Abstract
Plasmid-mediated AmpC (pAmpC) and ESBL co-production was detected in Escherichia coli a major etiologic agent of urinary tract infection. Isolates resistant to cefoxitin by CLSI methodology were tested for pAmpC beta-lactamase using phenylboronic acid and ESBLs by combined disk diffusion method. pAmpC/ESBL genes were characterized by PCR and sequencing. Transconjugation experiments were done to study the transfer of pAmpC and ESBL production from clinical isolates as donor to E. coli J53 AziR as recipient. Incompatibility groups of transmissible plasmids were classified by PCR-based replicon typing (PBRT). Among 148 urine culture positive isolates, E. coli was reported in 39.86 % (59/148), with 93.22 % (55/59) of cefoxitin resistance. pAmpC production was detected in 25, with varied distribution of blaCMY-2 and blaDHA-1type genes alone (n = 13 and 7 respectively) or in combination (n = 5). ESBL co-production was observed in 88 % (22/25) of pAmpC producing isolates with predominance of blaTEM (n = 20). Twenty-three transconjugants showed transmission of pAmpC-and ESBL-resistant genes with co-carriage of blaCMY-2 and blaTEM (n = 15) in plasmids of IncF type (n = 9) being predominant, followed by IncI1 (n = 4) and IncH1 (n = 2) in combination. All clinical isolates were clonally diverse. Resistance against different beta-lactams in uropathogenic E. coli has been an emerging concern in resource- poor countries such as India. Knowledge on the occurrence of AmpC beta-lactamases and ESBL amongst this pathogen and its transmission dynamics may aid in hospital infection control.
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Acknowledgment
The authors would like to thank Professor Nandita Basu, Director, School of Tropical Medicine, Kolkata, West Bengal, India and Professor Bibhuti Saha, Head, Department of Tropical Medicine, School of Tropical Medicine, Kolkata, West Bengal, India for their kind support to successfully carry out the research work.
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Ghosh, B., Mukherjee, M. Emergence of co-production of plasmid-mediated AmpC beta-lactamase and ESBL in cefoxitin-resistant uropathogenic Escherichia coli . Eur J Clin Microbiol Infect Dis 35, 1449–1454 (2016). https://doi.org/10.1007/s10096-016-2683-z
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DOI: https://doi.org/10.1007/s10096-016-2683-z