Considerable Rate of Putative Virulent Phylo-Groups in Fecal Carriage of Extended-Spectrum Β-Lactamase Producing Escherichia Coli Publisher Pubmed



Aghamohammad S¹ ; Badmasti F¹ ; Shirazi AS¹ ; Dabiri H² ; Solgi H³ ; Sabeti S⁴ ; Shahcheraghi F¹
Source: Infection, Genetics and Evolution Published:2019

Abstract

Extended-Spectrum Beta–lactamase producing Enterobacteriales (ESBL-PE)in fecal carriage have become a global health concern. Detection of putative virulent ESBL-producing E.coli (ESBL-EC)isolates among asymptomatic carriers is a threatening issue in public health. The aim of this study was to investigate the intestinal carriage of ESBL-EC, phylo-groups and clonal relatedness among putative virulent groups of ESBL-EC isolated from fecal carriages. A total of 120 rectal swabs; 50.8% (61/120)from inpatients of intensive care unit (ICU)and 49.2% (59/120)from outpatients were collected. The ESBL-EC screening was performed by using MacConkey agar supplemented with cefotaxime. PCR assays were applied for determination of phylo-groups, detection of ESBL and carbapenemase genes. Conjugation experiment, plasmid replicon typing and Multilocus Sequence Typing (MLST)were performed for putative virulent phylo-groups. Totally, of 120 studied individuals, 60.0% (72/120)were carrier for ESBL-EC. The rate of blaCTX-M-15, blaTEM, blaSHV was 90.2% (65/72), 50.0% (36/72)and 5.5% (4/72), respectively. The frequency of phylo-groups A, B1, B2, C, D, and F were 20.8% (15/72), 6.9% (5/72), 20.8% (15/72), 2.7% (2/72), 13.8 (10/72)and 12.5% (9/72), respectively. In conjugation experiments, of 6 tested isolates, 5 had conjugative plasmids. The most prevalent plasmid types belonged to IncF incompatibility groups. The MLST analysis showed that the main sequence types among ESBL-EC isolates were ST769 and ST472. The current study provides novel information about the presence of the ESBL-EC isolates, particularly putative virulent phylo-groups among fecal carriages in Iran. Our data revealed that there was almost high ST heterogeneity among putative ESBL-EC isolates. In order to implementation of effective infection control program, detection of fecal carriage in appropriate time typically at the beginning of admission to the hospital is recommended. © 2019 Elsevier B.V.