Effectiveness of Antipseudomonal Antibiotics and Mechanisms of Multidrug Resistance in Pseudomonas aeruginosa


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Polish Journal of Microbiology

Polish Society of Microbiologists

Subject: Microbiology


ISSN: 1733-1331
eISSN: 2544-4646





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VOLUME 65 , ISSUE 1 (March 2016) > List of articles

Effectiveness of Antipseudomonal Antibiotics and Mechanisms of Multidrug Resistance in Pseudomonas aeruginosa

Mohamed E. El Zowalaty * / Béla Gyetvai

Keywords : Pseudomonas aeruginosa, antibiotics, antimicrobial, carbapenems, efflux pump, mechanisms, metallo-β-lactamases, polymyxins, mutidrug, resistance

Citation Information : Polish Journal of Microbiology. Volume 65, Issue 1, Pages 23-32, DOI: https://doi.org/10.5604/17331331.1197272

License : (CC BY-NC-ND 4.0)

Received Date : 05-January-2015 / Accepted: 26-August-2015 / Published Online: 15-March-2016



Pseudomonas aeruginosa is a leading human pathogen that causes serious infections at various tissues and organs leading to life threaten­ing health problems and possible deadly outcomes. Resistance patterns vary widely whether it is from hospitals or community acquired infections. Reporting resistance profiles to a certain antibiotics provide valuable information in a given setting, but may be extrapolated outside the sampling location. In the present study, P. aeruginosa isolates were screened to determine their susceptibilities against antipseudomonal antimicrobial agents and possible existing mechanisms of resistance were determined. Eighty-six isolates of P. aeruginosa were recovered. Isolates representing different resistance profiles were screened for the existence of three different resistance mechanisms including drug inactivation due to metallo-β-lactamases, drug impermeability by outer membrane proteins and drug efflux. All tested iso­lates showed uniform susceptibility (100%, n = 86/86) to piperacillin, meropenem, amikacin, and polymyxin B. A single isolate was found to be imipenem resistant (99%, n = 85/86). The possible mechanisms of resistance of P. aeruginosa to imipenem involve active drug efflux pumps, outer membrane impermeability as well as drug inactivating enzymes. These findings demonstrate the fundamental importance of the in vitro susceptibility testing of antibiotics prior to antipseudomonal therapy and highlight the need for a continuous antimicrobial resistance surveillance programs to monitor the changing resistance patterns so that clinicians and health care officials are updated as to the most effective therapeutic agents to combat the serious outcomes of P. aeruginosa infections.

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