Abstract:
BACKGROUND:This study aimed to identify ten different 16S rRNA methyltransferase genes (rmtA, rmtB, rmtC, rmtD, armA, rmtF, npmA, rmtH, rmtE and rmtG) and their coexisting ESBL and carbapenemase with the emergence of three E.coli clones within a single study centre. METHODS:A total of 329 non-duplicate E.coli isolates were studied to detect the presence of 16S rRNA methyltransferases along with β-lactamases (TEM, SHV, OXA, VEB, GES, PER,CTX-M types, NDM, OXA-48,VIM, IMP and KPC) using PCR assay. Horizontal transferability were validated by transformation and conjugation analysis. Plasmid incompatibility typing and MLST analysis was also performed. RESULTS:A total of 117 isolates were found to be resistant to at least one of the aminoglycoside antibiotics. It was observed that 77 (65.8%) were positive for 16S rRNA methyltransferases. Among them thirty nine isolates were found to harbour only blaCTX-M-15, whereas combination of genes were observed in three isolates (blaVEB+ blaCTX-M-15 in 2 isolates and blaPER + blaCTX-M-15 in 1 isolate). blaNDM and blaOXA-48 like genes were found in 23 and 9 isolates, respectively. All the resistance genes were conjugatively transferable, and incompatibility typing showed multiple 16S rRNA methyltransferase genes were originated from a single Inc. I1 group. MLST analysis detected 3 clones of E.coliST4410, ST1341 and ST3906. CONCLUSION:The present study identified emergence of three clones of E.coli, resistant to aminoglycoside -cephalosporin- carbapenem. This warrants immediate measures to trace their transmission dynamics in order to slow down their spread in clinical setting.
journal_name
BMC Infect Disjournal_title
BMC infectious diseasesauthors
Wangkheimayum J,Bhattacharjee M,Das BJ,Singha KM,Chanda DD,Bhattacharjee Adoi
10.1186/s12879-020-05264-4subject
Has Abstractpub_date
2020-07-25 00:00:00pages
544issue
1issn
1471-2334pii
10.1186/s12879-020-05264-4journal_volume
20pub_type
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