Serotyping and Multiple Antibiotic Resistance Patterns of Shigella Sonnei Isolated from Diarrhea in Children’s Medical Center of Tehran

Abstract

Background and Aim: In today’s world, antibiotic resistance is inevitable. This has been the case since the discovery of antibiotics. The aim of this research is to study serotyping and multiple antibiotic resistance pattern of Shigella sonnei isolated from diarrheal stool of patients hospitalized in Children’s Medical Center in Tehran. Materials and Methods: In this descriptive study, 600 diarrheal stool specimens were obtained from patients hospitalized in Children’s Medical Center in Tehran over a period of twelve months. The stool samples were collected in Cary-Blair transport medium and transferred to the laboratory. The identification was carried out according to the standard cultivation method, and the antibiotic susceptibility test was performed by Kerry Bauer disk method according to with CLSI procedure. Results: Out of 600 samples, only 18 (3%) were found to be contaminated with Shigella sonnei. The results of antibiotic resistance patterns of these isolates showed that they were resistant to tetracycline; streptomycin, clindamycin and cortimoxazol. Furthermore, 66.67% of isolates had multiple resistance to tetracycline, cortimoxazol, streptomycin, ticarcillin and clindamycin antibiotics. Conclusion: The results of this study showed that multiple resistance of Shigella sonnei to tested antibiotics is increasing. This is alarming; necessary steps should be taken to prevent such a phenomenon.

Keywords

• antimicrobial susceptibility
• shigella sonnei
• serology
• diarrhea
• children