertiary hospital. The genome of one of these XDR iso...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2014.10.015
更新日期：2015-02-01 00:00:00
abstract：:A gerbil model of acute otitis media induced by Streptococcus pneumoniae plus Haemophilus influenzae was used to assess the efficacy of amoxicillin/clavulanic acid (A/C) (1.5/0.3, 2.5/0.5 and 10/2 mg/kg) and erythromycin (2.5, 10, 20 and 50 mg/kg) with or without acetaminophen. The amoxicillin/clavulanic acid MIC was ...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2003.05.016
更新日期：2004-01-01 00:00:00
abstract：:In the present pilot study we investigated the effect of food ingestion on target site pharmacokinetics of linezolid, the first clinically approved oxazolidinone. For this purpose we determined free concentrations of linezolid at steady state in the interstitial space fluid of skeletal muscle and subcutaneous adipose ...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2005.09.017
更新日期：2006-02-01 00:00:00
abstract：:Nacubactam is a novel non-β-lactam diazabicyclooctane β-lactamase inhibitor under development for the treatment of serious Gram-negative infections. This study assessed the efficacy of human-simulated epithelial lining fluid (ELF) exposure of nacubactam in combination with meropenem against AmpC-overproducing (n=4) an...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2019.10.019
更新日期：2020-02-01 00:00:00
abstract：:Therapeutic drug monitoring for critically ill patients receiving piperacillin/tazobactam is described as a useful tool. However, the minimum inhibitory concentration of piperacillin depends on a sufficiently high concentration of tazobactam in case of β-lactamase-producing strains. Therefore, the relationship between...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2016.06.013
更新日期：2016-10-01 00:00:00
abstract：:Few studies have studied the frequency of over-the-counter acquisition of antibiotics in western countries. In order to provide an insight into these practices in Malta, attitudes towards antibiotic use in the general public were researched through a structured interview. Nineteen percent admitted that they took antib...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/s0924-8579(02)00194-2
更新日期：2002-10-01 00:00:00
abstract：:The treatment of bloodstream infections remains a significant challenge, with persisting high mortality and morbidity. To optimize antimicrobial therapy, the clinician must possess knowledge of the pharmacokinetic and pharmacodynamic properties of commonly used antimicrobials, and how these parameters may be affected ...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章,评审
doi：10.1016/S0924-8579(09)70568-0
更新日期：2009-01-01 00:00:00
abstract：:The recent re-emergence of tuberculosis, especially the multidrug-resistant cases, has highlighted the importance of screening effective novel drugs against Mycobacterium tuberculosis. In this study, the in vitro activities of small peptides isolated from snake venom were investigated against multidrug-resistant M. tu...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/s0924-8579(03)00110-9
更新日期：2003-08-01 00:00:00
abstract：:Escherichia coli O25b-B2-ST131 isolates harbouring bla(CTX-M-15) are distributed worldwide. The bla(CTX-M-15) transposition unit has often been found on plasmids and the genetic contexts have been examined; however, less is known about the frequency and contexts of the bla(CTX-M-15) transposition unit on the chromosom...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2013.08.005
更新日期：2013-12-01 00:00:00
