650. Genomic Analysis of Shiga Toxin-producing Escherichia coli From Symptomatic Patients and Asymptomatic Carriers. (26th November 2018)

• Record Type: Journal Article
• Authors: Baba, Hiroaki; Kanamori, Hajime; Kudo, Hayami; Kuroki, Yasutoshi; Higashi, Seiya; Oka, Kentaro; Takahashi, Motomichi; Makino, Yuko; Oe, Chihiro; Oshima, Kengo; Aoyagi, Tetsuji; Yoshida, Makiko; Tokuda, Kouichi; Kaku, Mitsuo
• Is Part Of: Open forum infectious diseases. Volume 5(2018)Supplement 1
• Page Start: S235
• Page End: S236
• Publication Date: 2018-11-26
• Subjects: Communicable diseases -- Periodicals; Medical microbiology -- Periodicals; Infection -- Periodicals; 616.9
• DOI: 10.1093/ofid/ofy210.657
• Languages: English
• ISSNs: 2328-8957

Abstract

Abstract: Background: Shiga toxin-producing Escherichia coli (STEC) causes serious gastrointestinal illness. Although O157 is predominant, non-O157 infections have been increasingly reported worldwide. We used whole-genome sequencing (WGS) to investigate molecular characteristics and phylogeny of STEC isolates. Methods: A total of 22 STEC isolates from symptomatic patients ( n = 13) and asymptomatic carriers ( n = 9) in a Japanese region during 2016–2017 were used. Serogroups were O157, O26 and O103 ( n = 5, 12, and 5, respectively). WGS was performed using an Illumina Miseq. Genomic analysis was performed using web-based tools by the Center for Genomic Epidemiology. Single nucleotide polymorphism detection and construction of phylogenetic tree were performed using Mauve software. Results: Of 76 virulence genes, 32 (42%) were detected (Figure 1). Eighteen (82%) and 7 (32%) isolates contained stx1 and stx2, respectively. Twelve (91%) contained eae . stx2 was more frequent in isolates from patients ( P < 0.05), whereas cba was more frequent in isolates from carriers ( P < 0.05). stx2, etpD were more frequent in O157 isolates ( P < 0.05, respectively), whereas stx1, efa1, cif, tccP, cba, lpfA were more frequent in non-O157 isolates ( P < 0.05, respectively). Nine acquired resistance gene ( aph(3′)-Ia, bla TEM-1b, dfrA5, dfrA8, strA, strB, sul 2, tetA, tetB ) were detected, while at least one was found in 6 (27%) isolates. Isolates from patients (5/13, 38%) were likely to have more resistance genes than isolates from carriers (1/9, 11%) ( P = 0.33). Genotyping and multilocus sequence typing revealed all O26 isolates belonged to O26:H11 ST21, O103 belonged to O103:H2 ST17 and novel O103:H8 ST2836, while O157 belonged to O157:H7 ST11 and ST2966 (Figure 2). Phylogenetic tree showed O103:H8 ST2836 isolates clustered with O26, separated from O103:H2 ST17 (Figure 3). In a cluster of O26:H11 ST21 isolates, isolates from carriers formed a subcluster. O157 isolates clustered in a separate lineage. O157:H7 ST2966 isolates evolved from ST11. Conclusion: Of the non-O157 isolates, O26:H11 ST21, which contained as many virulence genes as O157, was prevalent among both patients and carriers in our region, highlighting the importance of monitoring genomic characteristics of non-O157 STEC. Disclosures: All authors: No reported disclosures.