Journal of Microbiology

Research Article

PneusPage: A WEB-BASED TOOL for the analysis of Whole-Genome Sequencing Data of Streptococcus pneumonia: Eunju Hong, Youngjin Shin, Hyunseong Kim, Woo Young Cho, Woo-Hyun Song, Seung-Hyun Jung, Minho Lee; J. Microbiol. 2025;63(1):e.2409020. Published online January 24, 2025; DOI: https://doi.org/10.71150/jm.2409020

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Abstract PDF Supplementary Material: With the advent of whole-genome sequencing, opportunities to investigate the population structure, transmission patterns, antimicrobial resistance profiles, and virulence determinants of Streptococcus pneumoniae at high resolution have been increasingly expanding. Consequently, a user-friendly bioinformatics tool is needed to automate the analysis of Streptococcus pneumoniae whole-genome sequencing data, summarize clinically relevant genomic features, and further guide treatment options. Here, we developed PneusPage, a web-based tool that integrates functions for species prediction, molecular typing, drug resistance determination, and data visualization of Streptococcus pneumoniae. To evaluate the performance of PneusPage, we analyzed 80 pneumococcal genomes with different serotypes from the Global Pneumococcal Sequencing Project and compared the results with those from another platform, PathogenWatch. We observed a high concordance between the two platforms in terms of serotypes (100% concordance rate), multilocus sequence typing (100% concordance rate), penicillin-binding protein typing (88.8% concordance rate), and the Global Pneumococcal Sequencing Clusters (98.8% concordance rate). In addition, PneusPage offers integrated analysis functions for the detection of virulence and mobile genetic elements that are not provided by previous platforms. By automating the analysis pipeline, PneusPage makes whole-genome sequencing data more accessible to non-specialist users, including microbiologists, epidemiologists, and clinicians, thereby enhancing the utility of whole-genome sequencing in both research and clinical settings. PneusPage is available at https://pneuspage.minholee.net/.

Journal Articles

Mammaliicoccus sciuri's Pan-Immune System and the Dynamics of Horizontal Gene Transfer Among Staphylococcaceae: a One-Health CRISPR Tale: Allan de Carvalho, Marcia Giambiagi-deMarval, Ciro César Rossi; J. Microbiol. 2024;62(9):775-784. Published online July 22, 2024; DOI: https://doi.org/10.1007/s12275-024-00156-7

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Abstract: Recently emancipated from the Staphylococcus genus due to genomic differences, Mammaliicoccus sciuri, previously classified as an occasional pathogen, emerges as a significant player in the landscape of resistance gene dissemination among Staphylococcaceae. Despite its classification, its role remained enigmatic. In this study, we delved into the genomic repertoire of M. sciuri to unravel its contribution to resistance and virulence gene transfer in the context of One Health. Through comprehensive analysis of publicly available genomes, we unveiled a diverse pan-immune system adept at defending against exogenous genetic elements, yet concurrently fostering horizontal gene transfer (HGT). Specifically, exploration of CRISPR-Cas systems, with spacer sequences as molecular signatures, elucidated a global dissemination pattern spanning environmental, animal, and human hosts. Notably, we identified the integration of CRISPR-Cas systems within SCCmecs (Staphylococcal Cassette Chromosome mec), harboring key genes associated with pathogenicity and resistance, especially the methicillin resistance gene mecA, suggesting a strategic adaptation to outcompete other mobile genetic elements. Our findings underscored M. sciuri's active engagement in HGT dynamics and evolutionary trajectories within Staphylococcaceae, emphasizing its central role in shaping microbial communities and highlighting the significance of understanding its implications in the One Health framework, an interdisciplinary approach that recognizes the interconnectedness of human, animal, and environmental health to address global health challenges.

Differences in the methanogen community between the nearshore and offshore sediments of the South Yellow Sea: Ye Chen , Yu Zhen , Jili Wan , Siqi Li , Jiayin Liu , Guodong Zhang , Tiezhu Mi; J. Microbiol. 2022;60(8):814-822. Published online July 14, 2022; DOI: https://doi.org/10.1007/s12275-022-2022-2

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Abstract

The differences in methanogen abundance and community composition were investigated between nearshore and offshore sediments in the South Yellow Sea (SYS). Shannon, Simpson, and Chao1 indices revealed a higher diversity of methanogens in the nearshore sediments than in the offshore sediments. The Mann–Whitney U test demonstrated that the relative abundance of Methanococcoides was significantly higher in the offshore sediments, while the relative abundances of Methanogenium, Methanosarcina, Methanosaeta, Methanolinea, and Methanomassiliicoccus were significantly higher in the nearshore sediments (P < 0.05). The abundance of the mcrA gene in the nearshore sediments was significantly higher than that in the offshore sediments. Furthermore, a similar vertical distribution of the methanogen and sulfatereducing bacteria (SRB) abundances was observed in the SYS sediments, implying there is potential cooperation between these two functional microbes in this environment. Finally, total organic carbon (TOC) was significantly correlated with methanogen community composition.

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Methylmercury cycling in the Bohai Sea and Yellow Sea: Reasons for the low system efficiency of methylmercury production
Lufeng Chen, Guoyi Cheng, Zhengwen Zhou, Yong Liang, Zhijia Ci, Yongguang Yin, Guangliang Liu, Yong Cai, Yanbin Li
Water Research.2024; 258: 121792. CrossRef
Diversity, composition, metabolic characteristics, and assembly process of the microbial community in sewer system at the early stage
Yiming Yuan, Guangyi Zhang, Hongyuan Fang, Haifeng Guo, Yongkang Li, Zezhuang Li, Siwei Peng, Fuming Wang
Environmental Science and Pollution Research.2024; 31(9): 13075. CrossRef
Improved Quantitative Real-Time PCR Protocol for Detection and Quantification of Methanogenic Archaea in Stool Samples
Agata Anna Cisek, Iwona Bąk, Bożena Cukrowska
Microorganisms.2023; 11(3): 660. CrossRef

Oecophyllibacter saccharovorans gen. nov. sp. nov., a bacterial symbiont of the weaver ant Oecophylla smaragdina: Kah-Ooi Chua , Wah-Seng See-Too , Jia-Yi Tan , Sze-Looi Song , Hoi-Sen Yong , Wai-Fong Yin , Kok-Gan Chan; J. Microbiol. 2020;58(12):988-997. Published online October 23, 2020; DOI: https://doi.org/10.1007/s12275-020-0325-8

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Abstract

In this study, bacterial strains Ha5T, Ta1, and Jb2 were isolated from different colonies of weaver ant Oecophylla smaragdina. They were identified as bacterial symbionts of the ant belonging to family Acetobacteraceae and were distinguished as different strains based on distinctive random-amplified polymorphic DNA (RAPD) fingerprints. Cells of these bacterial strains were Gram-negative, rod-shaped, aerobic, non-motile, catalase-positive and oxidase-negative. They were able to grow at 15–37°C (optimum, 28–30°C) and in the presence of 0–1.5% (w/v) NaCl (optimum 0%). Their predominant cellular fatty acids were C18:1 ω7c, C16:0, C19:0 ω8c cyclo, C14:0, and C16:0 2-OH. Strains Ha5T, Ta1, and Jb2 shared highest 16S rRNA gene sequence similarity (94.56–94.63%) with Neokomagataea tanensis NBRC106556T of family Acetobacteraceae. Both 16S rRNA gene sequence-based phylogenetic analysis and core gene-based phylogenomic analysis placed them in a distinct lineage in family Acetobacteraceae. These bacterial strains shared higher than species level thresholds in multiple overall genome-relatedness indices which indicated that they belonged to the same species. In addition, they did not belong to any of the current taxa of Acetobacteraceae as they had low pairwise average nucleotide identity (< 71%), in silico DNA-DNA hybridization (< 38%) and average amino acid identity (< 67%) values with all the type members of the family. Based on these results, bacterial strains Ha5T, Ta1, and Jb2 represent a novel species of a novel genus in family Acetobacteraceae, for which we propose the name Oecophyllibacter saccharovorans gen. nov. sp. nov., and strain Ha5T as the type strain.

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Aristophania vespae gen. nov., sp. nov., isolated from wasps, is related to Bombella and Oecophyllibacter, isolated from bees and ants
Juan Guzman, Miyoung Won, Anja Poehlein, Atena Sadat Sombolestani, Daniela Mayorga-Ch, David Laureys, Jessika De Clippeleer, Peter Kämpfer, Rolf Daniel, Andreas Vilcinskas, Peter Vandamme, Soon-Wo Kwon
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
Bacteria can maintain rRNA operons solely on plasmids for hundreds of millions of years
Mizue Anda, Shun Yamanouchi, Salvatore Cosentino, Mitsuo Sakamoto, Moriya Ohkuma, Masako Takashima, Atsushi Toyoda, Wataru Iwasaki
Nature Communications.2023;[Epub] CrossRef
Formicincola oecophyllae gen. nov. sp. nov., a novel member of the family Acetobacteraceae isolated from the weaver ant Oecophylla smaragdina
Kah-Ooi Chua, Yvonne Jing Mei Liew, Wah-Seng See-Too, Jia-Yi Tan, Hoi-Sen Yong, Wai-Fong Yin, Kok-Gan Chan
Antonie van Leeuwenhoek.2022; 115(8): 995. CrossRef
Pharmacological potential of ants and their symbionts – a review
Surbhi Agarwal, Garima Sharma, Kavita Verma, Narayanan Latha, Vartika Mathur
Entomologia Experimentalis et Applicata.2022; 170(12): 1032. CrossRef
Valid publication of new names and new combinations effectively published outside the IJSEM
Aharon Oren, George M. Garrity
International Journal of Systematic and Evolutionary Microbiology .2021;[Epub] CrossRef

Genomic surveillance links livestock production with the emergence and spread of multi-drug resistant non-typhoidal Salmonella in Mexico: Enrique Jesús Delgado-Suárez , Rocío Ortíz-López , Wondwossen A. Gebreyes , Marc W. Allard , Francisco Barona-Gómez , María Salud Rubio-Lozano; J. Microbiol. 2019;57(4):271-280. Published online February 5, 2019; DOI: https://doi.org/10.1007/s12275-019-8421-3

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Abstract

Multi-drug resistant (MDR) non-typhoidal Salmonella (NTS) is increasingly common worldwide. While food animals are thought to contribute to the growing antimicrobial resistance (AMR) problem, limited data is documenting this relationship, especially in low and middle-income countries (LMIC). Herein, we aimed to assess the role of non-clinical NTS of bovine origin as reservoirs of AMR genes of human clinical significance. We evaluated the phenotypic and genotypic AMR profiles in a set of 44 bovine-associated NTS. For comparative purposes, we also included genotypic AMR data of additional isolates from Mexico (n = 1,067) that are publicly available. The most frequent AMR phenotypes in our isolates involved tetracycline (40/44), trimethoprim-sulfamethoxazole (26/44), chloramphenicol (19/44), ampicillin (18/44), streptomycin (16/44), and carbenicillin (13/44), while nearly 70% of the strains were MDR. These phenotypes were correlated with a widespread distribution of AMR genes (i.e. tetA, aadA, dfrA12, dfrA17, sul1, sul2, bla-TEM-1, blaCARB-2) against multiple antibiotic classes, with some of them contributed by plasmids and/or class-1 integrons. We observed different AMR genotypes for betalactams and tetracycline resistance, providing evidence of convergent evolution and adaptive AMR. The probability of MDR genotype occurrence was higher in meat-associated isolates than in those from other sources (odds ratio 11.2, 95% confidence interval 4.5–27.9, P < 0.0001). The study shows that beef cattle are a significant source of MDR NTS in Mexico, highlighting the role of animal production on the emergence and spread of MDR Salmonella in LMIC.

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Geography, Antimicrobial Resistance, and Genomics of Salmonella enterica (Serotypes Newport and Anatum) from Meat in Mexico (2021–2023)
Eduardo Canek Reynoso, Enrique Jesús Delgado-Suárez, Cindy Fabiola Hernández-Pérez, Yaselda Chavarin-Pineda, Elizabeth Ernestina Godoy-Lozano, Geny Fierros-Zárate, Omar Alejandro Aguilar-Vera, Santiago Castillo-Ramírez, Luz del Carmen Sierra Gómez-Pedroso
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Genomic analysis of the MLST population structure and antimicrobial resistance genes associated with Salmonella enterica in Mexico
Adrián Gómez-Baltazar, Angélica Godínez-Oviedo, Gerardo Vázquez-Marrufo, Ma. Soledad Vázquez-Garcidueñas, Montserrat Hernández-Iturriaga
Genome.2023; 66(12): 319. CrossRef
Comparative Genomic Analysis Discloses Differential Distribution of Antibiotic Resistance Determinants between Worldwide Strains of the Emergent ST213 Genotype of Salmonella Typhimurium
Elda Araceli Hernández-Díaz, Ma. Soledad Vázquez-Garcidueñas, Andrea Monserrat Negrete-Paz, Gerardo Vázquez-Marrufo
Antibiotics.2022; 11(7): 925. CrossRef
Genomic surveillance of antimicrobial resistance shows cattle and poultry are a moderate source of multi-drug resistant non-typhoidal Salmonella in Mexico
Enrique Jesús Delgado-Suárez, Tania Palós-Guitérrez, Francisco Alejandro Ruíz-López, Cindy Fabiola Hernández Pérez, Nayarit Emérita Ballesteros-Nova, Orbelín Soberanis-Ramos, Rubén Danilo Méndez-Medina, Marc W. Allard, María Salud Rubio-Lozano, Iddya Karu
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Class 1 integron-borne cassettes harboring blaCARB-2 gene in multidrug-resistant and virulent Salmonella Typhimurium ST19 strains recovered from clinical human stool samples, United States
Daniel F. M. Monte, Fábio P. Sellera, Ralf Lopes, Shivaramu Keelara, Mariza Landgraf, Shermalyn Greene, Paula J. Fedorka-Cray, Siddhartha Thakur, Iddya Karunasagar
PLOS ONE.2020; 15(10): e0240978. CrossRef

Contribution of EmrAB efflux pumps to colistin resistance in Acinetobacter baumannii: Ming-Feng Lin , Yun-You Lin , Chung-Yu Lan; J. Microbiol. 2017;55(2):130-136. Published online January 26, 2017; DOI: https://doi.org/10.1007/s12275-017-6408-5

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Abstract

Efflux pumps play an important role in antimicrobial resistance for Acinetobacter baumannii. However, the function of the Emr pump system and the relationship between Emr and drug resistance has not been characterized in A. baumannii. In this study, four possible groups of emr-like genes were found by searching a genome database. Among them, A1S_ 1772 (emrB) and A1S_1773 (emrA) were demonstrated to be co-transcribed as a single operon. Moreover, during osmotic stress, A1S_1772 showed the largest change in gene expression compared to the other emrB-like genes, and deletion of A1S_1772 (AB ΔemrB) significantly slowed cell growth in 20% sucrose. Using a phenotypic microarray analysis, the AB ΔemrB mutant was more susceptible to colistin and nafcillin, paromomycin, spiramycin, and D,L-serine hydroxmate than the wild type. The spot assay, time kill assay and minimal inhibition concentration determination also indicated that the wild type could tolerate colistin better than the AB ΔemrB mutant. Finally, the increased expression levels of all emrBlike genes, including A1S_0775, A1S_0909, A1S_1772, and A1S_1799, in colistin resistance-induced A. baumannii further supported the possible involvement of the emrB genes in A. baumannii colistin resistance. Together, the Emr pump systems in A. baumannii contribute to adaptation to osmotic stress and resistance to colistin.

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Research Support, Non-U.S. Gov'ts

Antimicrobial Resistance, Virulence Genes and PFGE-profiling of Escherichia coli Isolates from South Korean Cattle Farms: Seung Won Shin , Jae-Won Byun , Myounghwan Jung , Min-Kyoung Shin , Han Sang Yoo; J. Microbiol. 2014;52(9):785-793. Published online July 30, 2014; DOI: https://doi.org/10.1007/s12275-014-4166-1

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Abstract

To estimate the prevalence of Escherichia coli with potential pathogenicity in cattle farm in South Korea, a total of 290 E. coli isolates were isolated from cattle farms over a period of 2 years in South Korea. These were examined for phenotypic and genotypic characteristics including antimicrobial susceptibility, serotype, and gene profiles of virulence and antimicrobial resistance. The most dominant virulence gene was f17 (26.2%), followed by stx2 (15.9%), ehxA (11.0%), stx1 (8.3%), eae (5.2%), and sta (4.1%). Some shiga-toxin producing E. coli isolates possessed eae (15.9%). All isolates except for one showed resistance to one or more antimicrobials, with 152 isolates exhibiting multidrug-resistance. The most prevalent resistance phenotype detected was streptomycin (63.1%), followed by tetracycline (54.5%), neomycin (40.3%), cephalothin (32.8%), amoxicillin (30.0%), ampicillin (29.7%), and sulphamethoxazole/trimethoprim (16.6%). The associated resistance determinants detected were strAstrB (39.0%), tet(E) (80.0%), tet(A) (27.6%), aac(3)-IV (33.1%), aphA1 (21.4%), blaTEM (23.8%), and sul2 (22.1%). When investigated by O serotyping and PFGE molecular subtyping, the high degree of diversity was exhibited in E. coli isolates. These results suggest that E. coli isolates from South Korean cattle farms are significantly diverse in terms of virulence and antimicrobial resistance. In conclusion, the gastroinstestinal flora of cattle could be a significant reservoir of diverse virulence and antimicrobial resistance determinants, which is potentially hazardous to public health.

Citations

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O-serogroups, virulence genes, antimicrobial susceptibility, and MLST genotypes of Shiga toxin-producing Escherichia coli from swine and cattle in Central China
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Virulence Determinants in Vancomycin-Resistant Enterococcus faecium vanA Isolated from Different Sources at University Hospital of Londrina, Paraná, Brazil: Flávia Imanishi Ruzon , Suelen Balero de Paula , Renata Lumi Kanoshiki , Jussevania Pereira-Santos , Gilselena Kerbauy , Renata Katsuko Takayama Kobayashi , Lucy Megumi Yamauchi , Márcia Regina Eches Perugini , Sueli Fumie Yamada-Ogatta; J. Microbiol. 2010;48(6):814-821. Published online January 9, 2011; DOI: https://doi.org/10.1007/s12275-010-0099-5

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Abstract: Enterococcus faecium, especially those showing multidrug resistance, has emerged as a significant cause of healthcare-associated infections worldwide. However, relatively little is known about the virulence and pathogenesis of this species. The aim of this study was to determine the occurrence of four putative virulence determinants of E. faecium and to correlate them with phenotypic traits. Using forty E. faecium vanA-type isolates from hospitalized patients and their environmental vicinity, we determined the following: the antimicrobial susceptibility profile, occurrence of the genes cylA, efaA, esp, and gelE, hemolytic and gelatinase activities, capacity to form biofilm and in vitro adhesion to epithelial cells. All isolates were shown to be resistant to vancomycin and teicoplanin, as well as to two or more other antimicrobials. All isolates harbored at least one putative virulence marker, and the prevalence was as follows: esp, 87.5%; efaA, 82.5%; gelE, 70%; and cylA, 65%. The presence of 4 genes was observed in 32.5% isolates. The presence of the efaA was associated with the presence of esp, regardless of the source of the isolates. A positive association with the presence of cylA and hemolytic activity in the sheep blood agar assay was observed. No association was found for gelE and gelatinase production in the agar plate assay, for efaA and LLC-MK2 cell adhesion, and for esp and biofilm formation on polystyrene surface. These results show the presence of putative virulence genes in multiple antimicrobial resistant E. faecium isolates from different sources in a hospital setting.

Journal Article

Antimicrobial Resistance Patterns and Characterization of Integrons of Shigella sonnei Isolates in Seoul, 1999-2008: Young-hee Jin , Young-hee Oh , Ji-hun Jung , Soo-jin Kim , Jin-ah Kim , Ki-young Han , Min-young Kim , Seog-gee Park , Young-ki Lee; J. Microbiol. 2010;48(2):236-242. Published online May 1, 2010; DOI: https://doi.org/10.1007/s12275-010-9220-z

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Abstract: A total of 66 Shigella sonnei isolates from 1999 to 2008 in Seoul was analyzed for their antimicrobial resistance, carriage of integron, and the patterns of Pulsed-field gel electrophoresis (PFGE). A high level of antimicrobial resistance to streptomycin (100%), trimethoprim/sulfamethoxazole (95%), tetracycline (94%), nalidixic acid (65%), and ampicillin (41%) was observed among S. sonnei isolates. Fourteen profiles of antimicrobial resistance were identified with the most common resistance profile being nalidixic acid, streptomycin, tetracycline, and trimethoprim/sulfamethoxazole (35%). PCR and DNA sequencing analysis revealed the presence of class 2 integron in all isolates, and class 1 and 2 integrons in 7 isolates. The class 2 integron carried two types of gene cassettes. One cassette array was dfrI, sat2, and aadA1 (91%), and the other was dfr1 and sat1 (8%). dfrA12 and aadA2 gene cassette was found in one isolate containing class 1 integron. PFGE was carried out to examine the genetic relatedness among isolates. All isolates except for one showed similar PFGE patterns (similarity of 80.1%). These results suggest that the S. sonnei isolated during 1999-2008 in Seoul have similar lineages that have not undergone evolutionary changes with time.

Research Support, Non-U.S. Gov'ts

Isolation of Multidrug-Resistant Salmonella typhimurium DT104 from Swine in Korea: Ki Eun Lee , Yeonhee Lee; J. Microbiol. 2007;45(6):590-592.; DOI: https://doi.org/2603 [pii]

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Abstract: We report the isolation of Salmonella enterica serotype Typhimurium phage type DT104 (CCARM 8104) from swine in Korea. The CCARM 8104 isolate was resistant to nalidixic acid and showed reduced susceptibility to quinolones. The CCARM 8104 isolate had a missense mutation, Asp87Asn, in the quinolone resistance-determining region in gyrA and produced PSE-1. The CCARM 8104 isolate carried two different class 1 integrons, and the PSE-1 β-lactamase gene was inserted into a 1,200 bp class 1 integron. The presence of DT104 with pse-1 in an integron located in a plasmid and reduced susceptibility to quinolone in swine pose a significant threat of possible horizontal spread between swine and humans.

Molecular Characterization of Pseudomonas aeruginosa Isolates Resistant to All Antimicrobial Agents, but Susceptible to Colistin, in Daegu, Korea: Yoo Chul Lee , Byung Jun Ahn , Jong Sook Jin , Jung Uk Kim , Sang Hwa Lee , Do Young Song , Won Kil Lee , Je Chul Lee; J. Microbiol. 2007;45(4):358-363.; DOI: https://doi.org/2560 [pii]

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Abstract: Multi-drug resistant Pseudomonas aeruginosa has been implicated in a variety of serious therapeutic problems in clinical environments. Among the 968 P. aeruginosa isolates obtained from two hospitals in Daegu, Korea, we acquired 17 isolates that were resistant to all available tested antimicrobial agents, with the exception of colistin (colistin-only sensitive). We characterized the antimicrobial susceptibilities, metallo-β-lactamases, and epidemiological relatedness among the colistin-only sensitive P. aeruginosa isolates. All colistin-only sensitive isolates were positive in the modified Hodge test and imipenem-EDTA synergy test, thereby indicating the production of metallo-β-lactamases. 11 isolates from the secondary hospital and six isolates from the tertiary teaching hospital harbored blaVIM-2 and blaIMP-1, respectively. The pulsed-field gel electrophoretic analysis of the SpeI-digested DNA from P. aeruginosa isolates indicated that two different clones of colistin-only sensitive P. aeruginosa originated from each hospital, and had spread within the hospital environment. Overall, colistin-only sensitive P. aeruginosa was detected in Korea for the first time, but no pan-drug resistant bacteria were identified. Nationwide surveillance is required in order to monitor the emergence of colistin-only sensitive or pan-drug resistant bacteria.

Isolation of Quinolone-Resistant Escherichia coli Found in Major Rivers in Korea: Dahye Jung , Min Young Lee , Jung Min Kim , Je Chul Lee , Dong Taek Cho , Yeonhee Lee; J. Microbiol. 2006;44(6):680-684.; DOI: https://doi.org/2456 [pii]

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Abstract: Twenty isolates resistant to seven quinolones were isolated from major rivers in Korea. All isolates had three mutations, Ser83→Leu and Asp87→Asn in GyrA and Ser80→Ile or Ser80→Arg in ParC and three isolates had an additional mutation Glu84→Gly or Glu84→Val in ParC. In addition, a clonal spread was not found in these isolates.

Journal Article

Antimicrobial Susceptibility and Clonal Relatedness between Community- and Hospital-Acquired Methicillin-Resistant Staphylococcus aureus from Blood Cultures: Sook-In Jung , Dong Hyeon Shin , Kyeong Hwa Park , Jong Hee Shin; J. Microbiol. 2006;44(3):336-343.; DOI: https://doi.org/2378 [pii]

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Abstract: We compared the antimicrobial resistance and clonal relationships among the communityacquired (CA) and hospital-acquired (HA) methicillin-resistant Staphylococcus aureus (MRSA) strains that were isolated from blood cultures in a university hospital over a 4-year period. A total of 131 MRSA isolates, including 28 CA-MRSA and 103 HA-MRSA strains, were identified; antimicrobial susceptibility testing indicated that the CA-MRSA isolates were more susceptible to erythromycin (21% vs 6%; P=0.02), clindamycin (46% vs 12%; P<0.01), ciprofloxacin (43% vs 11%; P<0.01), and gentamicin (43% vs 6%; P<0.01) than were the HA-MRSA isolates. Pulsed-field gel electrophoresis (PFGE) typing and antimicrobial resistance profiles separated the 20 CA-MRSA isolates into 14 and 10 different patterns, respectively, and the 53 HA-MRSA isolates were separated into 24 and 7 different patterns, respectively. Twenty-one (40%) of the 53 HA-MRSA isolates belonged to two predominant PFGE types, and most of them showed multi-drug resistant patterns. Four (20%) of the 20 CA-MRSA and 10 (19%) of the 53 HA-MRSA isolates fell into two common PFGE patterns, and each of them showed the same multi-drug resistant pattern. This study suggests that, although the CA-MRSA blood isolates showed diverse PFGE and antimicrobial resistance patterns, some of these isolates may have originated from the HA-MRSA strains.

Research Support, Non-U.S. Gov't

Isolation of Quinupristin/Dalfopristin-Resistant Streptococcus agalactiae from Asymptomatic Korean Women: Hye Ran Nam , Hak Mee Lee , Yeonhee Lee; J. Microbiol. 2008;46(1):108-111.; DOI: https://doi.org/10.1007/s12275-007-0217-1

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1 Scopus

Abstract: Seven Streptococcus agalactiae isolates were obtained from the vagina of 80 asymptomatic women. Three of these isolates showed multi-drug resistant (MDR) phenotypes: two isolates were resistant to clarithromycin, clindamycin, erythromycin, and tetracycline; and one isolate was resistant to clarithromycin, clindamycin, erythromycin, tetracycline, and quinupristin/dalfopristin. There was no clonal relationship among the MDR isolates. This is the first report of quinupristin/dalfopristin-resistant S. agalactiae.

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