Diversity of mobile genetic elements in carbapenem-resistant Enterobacterales isolated from the intensive care units of a tertiary care hospital in Northeast India.

INTRODUCTION

Mobile genetic elements (MGEs) play a crucial role in the spread of carbapenem resistance. A study was undertaken to characterize MGEs and evaluate their contribution to the spread of carbapenem resistance in and collected from three intensive care units (ICUs) of a tertiary care hospital in Tripura.

METHODS

Isolates were subjected to susceptibility testing, genotypic detection of carbapenemases and their transmissibility, whole-genome sequencing (WGS), and phylogenomic analysis.

RESULTS

and were the dominant Enterobacterales, exhibiting resistance to the majority of antibiotics. WGS of carbapenemase-producing ( = 15/48,31%) and ( = 13/26,50%) revealed the presence of ( = 21), ( = 1), and ( = 8). Isolates were diverse and belonged to different sequence types, including epidemic clones (-ST16/101/147/231; -ST167/410/648). This study has noted the allelic shift of to similar to global reports. -bearing plasmids were conjugative but those carrying and were non-conjugative. were present in diverse replicons: IncF-types (predominant), IncHI1B, IncX3, and IncX4, etc., while were present in ColKP3, corroborating with global studies. was associated with intact/truncated IS in Tn, with IS, with IS, and IS in Tnb, and with ∆IS in Tn, depicting an ancestral genetic context noted globally. Study isolates were related to other Indian isolates, primarily from blood.

DISCUSSION

The association with different MGEs noted in the study is similar to those in other parts of India and the globe, signifying that the genetic determinants are part of the global gene pool. These associations can facilitate the spread of carbapenem resistance, leading to outbreaks and treatment failures.