Role of Class I, II and III Integrons in Multidrug Resistance in Pseudomonas aeruginosa Isolated from Nosocomial Hospital

Aims: The increasing usage of antibiotics can cause resistance to the treatment of infections, which can caused by bacteria, e.g. Pseudomonas aeruginosa. The aim of this study was to trace the class I, II and III integrons in isolates of P. aeruginosa of nosocomial infection and determining the antibiotic resistance pattern of the bacteria. Instrument Methods: In this crosssectional study, 100 Pseudomonas aeruginosa clinical isolates of infected wounds, bedsores, burns, urinary tract infections and respiratory tract infections were collected from patients of 3 Isfahan City hospitals, Iran (Al Zahra, Kashani, Shariati) in 2015. After identification tests and antibiogram, integrons class I, II and III were detected by MPCR method. Data analysis were performed in SPSS 16 software using Chisquare and Fisher exact tests and the relationship between the presence of class III, II, I was calculated by MPCR test. Findings: All isolates had multiple antibiotic resistances. The highest antibiotic resistance was to Tetracycline (85%) and the lowest to Norfloxacin (12.5%). There were significant differences between class I and the two other classes of integrons (p=0.036). There was a statistically significant difference between the presence of blaTEM gene in Pseudomonas aeruginosa with other coding genes for antibiotic resistance (p=0.029). Conclusion: Pseudomonas aeruginosa isolates are multidrug resistant and almost all isolates from clinical infections have class I, II and III Integrons.