Antibiotic Resistance Profiling of MRSA and P. aeruginosa

Finally, for the determination of antibiotic susceptibility and MDR patterns of MRSA isolates, the Kirby-Bauer procedure was done according to CLSI recommendations as above mentioned for the following antibiotics: clindamycin (CD; 2 μg), trimethoprim-sulfamethoxazole (TS; 1.25 μg), gentamicin (GM; 10 μg), erythromycin (E; 15 μg), and linezolid (LZD; 30 μg) for S. aureus, as well as nalidixic acid (NA; 30 μg), colistin (CT; 10 μg), ampicillin (AMP; 10 μg), piperacillin (PRL; 100 μg), imipenem (IMP; 10 μg), cefepime (CPE; 30 μg), and chloramphenicol (C; 30 μg) for P. aeruginosa (Wayne, 2010 ). S. aureus ATCC 25923 was applied as the quality control. Finally, by observing at least one or more antibiotic resistances for three or more classes of antibiotics, MDR in selected MRSA and P. aeruginosa isolates was characterized (Mirzaei et al., 2022a (link)).

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Mirzaei R., Esmaeili Gouvarchin Ghaleh H, & Ranjbar R. (2023). Antibiofilm effect of melittin alone and in combination with conventional antibiotics toward strong biofilm of MDR-MRSA and -Pseudomonas aeruginosa. Frontiers in Microbiology, 14, 1030401.

Publication 2023

Ampicillin Antibiotic Antibiotic resistances Antibiotics Cefepime Chloramphenicol Clindamycin Colistin Erythromycin Gentamicin Imipenem Linezolid Mrsa Nalidixic acid P aeruginosa Piperacillin S aureus Susceptibility Trimethoprim sulfamethoxazole

Corresponding Organization : Baqiyatallah University of Medical Sciences

Other organizations : Hamedan University of Medical Sciences

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Variable analysis

independent variables

Antibiotic concentrations used in the Kirby-Bauer procedure: clindamycin (CD; 2 μg), trimethoprim-sulfamethoxazole (TS; 1.25 μg), gentamicin (GM; 10 μg), erythromycin (E; 15 μg), linezolid (LZD; 30 μg), nalidixic acid (NA; 30 μg), colistin (CT; 10 μg), ampicillin (AMP; 10 μg), piperacillin (PRL; 100 μg), imipenem (IMP; 10 μg), cefepime (CPE; 30 μg), and chloramphenicol (C; 30 μg)

dependent variables

Antibiotic susceptibility and MDR patterns of MRSA and P. aeruginosa isolates

control variables

S. aureus ATCC 25923 was used as the quality control

positive controls

S. aureus ATCC 25923

negative controls

None mentioned

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