Prevalence, Antibiotic Resistance Pattern, Screening of psm A and psm B Gene Expression, and in Vitro Analysis of Biofilm Formation of Staphylococcus aureus Isolated from Clinical Samples | ||
| Infection Epidemiology and Microbiology | ||
| Article 1, Volume 8, Issue 3, 2022, Pages 185-192 PDF (519.51 K) | ||
| Document Type: Original Research | ||
| DOI: 10.52547/iem.8.3.185 | ||
| Authors | ||
| ِDavood Azadi1; Pegah Khandan Del2; Mohammad Shafiee3; Ali Asghar Ayatollahi4; Ania Ahani Azari2; Abolfazl Khandan Del* 5; Mehdi Safarabadi1 | ||
| 1Molecular and medicine research center, Khomein University of Medical Sciences, Khomein, Iran | ||
| 2Department of Microbiology, Gorgan Branch, Islamic Azad University, Gorgan, Iran | ||
| 3Stem cell Research Center, Golestan University of Medical Sciences, Gorgan, Iran | ||
| 4Medical Laboratory Sciences Research Center, Golestan University of Medical Sciences, Gorgan, Iran | ||
| 5Infectious Diseases Research Center, Golestan University of Medical Sciences, Gorgan, Iran | ||
| Abstract | ||
| Backgrounds: Staphylococcus aureus is one of the major causes of nosocomial infections. Biofilm formation is an important virulence factor of S. aureus, leading to its high resistance to antibiotics and evasion from host defenses. This study aimed to assess the prevalence and antimicrobial resistance profile of biofilm-producing S. aureus strains and characterize genes involved in biofilm formation. Materials & Methods: A total of 79 S. aureus strains were isolated from 1000 clinical samples and characterized using phenotypic, biochemical, and molecular tests. The biofilm production ability of isolates was examined using the microtiter assay. Moreover, the expression of genes involved in biofilm production (psm A and psm B) was screened using real-time PCR. Finally, antibiotic susceptibility testing was done using the Kirby-Bauer method and interpreted according to the CLSI M100 standard. Findings: Out of 79 S. aureus isolates, 43 (54.4%) isolates were strong biofilm producers, 21 (26.6%) isolates were weak biofilm producers, and 15 (19%) isolates were non-adhesive. The results of real-time PCR showed that 55 (86%), 60 (93.7%), and 46 (58.2%) isolates were positive for psm A, psm B, and both genes, respectively. The results of antibiotic susceptibility testing showed that all the isolates were resistant to two or more antibiotics. Conclusion: The high prevalence of biofilm-forming S. aureus strains in hospital environments could be a major health challenge with serious outcomes for hospitalized patients. Thus, it is necessary to disinfect hospital environments to reduce the risk of infection and spread of these microorganisms. | ||
| Keywords | ||
| Staphylococcus aureus; Biofilm; Real-time PCR; Antibiotic susceptibility | ||
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