Investigation of the Emergence of Multi-Drug Resistance (MDR) Mediated by blaDHA β-lactamase in Pseudomonas aeruginosa Isolated from Patients
Subject Areas : microbiologyAzher Talib Alvan 1 , Bita Behboodian 2 , Samaneh Dolat Abadi 3 , Matin Setayesh 4
1 - Department of Biology, Faculty of Convergent Sciences and Technologies, SR.C., Islamic Azad University, Tehran, Iran.
2 - Department of Biology, Faculty of Basic Sciences, Ma.C., Islamic Azad University of Mashhad, Iran
3 - Department of Biology, Ne.C., Islamic Azad University, Neyshabur, Iran
4 - Biotechnology Research Center, Malek Ashtar University of Technology, Tehran, Iran
Keywords: Pseudomonas aeruginosa, Beta-Lactamases, blaDHA, Multi Drug Resistance, Biofilm ,
Abstract :
Pseudomonas aeruginosa is an opportunistic pathogen that causes chronic lung infections in cystic fibrosis patients. In addition, P. aeruginosa is one of the pathogens responsible for hospital infections. P. aeruginosa is highly resistant to antibiotics and has been placed in the "critical" group of pathogens by the WHO, in urgent need of new antibiotics. BlaDHA beta-lactamase is one of the members of Ambler's class C that was investigated in this study. In this research, clinical samples of blood, urine, wound and trachea from hospital infections from one of the selected hospitals in Razavi Khorasan were examined. P. aeruginosa samples were identified by biochemical tests. Their antibiotic sensitivity was evaluated by disk diffusion method. After primer design and bacterial DNA extraction, the frequency of blaDHA gene presence in isolates was evaluated by PCR technique. The rate of isolation of P. aeruginosa was 5.8% of all hospital infections, which is more from ICU (4%) and tracheal samples (4.5%). Antibiogram test results showed 100% resistance to Cefazolin and Ampicillin. After that, the highest level of resistance to the antibiotics Cefitizoxim (87.5%), Ceftriaxone (62.8%), Meropenem (52.6%), Cefepime (48.6%) and Levofloxacin (45.6%) was seen. In this study, the lowest level of resistance to Imipenem was observed (0.7%) and all isolates were reported to be sensitive to Doxycycline. After checking the PCR results, 2.3% of the isolates carried the blaDHA gene. The findings showed that the distribution of blaDHA gene in Iranian P. aeruginosa isolates is limited, although this issue needs more studies.
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