To determine antibiotic susceptibility in isolates of Streptococcus pneumoniae and Haemophilus influenzae collected in 2014-16 from Russia.MICs were determined by CLSI broth microdilution and susceptibility was assessed using CLSI, EUCAST and pharmacokinetic/pharmacodynamic (PK/PD) breakpoints.A total of 279 S. pneumoniae and 279 H. influenzae were collected. Overall, 67.0% of S. pneumoniae were penicillin susceptible by CLSI oral/EUCAST and 93.2% by CLSI intravenous (iv) breakpoints. All were fluoroquinolone susceptible, with amoxicillin, amoxicillin/clavulanic acid and ceftriaxone susceptibility ≥92.8% by CLSI and PK/PD breakpoints. Isolates showed lower susceptibility to cefuroxime, cefaclor, macrolides and trimethoprim/sulfamethoxazole by CLSI criteria: 85.0%, 76.7%, 68.8% and 67.7%, respectively. Generally, susceptibility was slightly lower by EUCAST criteria, except for cefaclor, for which the difference in susceptibility was much greater. Penicillin-resistant isolates had low susceptibility (≤60%) to all agents except fluoroquinolones. All 279 H. influenzae were ceftriaxone susceptible, 15.4% were β-lactamase positive and ≥97.5% were amoxicillin/clavulanic acid susceptible (CLSI, EUCAST and PK/PD breakpoints). Four isolates were fluoroquinolone non-susceptible by current EUCAST criteria. A major discrepancy was found with azithromycin susceptibility between CLSI (99.3%) and EUCAST and PK/PD (2.2%) breakpoints. Trimethoprim/sulfamethoxazole was poorly active (62.7% susceptible).Susceptibility to penicillin (oral), macrolides and trimethoprim/sulfamethoxazole was low in S. pneumoniae from Russia. However, isolates were fully susceptible to fluoroquinolones and ≥92.8% were susceptible to amoxicillin, amoxicillin/clavulanic acid and ceftriaxone. Isolates of H. influenzae only showed reduced susceptibility to ampicillin, cefaclor, clarithromycin and trimethoprim/sulfamethoxazole. Some differences were detected between CLSI, EUCAST and PK/PD breakpoints, especially with cefaclor, cefuroxime and macrolides. These data suggest further efforts are required to harmonize international breakpoints.
Objective. To assess the prevalence and antimicrobial susceptibility of carbapenemase-producing Enterobacterales (CPE). Materials and Methods. A total of 5539 Enterobacterales isolates recovered from hospitalized patients in 52 medical institutions in 27 cities in Russia in 2014-2016 were tested. Antibiotic susceptibility testing (AST) was performed using broth microdilution method according to ISO 20776-1:2006. Avibactam was tested in combinations with beta-lactams at fixed concentration of 4 mg/l. AST results were interpreted according to EUCAST v8.
ObjectivesTo characterize the naturally occurring β-lactamase gene identified from a clinical isolate belonging to a novel enterobacterial species that is closely related to Rahnella spp. and Ewingella spp.
A high level of resistance to carbapenems in Acinetobacter baumannii strains severely limits therapeutic possibilities. Colistin is the last resort drug against such strains, although the cases of resistance to this drug have become more frequent. This article presents the epidemiological features and genetic diversity of colistin nonsusceptible A. baumannii strains collected as part of a national multicenter epidemiological study of the antibiotic resistance of pathogens of nosocomial infections (MARATHON), which was conducted in 2013-2014 in Russia. A total of 527 A. baumannii isolates were collected, 10 (1.9%) of which were nonsusceptible to colistin. The majority of nonsusceptible A. baumannii isolates to colistin showed resistance to carbapenems and had the genes of the acquired OXA-40-like carbapenemases (n = 6). In one case, a combination of OXA-23-like + OXA-40-like (n = 1) genes was identified. One strain had the multidrug-resistant (MDR) phenotype, 6 isolates had extensively drug-resistant (XDR) phenotype, and 3 isolates had pandrug-resistant (PDR) phenotype. Among the colistin nonsusceptible A. baumannii isolates, 6 individual genotypes were identified, most of which belonged to successful international clones (CC92OXF/CC2PAS, n = 4; CC944OXF/ST78PAS, n = 4; CC109OXF/CC1PAS, n = 1).
To study in vitro activity of antimicrobials against clinical isolates from patients with community-acquired urinary tract infections (UTIs) in different regions of Russia, Belarus and Kazakhstan in 2017-2018.A total of 1260 isolates collectedin the Russian Federation, Belarus and Kazakhstanas a part of the international multicenter prospective epidemiological study of the dynamics of antimicrobial resistance of uropathogens causing community-acquired urinary tract infections in different subsets of patients ("DARMIS-2018") were included in the analysis. 1124 strains represented the Enterobacterales order. Uropathogenswere isolated from children and adults of both sexes of all age groups with acute (and recurrences of chronic) community-acquired UTIs including pregnant women with asymptomatic bacteriuriain 34 centers of 26 cities of Russia, Kazakhstan and Belarus in 2017-2018.Enterobacterales jointly comprised a total of 89,2% of all isolated bacterial pathogens (88,9% in the adult subset; 89,3% in the subset of pregnant women and 91,4% in the subset of children and adolescents under 18). The most prevalent species were Escherichia coli (69,4% in the adult subset; 73,6% in the subset of pregnant women and 77,1% in the subset of children and adolescents under 18) and Klebsiella pneumoniae (11,5% in the subset of adults; 10,4% in the subset of pregnant women and 7,1% in the subset of children and adolescents under 18 years of age). The maximum activity against E. coli among oral drugs demonstrated fosfomycin (97,9% in the adult subset; 95,9% in the subset of pregnant women and 99,1% in the subset of children and adolescents under 18) and nitrofurantoin (97,9% in adult subset; 100% in the subset of pregnant women and 96,3% in the subset of children and adolescents under 18). Out of the parenteral drugs meropenem (out of carbapenems) and amikacin showed the highest activity (99,5% and 97,7% in the adult subset; 99,5% and 99,1% in the subset of pregnant women; 100% and 97,2% in the subset of children and adolescents under 18 years of age, respectively). Ampicillin, amoxicillin/clavulanic acid and trimethoprim/sulfamethoxazole demonstrated the lowest in vitro activity against Escherichia coli (less than 80% for everypatient subset). The susceptibility of E. colito ciprofloxacin was 60,4% in the adult subset; 80,0% in the subset of pregnant women and 80,6% in the subset of children and adolescents under 18. The rate of production of extended spectrum beta-lactamases among E. coli isolates based on the results of phenotypic tests was 21,9%.Results of this study indicate the increase of resistance of community-acquired isolates of Enterobacterales and in particular E. coli to the most of antimicrobials in Russia, Belarus and Kazakhstan.
Objective. Objectives. To assess the rates of antibiotic resistance, production of acquired carbapenemases, genotypes and prevalence of «international high-risk clones» among nosocomial strains of Pseudomonas aeruginosa isolated in various regions of Russia within the «MARATHON 2015–2016» study. Materials and Methods. A total of 1006 non-duplicate nosocomial isolates of P. aeruginosa collected in 44 hospitals from 25 cities in Russia in 2015–2016 were studied. Species identification of isolates was performed by means of MALDI-TOF mass-spectrometry.
Surveillance of antimicrobial resistance (AMR) is crucial for identifying trends in resistance and developing strategies for prevention and treatment of infections. Globally, AMR surveillance systems differ in terms of organizational principles, comprehensiveness, accessibility, and usability of data presentation. Until recently, the data on AMR in Russia were scarcely available, especially to international community, despite the fact that the large prospective multicenter surveillance in Russia was conducted and data were accumulated for over 20 years. We describe the source of data, structure, and functionality of a new-generation web platform, called AMRmap ( https://amrmap.net/ ), for analysis of AMR surveillance data in Russia. The developed platform currently comprises susceptibility data of >40,000 clinical isolates, and the data on abundance of key resistance determinants, including acquired carbapenemases in gram-negatives, are updated annually with information on >5,000 new isolates. The AMRmap allows smart data filtration by multiple parameters and provides interactive data analysis and visualization tools: MIC and S/I/R distribution plots, time-trends and regression plots, associated resistance plots, prevalence maps, statistical significance graphs, and tables.
Staphylococcus aureus - one of the most interesting for clinical studies of microbial species with extensive strain diversity, primarily due to the variability of virulence factors and pathogenicity. The aim of this study was approbation of a method for the rapid strain differentiation of S. aureus on the basis of bacterial cell direct protein profiling approach by means of MALDI TOF MS. Beta-lactamase and alpha-hemolysin productions, cording by the blaZ and hla genes, respectively, were selected as markers for the strain differentiation. Mathematical analysis of MALDI mass spectra from 53 isolates allowed the construction of two independent classification models that can differentiate the strains on the presence/absence of blaZ or hla genes. A number of the most significant peaks (masses), which can be considered as markers of the strain differences in S. aureus, were identified using a statistical contribution of each mass peak in the models. These diagnostic models differ the sensitivity and the specificity, which were 97.5% and 82.5% for the classification of strains on the basis of beta-lactamase production, and 90.0% and 88.7% by the presence of alpha-hemolysin.
Additional file 1: Table S1. Characteristics of the isolates from the ST395 dataset. Table S2. Comparison of cgMLST profiles of isolates representing ST395 subclades. Table S3. Location of carbapenemase genes.