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      Elizabethkingia bruuniana Infections in Humans, Taiwan, 2005–2017

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          Abstract

          Using 16S rRNA and rpoB gene sequencing, we identified 6 patients infected with Elizabethkingia bruuniana treated at E-Da Hospital (Kaohsiung, Taiwan) during 2005–2017. We describe patient characteristics and the molecular characteristics of the E. bruuniana isolates, including their MICs. Larger-scale studies are needed for more robust characterization of this pathogen.

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          Elizabethkingia anophelis bacteremia is associated with clinically significant infections and high mortality

          Unlike Elizabethkingia meningoseptica, the clinical importance of E. anophelis is poorly understood. We determined the clinical and molecular epidemiology of bacteremia caused by Elizabethkingia-like species from five regional hospitals in Hong Kong. Among 45 episodes of Elizabethkingia-like bacteremia, 21 were caused by Elizabethkingia, including 17 E. anophelis, three E. meningoseptica and one E. miricola; while 24 were caused by other diverse genera/species, as determined by 16S rRNA gene sequencing. Of the 17 cases of E. anophelis bacteremia, 15 (88%) were clinically significant. The most common diagnosis was pneumonia (n = 5), followed by catheter-related bacteremia (n = 4), neonatal meningitis (n = 3), nosocomial bacteremia (n = 2) and neutropenic fever (n = 1). E. anophelis bacteremia was commonly associated with complications and carried 23.5% mortality. In contrast, of the 24 episodes of bacteremia due to non-Elizabethkingia species, 16 (67%) were clinically insignificant. Compared to non-Elizabethkingia bacteremia, Elizabethkingia bacteremia was associated with more clinically significant infections (P < 0.01) and positive cultures from other sites (P < 0.01), less polymicrobial bacteremia (P < 0.01), and higher complication (P < 0.05) and mortality (P < 0.05) rates. Elizabethkingia bacteremia is predominantly caused by E. anophelis instead of E. meningoseptica. Elizabethkingia bacteremia, especially due to E. anophelis, carries significant morbidity and mortality, and should be considered clinically significant unless proven otherwise.
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            Evolutionary dynamics and genomic features of the Elizabethkingia anophelis 2015 to 2016 Wisconsin outbreak strain

            An atypically large outbreak of Elizabethkingia anophelis infections occurred in Wisconsin. Here we show that it was caused by a single strain with thirteen characteristic genomic regions. Strikingly, the outbreak isolates show an accelerated evolutionary rate and an atypical mutational spectrum. Six phylogenetic sub-clusters with distinctive temporal and geographic dynamics are revealed, and their last common ancestor existed approximately one year before the first recognized human infection. Unlike other E. anophelis, the outbreak strain had a disrupted DNA repair mutY gene caused by insertion of an integrative and conjugative element. This genomic change probably contributed to the high evolutionary rate of the outbreak strain and may have increased its adaptability, as many mutations in protein-coding genes occurred during the outbreak. This unique discovery of an outbreak caused by a naturally occurring mutator bacterial pathogen provides a dramatic example of the potential impact of pathogen evolutionary dynamics on infectious disease epidemiology.
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              Relative Prevalence and Antimicrobial Susceptibility of Clinical Isolates of Elizabethkingia Species Based on 16S rRNA Gene Sequencing.

              Some of the previously reported clinical isolates of Elizabethkingia meningoseptica may be later named species of Elizabethkingia We determined the accuracy of species identification (with two matrix-assisted laser desorption ionization-time of flight mass spectrometry [MALDI-TOF MS] systems and the Vitek 2 GN card), relative prevalence of three Elizabethkingia spp. in clinical specimens, and antimicrobial susceptibility of the species identified by 16S rRNA gene sequencing. Specimens for culture were collected from patients in a university hospital in Seoul, South Korea, between 2009 and 2015. All 3 Elizabethkingia spp. were detected in patients; among the 86 isolates identified by 16S rRNA gene sequencing, 17 (19.8%) were E. meningoseptica, 18 (20.9%) were Elizabethkingia miricola, and 51 (59.3%) were Elizabethkingia anophelis Only the MALDI-TOF Vitek MS system with an amended database correctly identified all of the isolates. The majority (76.7%) of the isolates were from the lower respiratory tract, and 8 (9.3%) were from blood. Over 90% of E. meningoseptica and E. anophelis isolates were susceptible to piperacillin-tazobactam and rifampin. In contrast, all E. miricola isolates were susceptible to fluoroquinolones except ciprofloxacin. Further studies are urgently needed to determine the optimal antimicrobial agents for the treatment of infections due to each individual Elizabethkingia species.
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                Author and article information

                Journal
                Emerg Infect Dis
                Emerging Infect. Dis
                EID
                Emerging Infectious Diseases
                Centers for Disease Control and Prevention
                1080-6040
                1080-6059
                July 2019
                : 25
                : 7
                : 1412-1414
                Affiliations
                [1]E-Da Hospital, Kaohsiung, Taiwan (J.-N. Lin, C.-H. Lai, Y.-H. Huang);
                [2]I-Shou University, Kaohsiung (J.-N. Lin, C.-H. Lai, Y.-H. Huang);
                [3]Meiho University, Pingtung, Taiwan (C.-H. Yang);
                [4]Taipei Veterans General Hospital, Taipei, Taiwan (H.-H. Lin)
                Author notes
                Address for correspondence: Jiun-Nong Lin, E-Da Hospital, Division of Infectious Diseases, Department of Internal Medicine, No. 1, Yida Road, Jiaosu Village, Yanchao District, Kaohsiung 824, Taiwan; email: jinoli@ 123456kmu.edu.tw
                Article
                18-0768
                10.3201/eid2507.180768
                6590768
                31211685
                e283b152-3e97-48c2-b9a2-dfa877b92af3
                History
                Categories
                Research Letter
                Research Letter
                Elizabethkingia bruuniana Infections in Humans, Taiwan, 2005–2017

                Infectious disease & Microbiology
                elizabethkingia bruuniana,elizabethkingia,clinical characteristics,16s rrna,rpob,bacteria,taiwan,phylogeny,dna–dna hybridization,average nucleotide identity,fluoroquinolone resistance,quinolone resistance–determining regions,drug susceptibility,antimicrobial resistance,antimicrobial susceptibility

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