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Bokaeian M, Shahraki Zahedani S, Soltanian Bajgiran M, et al. Frequency of PER, VEB, SHV, TEM and CTX-M Genes in Resistant Strains of Pseudomonas aeruginosa Producing Extended Spectrum β-Lactamases. Jundishapur J Microbiol. 2014;8(1):e13783doi: 10.5812/jjm.13783.
Bokaeian, M., Shahraki Zahedani, S., Soltanian Bajgiran, M., & Ansari Moghaddam, A. (2015). Frequency of PER, VEB, SHV, TEM and CTX-M Genes in Resistant Strains of Pseudomonas aeruginosa Producing Extended Spectrum β-Lactamases. Jundishapur journal of microbiology, 8(1), e13783. https://doi.org/10.5812/jjm.13783
Bokaeian, Mohmmad, et al. "Frequency of PER, VEB, SHV, TEM and CTX-M Genes in Resistant Strains of Pseudomonas aeruginosa Producing Extended Spectrum β-Lactamases." Jundishapur journal of microbiology vol. 8,1 (2015): e13783. doi: https://doi.org/10.5812/jjm.13783
Bokaeian M, Shahraki Zahedani S, Soltanian Bajgiran M, Ansari Moghaddam A. Frequency of PER, VEB, SHV, TEM and CTX-M Genes in Resistant Strains of Pseudomonas aeruginosa Producing Extended Spectrum β-Lactamases. Jundishapur J Microbiol. 2014 Dec 08;8(1):e13783. doi: 10.5812/jjm.13783. eCollection 2015 Jan. PMID: 25789123; PMCID: PMC4350043.
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Jundishapur J Microbiol. 2014 Dec 08;8(1):e13783. doi: 10.5812/jjm.13783. eCollection 2015 Jan.

Frequency of PER, VEB, SHV, TEM and CTX-M Genes in Resistant Strains of Pseudomonas aeruginosa Producing Extended Spectrum β-Lactamases.

Jundishapur journal of microbiology

Mohmmad Bokaeian, Shahram Shahraki Zahedani, Morteza Soltanian Bajgiran, Alireza Ansari Moghaddam

Affiliations

  1. Department of Microbiology, School of Medicine, Zahedan University of Medical Sciences, Zahedan, IR Iran ; Research Center for Infectious Diseases and Tropical Medicine, Zahedan University of Medical Sciences, Zahedan, IR Iran.
  2. Department of Microbiology, School of Medicine, Zahedan University of Medical Sciences, Zahedan, IR Iran.
  3. Health Promotion Research Centre, Zahedan University of Medical Sciences, Zahedan, IR Iran.

PMID: 25789123 PMCID: PMC4350043 DOI: 10.5812/jjm.13783

Abstract

BACKGROUND: Pseudomonas aeruginosa is the most common pathogen causing nosocomial infections. Resistance of P. aeruginosa strains to broad-spectrum cephalosporins may be mediated by extended-spectrum β-lactamases (ESBLs).

OBJECTIVES: We intended to investigate the prevalence of ESBLs and antimicrobial susceptibilities of P. aeruginosa isolated from patients in Zahedan, Iran.

MATERIALS AND METHODS: In this cross-sectional study, during 2012-2013, 116 P. aeruginosa isolates were collected from a teaching hospital in Zahedan, Iran. Susceptibility to eight antimicrobial agents was carried out by disk diffusion method. The ESBL producing strains were detected by combination disk test (CDT). ESBL positive isolates as well as other isolates showing minimum inhibitory concentrations (MICs) ≥ 4 μg/mL for ceftazidime, cefotaxime, ceftriaxone and aztreonam, were screened for the presence of the genes encoding blaTEM, blaSHV, blaPER-1 and blaVEB-1, by polymerase chain reaction (PCR).

RESULTS: Ciprofloxacin and piperacillin were the most efficient antipseudomonal agents. The results disclosed that 19 (16.37%) of the isolates were multidrug resistant and 8 (6.89%) were ESBL-positive. Of the 116 isolates, 30 (25.86%) were resistant to at least one of the antibiotics ceftazidime, ceftriaxone, cefotaxime or aztreonam and among these 30 (100%), 4 (13.3%), 2 (6.6%) and 2 (6.6%), amplified blaTEM, blaVEB-1, blaPER-1 and blaSHV, respectively. From the 30 TEM-positive isolates, 22 were ESBL-negative. Sequencing of the ESBL genes verified the accuracy of the PCR products.

CONCLUSIONS: According to our results, blaTEM-116 was the most frequent isolated ESBL gene among the P. aeruginosa strains isolated from patients.

Keywords: Extended-Spectrum beta-Lactamase; Pseudomonas aeruginosa

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