Longitudinal surveillance and combination antimicrobial susceptibility testing of multidrug-resistant achromobacter spp. from cystic fibrosis patients.

Conclusions: This study enriches the understanding of MDR Achromobacter spp. epidemiology, confirms prevalence and chronic colonization of A. xylosoxidans in CF lungs. It presents in vitro data to support the efficacy of new combinations for use in the treatment of chronic Achromobacter infections. PMID: 32816722 [PubMed - as supplied by publisher]
Source: Antimicrobial Agents and Chemotherapy - Category: Microbiology Authors: Tags: Antimicrob Agents Chemother Source Type: research

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In this study, the in vitro activities of various ceragenins against Achromobacter-species biofilms were investigated comparatively with a conventional antibiotic (meropenem). Biofilm-formation inhibition and biofilm-adhesion inhibition were investigated on five strong biofilm-producing strains. The lowest MIC50 result was obtained with CSA-13. All of the tested CSAs showed significant biofilm inhibitory activity in the manner of a time- and concentration-dependent effect. To the best of our knowledge, this is the first article to evaluate the antibacterial and antibiofilm activities of tested CSAs against Achromobact...
Source: Journal of Chemotherapy - Category: Cancer & Oncology Tags: J Chemother Source Type: research
Abstract Achromobacter is a genus of non-fermenting Gram negative bacteria under order Burkholderiales Although primarily isolated from respiratory tract of people with cystic fibrosis, Achromobacter spp. can cause a broad range of infections in hosts with other underlying conditions. Their rare occurrence and ever-changing taxonomy hinder defining their clinical features, risk factors for acquisition and adverse outcomes, and optimal treatment. Achromobacter spp. are intrinsically resistant to several antibiotics (e.g. most cephalosporins, aztreonam and aminoglycosides), and are increasingly acquiring resistance ...
Source: Antimicrobial Agents and Chemotherapy - Category: Microbiology Authors: Tags: Antimicrob Agents Chemother Source Type: research
ia AM Abstract Pseudomonas aeruginosa exploits intrinsic and acquired resistance mechanisms to resist almost every antibiotic used in chemotherapy. Antimicrobial resistance in P. aeruginosa isolated from cystic fibrosis (CF) patients is further enhanced by the occurrence of hypermutator strains, a hallmark of chronic CF infections. However, the within-patient genetic diversity of P. aeruginosa populations related to antibiotic resistance remains unexplored. Here, we show the evolution of the mutational resistome profile of a P. aeruginosa hypermutator lineage by performing longitudinal and transversal analyses of ...
Source: Antimicrobial Agents and Chemotherapy - Category: Microbiology Authors: Tags: Antimicrob Agents Chemother Source Type: research
slash;iby N Abstract Background: Pulmonary infection with the multidrug-resistant Mycobacterium abscessus complex (MABSC) is difficult to treat in individuals with cystic fibrosis (CF). MABSC grows as biofilm aggregates in CF lungs, which is known to have anaerobic niches. How aggregation and anoxic conditions affect antibiotic tolerance is not well understood.Objectives: We sought to determine whether disaggregation and oxygen availability sensitizes MABSC isolates to recommended antibiotics.Methods: We tested susceptibility of the following antibiotics amikacin, azithromycin, cefoxitin, ciprofloxacin, clarithrom...
Source: Antimicrobial Agents and Chemotherapy - Category: Microbiology Authors: Tags: Antimicrob Agents Chemother Source Type: research
Abstract Bacteria have acquired multiple mechanisms to evade the lethal effects of current therapeutics, hindering treatment of bacterial infections such as the pathogen P. aeruginosa, which is responsible for nosocomial and cystic fibrosis lung infections. One resistance mechanism involves membrane-embedded multidrug efflux pumps that can effectively extrude an array of substrates, including common antibiotics, dyes, and biocides. Among these is the small multidrug resistant (SMR) efflux protein, consisting of four transmembrane helices (TMs), that functions as an antiparallel dimer. TMs 1-3 comprise the substrat...
Source: Antimicrobial Agents and Chemotherapy - Category: Microbiology Authors: Tags: Antimicrob Agents Chemother Source Type: research
Abstract Pseudomonas aeruginosa is a Gram-negative opportunistic bacterial pathogen that can cause chronic lung infections in patients with cystic fibrosis (CF). The current preferred treatment for CF lung infections includes inhaled tobramycin (TOB); however, studies suggest TOB cannot effectively inhibit biofilm formation. Using a NIH small compounds drug library approved for safe use in humans, we identified rifaximin (RFX), a semisynthetic, rifamycin family, non-systemic antibiotic that inhibits alginate production and growth in P. aeruginosa Inhibition of alginate production was further analyzed using the uro...
Source: Antimicrobial Agents and Chemotherapy - Category: Microbiology Authors: Tags: Antimicrob Agents Chemother Source Type: research
This study aimed to determine the prevalence of hypermutable P. aeruginosa isolates from adult patients with CF from a healthcare institution in Australia, and to characterize the genetic diversity and antibiotic susceptibility of these isolates. A total of 59 P. aeruginosa clinical isolates from patients with CF were characterized. For all isolates, rifampicin mutation frequencies and susceptibility to a range of antibiotics were determined. Of the 59 isolates, 13 (22%) were hypermutable. Whole genome sequences were determined for all hypermutable isolates. Core genome polymorphisms were used to assess genetic relatedness...
Source: Antimicrobial Agents and Chemotherapy - Category: Microbiology Authors: Tags: Antimicrob Agents Chemother Source Type: research
This study aims to predict the mechanisms of mutation-driven resistance that are selected for when P. aeruginosa is challenged with either ceftazidime or ceftazidime/avibactam. For this purpose, P. aeruginosa PA14 was submitted to experimental evolution in the absence of antibiotics and in the presence of increasing concentrations of ceftazidime or ceftazidime/avibactam for 30 consecutive days. Final populations were analysed by whole-genome sequencing. All evolved populations reached similar levels of ceftazidime resistance. Besides, they were more susceptible to amikacin and produced pyomelanin. A first event in the evol...
Source: Antimicrobial Agents and Chemotherapy - Category: Microbiology Authors: Tags: Antimicrob Agents Chemother Source Type: research
Abstract Surfing motility is a novel form of surface adaptation exhibited by the nosocomial pathogen, Pseudomonas aeruginosa, in the presence of the glycoprotein mucin that is found in high abundance at mucosal surfaces especially the lungs of cystic fibrosis and bronchiectasis patients. Here we investigated the adaptive antibiotic resistance of P. aeruginosa under conditions in which surfing occurs compared to cells undergoing swimming. P. aeruginosa surfing cells were significantly more resistant to several classes of antibiotics including aminoglycosides, carbapenems, polymyxins, and fluroquinolones. This was c...
Source: Antimicrobial Agents and Chemotherapy - Category: Microbiology Authors: Tags: Antimicrob Agents Chemother Source Type: research
Abstract The alarming diffusion of multidrug resistant (MDR) bacterial strains requires investigations on non-antibiotic therapies. Amongst them, the use of bacteriophages (phages) as antimicrobial agents, namely phage therapy, is a promising treatment strategy with support by recent successful compassionate treatments in Europe and the U.S.A. In this work, we combined host range and genomic information to design a 6-phage cocktail killing several clinical strains of P. aeruginosa, including those collected from Italian cystic fibrosis (CF) patients, and analyzed the cocktail performance. We demonstrated that the ...
Source: Antimicrobial Agents and Chemotherapy - Category: Microbiology Authors: Tags: Antimicrob Agents Chemother Source Type: research
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