Diversity of Carbapenem Resistance Mechanisms in Clinical Gram-Negative Bacteria in Pakistan

Linda Hadjadj, Muhammad Ali Syed, Shahid Ahmad Abbasi, Jean Marc Rolain, Bushra Jamil

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


Antibiotic resistance is a health challenge worldwide. Carbapenem resistance in Gram-negative bacteria is a major problem since treatment options are very limited. Tigecycline and colistin are drugs of choice in this case, but resistance to these drugs is also high. The aim of this study was to describe the diversity of resistance mechanisms in carbapenem-resistant clinical Gram-negative bacteria from Pakistan. Carbapenem-hydrolyzing enzyme-encoding genes were detected using PCR and DNA sequencing and clonal types determined by multilocus sequence typing (MLST). Forty-four carbapenem-resistant isolates were collected from the microbiology laboratory of Fauji Foundation Hospital and Al-Syed Hospital, Rawalpindi, Pakistan, including Klebsiella spp., Escherichia coli, Acinetobacter baumannii, Pseudomonas aeruginosa, Enterobacter cloacae, and Achromobacter xylosoxidans. blaNDM-1, blaNDM-4, blaNDM-5, blaNDM-7, blaOXA-48, and blaOXA-181 were detected in Enterobacteriaceae; blaOXA-23, blaOXA-72, and blaNDM-1 in A. baumannii, and blaVIM-6 and blaVIM-11 in P. aeruginosa. MLST analysis revealed several predominant clonal types: ST167 in E. coli, ST147 in Klebsiella pneumoniae, ST2 in Acinetobacter, and ST664 in P. aeruginosa. In Acinetobacter, a new clonal type was observed for the first time. To the best of our knowledge, this is the first study describing the clonality and resistance mechanisms of carbapenem-resistant Gram-negative bacteria in Pakistan.

Original languageEnglish
Pages (from-to)760-767
Number of pages8
JournalMicrobial Drug Resistance
Issue number6
Publication statusPublished - Jun 2021
Externally publishedYes


  • Pakistan
  • antibiotic resistance
  • carbapenem
  • multilocus sequence type
  • resistance


Dive into the research topics of 'Diversity of Carbapenem Resistance Mechanisms in Clinical Gram-Negative Bacteria in Pakistan'. Together they form a unique fingerprint.

Cite this