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Microb Pathog. 2017 Apr;105:240-244. doi: 10.1016/j.micpath.2017.02.039. Epub 2017 Feb 28.

CTX-M-15 and OXA-10 beta lactamases in multi drug resistant Pseudomonas aeruginosa: First report from Pakistan.

Author information

1
Department of Biotechnology and Genetic Engineering Kohat University of Science & Technology, Kohat, Khyber Pakhtunkhwa, Pakistan; Department of Microbiology Kohat University of Science & Technology, Kohat, Khyber Pakhtunkhwa, Pakistan.
2
Department of Microbiology Kohat University of Science & Technology, Kohat, Khyber Pakhtunkhwa, Pakistan.
3
Department of Biotechnology and Genetic Engineering Kohat University of Science & Technology, Kohat, Khyber Pakhtunkhwa, Pakistan.
4
Department of Biotechnology and Genetic Engineering Kohat University of Science & Technology, Kohat, Khyber Pakhtunkhwa, Pakistan. Electronic address: noormwazir@yahoo.com.

Abstract

BACKGROUND:

Pseudomonas aeruginosa is an emerging threat to public health worldwide due to their rapid development of drug resistance including beta-lactamases. The present study was designed to investigate the incidence of β-lactamases and genotypic pattern of CTX and OXA in the clinical isolate of multidrug resistant P. aeruginosa.

METHODS:

In this study a total of 102 MDR P. aeruginosa isolates obtained from Lady Reading Hospital, Peshawar, Pakistan were subjected to extended spectrum beta lactamase (ESBL), metallo beta lactamase (MBL) and plasmid mediated β-lactamase (AmpC) detection using phenotypic and molecular methods. Furthermore, sequencing of CTX and OXA gene was performed.

RESULTS:

Out of 102 MDR P. aeruginosa isolates, 71 (69.6%) were beta lactamase producers. The incidence of ESBL, MBL and AmpC in clinical isolates of P. aeruginosa was found to be 23.94%, 40.84% and 35.21% respectively. Co-production of ESBL and AmpC were also observed in some isolates. There were 14 (19.71%) CTX-M-15 harboring isolates which were ESBL (64.28%), MBL (21.42%) and AmpC (14.28%) producer. Co-production of ESBL/MBL (14.28%), ESBL/AmpC (14.28%) and MBL/AmpC (14.28%) were also observed in the CTX M-15 harboring isolates while 12.28% isolates were not ESBL, MBL or AmpC producer. OXA-10 was detected in 8 (11.26%) isolates which were ESBL (12.5%), MBL (37.5%) and AmpC (12.5%) producer. OXA 10 isolates also exhibit co-production of ESBL/AmpC (12.5%) and MBL/AmpC (12.5%). All CTX-M-15 carried the class A β-lactamase conserved domain while OXA-10 harbored conserved domain of class D β-lactamase.

CONCLUSION:

The current study for the first time reported and characterized the CTX-M-15 and OXA-10 among MDR P. aeruginosa isolates from Pakistan. Further efforts are needed to understand the molecular mechanism of drug resistance with CTX and OXA harboring P. aeruginosa isolates.

PMID:
28258003
DOI:
10.1016/j.micpath.2017.02.039
[Indexed for MEDLINE]

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