Journal of Microbiology

Journal Article

Epidemiological relationships of Campylobacter jejuni strains isolated from humans and chickens in South Korea: Jae-Young Oh , Yong-Kuk Kwon , Bai Wei , Hyung-Kwan Jang , Suk-Kyung Lim , Cheon-Hyeon Kim , Suk-Chan Jung , Min-Su Kang; J. Microbiol. 2017;55(1):13-20. Published online December 30, 2016; DOI: https://doi.org/10.1007/s12275-017-6308-8

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Thirty-nine human isolates of Campylobacter jejuni obtained from a national university hospital during 2007–2010 and 38 chicken isolates of C. jejuni were collected from poultry farms during 2009–2010 in South Korea were used in this study. Campylobacter genomic species and virulence-associated genes were identified by PCR. Pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing (MLST) were performed to compare their genetic relationships. All isolates were highly resistant to ciprofloxacin, nalidixic acid, and tetracycline. Of all isolates tested, over 94% contained seven virulence associated genes (flaA, cadF, racR, dnaJ, cdtA, cdtB, and cdtC). All isolates were classified into 39 types by PFGE clustering with 90% similarity. Some chicken isolates were incorporated into some PFGE types of human isolates. MLST analysis for the 39 human isolates and 38 chicken isolates
result
ed in 14 and 23 sequence types (STs), respectively, of which 10 STs were new. STs overlapped in both chicken and human isolates included ST-21, ST-48, ST-50, ST-51, and ST-354, of which ST-21 was the predominant ST in both human and chicken isolates. Through combined analysis of PFGE types and STs, three chicken isolates were clonally related to the three human isolates associated with food poisoning (VII-ST-48, XXII-ST-354, and XXVIII-ST-51). They were derived from geographically same or distinct districts. Remarkably, clonal spread of food poisoning pathogens between animals and humans was confirmed by population genetic analysis. Consequently, contamination of campylobacters with quinolone resistance and potential virulence genes in poultry production and consumption may increase the risk of infections in humans.

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

Clonal Spread of Carbapenem Resistant Acinetobacter baumannii ST92 in a Chinese Hospital during a 6-Year Period: Lei Huang , Liying Sun , Yan Yan; J. Microbiol. 2013;51(1):113-117. Published online March 2, 2013; DOI: https://doi.org/10.1007/s12275-013-2341-4

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Abstract: The carbapenem resistance rate of Acinetobacter baumannii in our hospital has increased steadily since 2004. The molecular epidemiology of carbapenem resistant A. baumannii (CRAB) clinical isolates was characterized by multilocus sequence typing (MLST) and rep-PCR in parallel, with pandrug susceptible A. baumannii (PSAB) used as control. MLST was performed to determine the sequence types (STs), and eBURST algorithm was used to analyze their relatedness. Carbapenem resistance related genes (oxa-23, oxa-24, oxa-51, oxa-58, imp, vim, and adeB) were screened using Polymerase Chain Reaction (PCR) method. 23 STs were identified in the 65 included isolates, with ST92 being the predominant clone. PSAB clustered into more singletons than CRAB. The positivity of oxa-23 and adeB correlated with high level carbapenem resistance (MICIPM>32 mg/L, MICMEM>32 mg/L) of CRAB ST92 isolates in 2009, which was different from the resistance pattern (MICIPM≤4 mg/L, 8 mg/L ≤MICMEM≤16 mg/L) of CRAB ST92 isolates in 2004. These observations suggest that clonal spread of CRAB ST92 isolates longitudinally is the possible reason for carbapenem resistance rate increase and correlate with high level carbapenem resistance in our hospital.

Molecular Serotyping of Salmonella enterica by Complete rpoB Gene Sequencing: Won-Jin Seong , Hyuk-Joon Kwon , Tae-Eun Kim , Deog-Yong Lee , Mi-Sun Park , Jae-Hong Kim; J. Microbiol. 2012;50(6):962-969. Published online December 30, 2012; DOI: https://doi.org/10.1007/s12275-012-2547-x

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Abstract: Serotyping has been the gold standard for identifying Salmonella, but it requires large amounts of standard antisera. Multilocus sequence typing (MLST) has been applied to identify Salmonella serovars, but the recombination of 4–7 housekeeping genes and multiple analytic steps diminish its applicability. In the present study, we determined the complete sequences of the RNA polymerase beta subunit gene (rpoB) and 7 housekeeping genes (aroC, dnaN, hemD, hisD, purE, sucA, and thrA) for 76 strains of 33 Salmonella enterica serovars and conducted phylogenetic analyses together with the corresponding gene sequences of 24 reference strains registered in the GenBank database. Based on the phylogenetic analyses, 100 strains from 40 serovars and 91 strains from 37 serovars were classified into 60 rpoB (RST) and 49 multilocus sequence types (ST), respectively. The nucleotide similarities were 98.8–100% and 96.9–100% for the complete rpoB gene and the seven concatenated housekeeping genes, respectively. The strains of 35 and 30 serovars formed serovar-specific branches or clusters in the rpoB and housekeeping gene phylogenetic trees, respectively. Therefore, complete rpoB gene sequencing and phylogenetic analysis may be a useful method for identifying Salmonella serovars that is a simpler, more cost-effective, and less time-consuming alternative or complementary method to MLST and conventional serotyping.

Journal Article

Molecular Characteristics and Resistant Mechanisms of Imipenem-Resistant Acinetobacter baumannii Isolates in Shenyang, China: Jing Ping Zhang , Wan Zhu , Su Fei Tian , Yun Zhuo Chu , Bai Yi Chen; J. Microbiol. 2010;48(5):689-694. Published online November 3, 2010; DOI: https://doi.org/10.1007/s12275-010-0137-3

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Abstract: The investigation was carried out to elucidate the molecular characteristics and resistant mechanisms of imipenem-resistant Acinetobacter baumannii. Thirty-seven isolates were collected from January 2007 to December 2007. The homology of the isolates was analyzed by both pulsed field gel electrophoresis (PFGE) and multilocus sequence typing (MLST). The genes of β-lactamases, adeB, and class 1 integron were polymerase chain reaction amplified. Genotype analysis of the 37 A. baumannii isolates by PFGE revealed the circulation of four PFGE types (A-D) ; the A- and B-type accounted for 48.6% and 40.5%, respectively. MLST showed the existence of three allelic profiles. The agar dilution method was carried out to determine the MIC of imipenem, in the absence or presence of carbonyl cyanide m-chlorophenylhydrazone (CCCP, 10 μg/ml). The MICs of the strains to imipenem were between 16 μg/ml and 128 μg/ml. When CCCP was added, a MIC decrease of at least four-fold was observed in 20 isolates, which belonged to the A- or C-type. AdeB and blaPER-1 genes were each detected in 35 isolates, blaOXA-23 gene in 34 isolates and blaOXA-58-like gene in 24 isolates. All isolates harbored blaOXA-51-like genes. No isolates carried the blaIMP-1 gene. Integron was detected in 25 isolates, which mediated the resistance to aminoglycosides and rifampin. The epidemiologic data suggested that the increasing infection of A. baumannii in our hospital was mainly caused by the inter-hospital spread of two epidemic clones. The AdeABC efflux system may be the important factor that leads to the high level of imipenem-resistance in PFGE A-type.

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

A Comparison of Adult and Pediatric Methicillin-Resistant Staphylococcus aureus Isolates Collected from Patients at a University Hospital in Korea: Jin Yeol Park , Jong Sook Jin , Hee Young Kang , Eun Hee Jeong , Je Chul Lee , Yoo Chul Lee , Sung Yong Seol , Dong Taek Cho , Jungmin Kim; J. Microbiol. 2007;45(5):447-452.; DOI: https://doi.org/2591 [pii]

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Abstract: In this study, we compared the phenotypic and genotypic characteristics of 138 MRSA isolates obtained from adult and pediatric patients (adult, 50; children, 88). The resistance rates against gentamicin, clindamycin, and ciprofloxacin were much higher in the adult MRSA isolates than in the pediatric MRSA isolates. The ermC gene, which is responsible for inducible clindamycin resistance, was detected in 52(59.1%) of the 88 pediatric MRSA isolates but in only 5(10.0%) of the 50 adult MRSA isolates. MRSA isolates of clonal type ST5 with an integration of SCCmec type II/II variants was the most predominant clone among the adult isolates, while clonal type ST72 with an integration of SCCmec IV/IVA was the most predominant clone among the pediatric MRSA isolates. Staphylococcal enterotoxin A and toxic shock syndrome toxin-1 were prevalent among the adult MRSA isolates but not among the pediatric MRSA isolates. The results of this study demonstrated remarkable differences between adult and pediatric MRSA isolates in terms of their antimicrobial susceptibility profiles, SCCmec type, multilocus sequence type, staphylococcal toxin genes, and erythromycin resistance genes.

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