Phenotypic and Genotypic Determination of Resistance to Common Disinfectants Among Strains of Pseudomonas Aeruginosa Producing and Non-Producing Biofilm Isolated From Iran
Abstract Background: One of the most important reasons for human mortality worldwide is Hospital-acquired infections, which can be controlled by efficient use of proper disinfectants for the Hospital settings. The main aim of the present survey was to assess the susceptibility of Pseudomonas aeruginosa producing and non-producing biofilm isolated to the five commonly used Hospital disinfectants, and evaluation of the synergistic effect of selective disinfectants and Ethylene-diamine-tetra acetic acid (EDTA), and the effect of exposure to sub-inhibitory concentrations of Sodium hypochlorite on antimicrobial susceptibility test.Results: The results showed that Sodium hypochlorite 5%, and Ethanol 70% is the most and less potent disinfectants against Pseudomonas aeruginosa, respectively. Clearly, the addition of EDTA increased the efficacy of selected disinfectants significantly. The changes in the antibiotic-resistance profiles after exposure to sub-inhibitory concentrations of disinfectants were observed for different classes of antibiotics. As well as near the all isolates harbored efflux pump genes and produced biofilm. Conclusion: For disinfection of Hospital surfaces and instruments, the mixture of disinfectant and EDTA were the most suitable selection in this study. In our study, it was clear that exposure to sub-inhibitory concentrations of disinfectants results in resistance to antibiotics. Also, strong and intermediate biofilm formers belonged to MDR/XDR strains.