Abstract：
:Molecular epidemiology studies aiming at understanding the acquisition of antimicrobial resistance by clinical isolates of Klebsiella pneumoniae are regularly published; however, information on the genes that contribute to its characteristic phenotype of resistance to antibiotics (intrinsic resistome) is scarce. To fill this gap, a K. pneumoniae transposon mutant library was screened and 171 mutants presenting changes in their susceptibility to antibiotics were selected, in which the transposon insertion site was determined in 75. Twenty-seven mutants for which insertion points had been previously identified were included in the analysis. A total of 102 mutants were selected for further studies. In 70 mutants the transposon was inserted in a gene with a known function, whilst in 19 the insertion occurred in genes encoding proteins with unknown functions and 13 insertions occurred in intergenic regions. Moreover, 87 of the insertions were localised in the chromosome, with 15 insertions located in the two plasmids carried by this strain. Whereas some of the mutated genes are already known to be involved in antimicrobial resistance (ampG, acrB, tolC), several of them are involved in regular processes of bacterial physiology, including K. pneumoniae virulence. Together with results published for other organisms, these results support that determinants involved in basic processes of bacterial physiology may contribute to antimicrobial resistance. These findings also indicate that, besides acquired resistance genes, plasmids may harbour other genes belonging to their backbone that can also be involved in resistance.
journal_name
Int J Antimicrob Agentsjournal_title
International journal of antimicrobial agentsauthors
Bernardini A,Cuesta T,Tomás A,Bengoechea JA,Martínez JL,Sánchez MBdoi
10.1016/j.ijantimicag.2018.09.012subject
Has Abstractpub_date
2019-01-01 00:00:00pages
29-33issue
1eissn
0924-8579issn
1872-7913pii
S0924-8579(18)30271-1journal_volume
53pub_type
杂志文章abstract：:Coxiella burnetii is the bacterial agent of Q fever in humans. Acute Q fever generally manifests as a flu-like illness and is typically self-resolving. In contrast, chronic Q fever usually presents with endocarditis and is often life-threatening without appropriate antimicrobial therapy. Unfortunately, available optio...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2010.05.017
更新日期：2010-10-01 00:00:00
abstract：:Carbapenemase-producing Enterobacteriaceae (CPE) are emerging multidrug-resistant bacteria responsible for invasive infections, including prosthetic joint infections (PJIs). Local administration of colistin may provide bactericidal concentrations in situ. This study evaluated the efficacy of a colistin-impregnated cem...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2019.07.009
更新日期：2019-10-01 00:00:00
abstract：:Prolonged infusion (PI) of β-lactam antibiotics is increasingly used in order to optimise antibiotic exposure in critically ill patients. Physicians are often not aware of a number of subtleties that may jeopardise the treatment. In this clinically based paper, we stress pragmatic issues, such as the importance of a l...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2015.01.007
更新日期：2015-05-01 00:00:00
abstract：:Clinafloxacin, levofloxacin, sparfloxacin and trovafloxacin were tested by Etest against 188 Streptococcus pneumoniae isolates. Clinafloxacin and trovafloxacin were 2-4-fold more potent than sparfloxacin and 8-fold more than levofloxacin. Two isolates, both serotype 6, with high-level quinolone resistance (> or = 8 mi...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/s0924-8579(97)00053-8
更新日期：1998-02-01 00:00:00
abstract：:The objective of this study was to comprehensively identify the target genes regulated by the two-component regulatory system VraSR in Staphylococcus aureus and to clarify the role of VraSR in low-level vancomycin resistance. Expression of vraS was determined by real-time quantitative reverse transcriptase PCR (qRT-PC...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2016.02.003
更新日期：2016-05-01 00:00:00
abstract：:In this study, 2275 clinical isolates of 49 species of non-tuberculous mycobacteria isolated in The Netherlands were subjected to standardised drug susceptibility testing using the Middlebrook 7H10 agar dilution method. Clarithromycin and rifabutin were most active, with 87% and 83% of all isolates, respectively, bein...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2009.09.023
更新日期：2010-02-01 00:00:00
abstract：:Multidrug-resistant and extensively drug-resistant tuberculosis (MDR/XDR-TB) are problematic to manage, especially in patients with acquired immune deficiency syndrome (AIDS). There is therefore a dire need for effective anti-MDR/XDR-TB agents. We have previously shown that agents that inhibit the efflux pumps of MDR ...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2008.10.028
更新日期：2009-05-01 00:00:00
abstract：:Chemotherapy is a cornerstone of cancer treatment but it can have serious side effects, such as intestinal mucositis. This work reports the susceptibility/resistance profiles of 34 species of lactic acid bacteria (LAB), bifidobacteria and other intestinal bacteria from different collections to various chemotherapeutic...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2016.07.011
更新日期：2016-11-01 00:00:00
abstract：:Due to limited therapeutic options, combination therapy has been used empirically to treat carbapenem-resistant Acinetobacter baumannii (CRAB). Polymyxin-based combinations have been widely studied and used in the clinical setting. However, the use of polymyxins is often limited due to nephrotoxicity and neurotoxicity...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2020.106115
更新日期：2020-10-01 00:00:00
abstract：:The chequerboard technique was used to look for synergistic combinations of ceftazidime, imipenem and pefloxacin. The synergistic combinations were used in vivo in mice experimentally infected with Escherichia coli, Salmonella typhimurium and Pseudomonas aeruginosa. In vitro ceftazidime/imipenem, ceftazidime/pefloxaci...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/s0924-8579(03)00127-4
更新日期：2003-12-01 00:00:00
abstract：:The ability of antibiotics used in bronchopulmonary infections in cystic fibrosis (CF) patients to prevent Pseudomonas aeruginosa early biofilm formation was studied using a biofilm microtitre assay with 57 non-mucoid P. aeruginosa isolates (44 first colonisers and 13 recovered during the initial intermittent colonisa...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2012.04.006
更新日期：2012-08-01 00:00:00
abstract：:Over the past decade, non-fermenting Gram-negative bacteria have emerged as important opportunistic pathogens in the increasing population of patients who are immunocompromised by their disease or medical treatment. These bacteria are assisted by their ubiquitous distribution in the environment and have a propensity f...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章,评审
doi：10.1016/S0924-8579(07)72176-3
更新日期：2007-05-01 00:00:00
abstract：:Seven new sites leading to increased beta-lactam susceptibility were identified and mapped in Staphylococcus aureus by Tn551 or Tn917 mediated insertional inactivation. Their effect was more pronounced in methicillin resistant than in susceptible strains. Except for inserts each in SmaI-K and SmaI-B, all were located ...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/s0924-8579(96)00346-9
更新日期：1997-02-01 00:00:00
abstract：:This study investigated the correlation between fluoroquinolone (ciprofloxacin or levofloxacin) use and rates of fluoroquinolone resistance in Pseudomonas aeruginosa isolates from patients with nosocomial infection at a medical centre in Taiwan. Antibiotic utilisation data were extracted on a monthly basis from the in...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2009.11.007
更新日期：2010-03-01 00:00:00
abstract：:The aim of this study was to determine the rifampicin (RIF) resistance rate of meticillin-resistant Staphylococcus aureus (MRSA) amongst patients with MRSA bacteraemia who have or have not been exposed to RIF-containing antituberculous (anti-TB) treatment. From 2000 to 2008, patients with MRSA bacteraemia and previous...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2011.01.018
更新日期：2011-06-01 00:00:00
abstract：:Many studies have demonstrated that sub-minimum inhibitory concentrations (sub-MICs) of antimicrobial agents can inhibit bacterial biofilm formation. However, the mechanisms by which antimicrobial agents at sub-MICs inhibit biofilm formation remain unclear. At present, most studies are focused on Gram-negative bacteri...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2012.01.009
更新日期：2012-05-01 00:00:00
abstract：:This study aimed to characterise UTIs caused by Pseudomonas aeruginosa in hospitalised adults and to identify risk factors for infections caused by multidrug-resistant (MDR) strains. A retrospective case-case-control study was conducted in two Italian teaching hospitals. Totally, 242 monomicrobial P. aeruginosa UTIs w...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2020.105900
更新日期：2020-04-01 00:00:00
abstract：:Influenza is a heavy socially significant viral infection that affects humans, birds, and wild and domestic animals. The threat of existing and new highly pathogenic subtypes of influenza A virus (IAV) makes it necessary to develop an effective drug that may affect different IAV strains. For this purpose, oligodeoxynu...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2015.03.004
更新日期：2015-07-01 00:00:00
abstract：:Invasive Streptococcus pneumoniae infections in children are associated with serious consequences in terms of morbidity and mortality. The main objective of the study was to determine if invasive infections caused by penicillin-resistant Streptococcus pneumoniae (PRSP) differed in clinical presentation, outcome, risk ...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/s0924-8579(02)00127-9
更新日期：2002-08-01 00:00:00
abstract：:Candida spp., especially Candida albicans, is one of the main colonisers of the oral cavity. Due to its ability to form biofilms, it can be implicated in dental caries, periodontal disease and denture stomatitis. Microbial cells in biofilms are minimally impacted by conventional drugs. The aim of this study was to fin...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2018.08.020
更新日期：2018-12-01 00:00:00
abstract：:The frequency of occurrence and antimicrobial susceptibility patterns of 18569 non-fermentative Gram-negative bacilli consecutively collected as part of the SENTRY Antimicrobial Surveillance Program were summarized. The isolates were tested by the broth microdilution method in three coordinator laboratories using comm...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/s0924-8579(03)00245-0
更新日期：2003-12-01 00:00:00
abstract：:Linezolid is the first available oxazolidinone, possessing broad-spectrum activity against Gram-positive bacteria and a favourable pharmacokinetic profile. The aim of this study was to compare the efficacy and safety of linezolid with vancomycin, the gold-standard treatment, for meticillin-resistant Staphylococcus aur...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章,meta分析
doi：10.1016/j.ijantimicag.2012.12.012
更新日期：2013-05-01 00:00:00
abstract：:Gram-negative bacterial pathogens are intrinsically resistant to several antibiotics that are not able to penetrate the cell envelope barrier. The aim of this study was to identify peptides that at low concentrations induce susceptibility to these antibiotics in multidrug-resistant (MDR) Gram-negative bacterial strain...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2018.10.025
更新日期：2019-06-01 00:00:00
abstract：BACKGROUND:Overprescribing antibiotics for patients with no bacterial infection is of growing global concern. It is important for timely Antimicrobial Stewardship Program (ASP) intervention to discontinue antibiotics for patients whose symptoms can be explained by non-infective causes, and without availability of bacte...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2019.01.008
更新日期：2019-05-01 00:00:00
abstract：:Staphylococcus aureus is responsible for life-threatening and difficult-to-treat infections worldwide and antimicrobial resistance is an increasing concern. Whilst acquired resistance has been widely studied, little is known of the contributions from chromosomal determinants that upon inactivation may reduce the susce...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2017.08.024
更新日期：2018-01-01 00:00:00
abstract：:A restrictive antibiotic policy banning routine use of ceftriaxone and ciprofloxacin was implemented in a 450-bed district general hospital following an educational campaign. Monthly consumption of nine antibiotics was monitored in defined daily doses (DDDs) per 1000 patient-occupied bed-days (1000 pt-bds) 9 months be...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2012.10.013
更新日期：2013-02-01 00:00:00
abstract：:The epidemiology of invasive fungal infections is currently at a crucial stage. Potentially fatal fungal strains are emerging that are resistant to many commonly used antifungal agents. It is therefore important to recognize and minimize the major risk factors associated with infection. This paper summarizes the key e...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章,评审
doi：10.1016/j.ijantimicag.2006.03.006
更新日期：2006-06-01 00:00:00
abstract：:The mutant prevention concentration (MPC) of fluoroquinolones, linezolid, rifabutin, rifampicin and macrolides was determined in 16 nontuberculous Mycobacterium species in order to compare the incidence of resistant mutant occurrence for different antibiotics. Linezolid showed good activity against Mycobacterium gordo...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2004.03.026
更新日期：2004-10-01 00:00:00
abstract：:The safety of all drugs is established by animal studies, administration to healthy volunteers and the observations during clinical studies to confirm efficacy. During these studies, patients are questioned about side-effects and extensive laboratory testing of blood and urine samples is performed. Despite these exten...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章,评审
doi：10.1016/s0924-8579(01)00399-5
更新日期：2001-01-01 00:00:00
abstract：:Toxin-producing gram-positive bacteria are responsible for emerging and life-threatening infections in humans worldwide. Both rapid toxin detection and adapted therapy are essential to limit the morbidity due to such toxins, especially staphylococcal Panton-Valentine leukocidin (PVL). Here we describe the use of a mas...
journal_title：International journal of antimicrobial agents
pub_type： 杂志文章
doi：10.1016/j.ijantimicag.2009.03.017
更新日期：2009-11-01 00:00:00
