An investigation of type 3 secretion toxins encoding-genes of Pseudomonas aeruginosa isolates in a University Hospital in Egypt
Journal Title: Journal of Microbiology and Infectious Diseases - Year 2013, Vol 3, Issue 3
Abstract
Objective: Pseudomonas aeruginosa uses type 3 secretion system (T3SS) to directly inject four toxins into host cells. The aim of the study was to determine the prevalence of the toxins-encoding genes among P. aeruginosa isolates collected from nosocomial infections and environmental sources. Methods: Clonal relatedness of the studied P. aeruginosa isolates (n=85) was studied by RAPD typing. Multiplex PCR was performed on the 85 P. aeruginosa isolates (68 nosocomial isolates obtained from hospitalized patients present in different wards and departments, and 17 environmental isolates including 2 isolates from health-care worker hands from ICU) to detect the secretion toxins-encoding genes. Results: RAPD fingerprinting demonstrated that most strains were of distinct genotypes and determined the presence of 54 RAPD patterns. The prevalence of the genes among all isolates was as follows; exoT-100%, exoS- 40%, exoY- 83.5% and exoU- 62.4%. No significant differences in the prevalence of these genes were observed between nosocomial and environmental isolates or between isolates cultured from different sites of infection. The part of P. aeruginosa strains harboring either exoS (37.6%) or exoU (60%) gene was significantly higher (P<0.001) than that contained both genes (2.4%). Conclusion: ExoT was present in all isolates and exoS, exoY and exoU are variable traits with exoU gene was the third in prevalence after exoT and exoY. No significant differences in exoS, exoY and exoU prevalence were observed between nosocomial and environmental isolates or between isolates from different sites of infection. ExoS and exoU genes were mutually exclusive that almost all isolates contain either exoS without exoU or exoU without exoS. J Microbiol Infect Dis 2013; 3(3): 116-122 Key words: Pseudomonas aeruginosa, type 3 secretion toxins, multiplex PCR
Authors and Affiliations
Awny A. Gawish, Nahla A. Mohammed, Gehan A. El-Shennawy, Heba A. Mohammed
Keywords
Related Articles
- EP ID EP109629
- DOI 10.5799/ahinjs.02.2013.03.0093
- Views 137
- Downloads 0
Multidrug Resistant Bacterial Pathogens in the Indoor Air and Floors of Surgical Wards in a University Teaching Hospital
Multidrug Resistant Bacterial Pathogens in the Indoor Air and Floors of Surgical Wards in a University Teaching Hospital Ahmed Olowo-okere1, Musa Babandina2 1Department of Pharmaceutics and Pharmaceutical Microbiology, U...
Diagnostic significance of ascites adenosine deaminase levels in suspected tuberculous peritonitis in adults
Objective: There are contradictory reports about the use of adenosine deaminase (ADA) as a diagnostic marker in tuberculous peritonitis patients. Reports evaluating significance of ADA activity in the diagnosis of tuber...
Class 1 Integron, Sulfonamide and Florfenicol Resistance Genes in Bacteria from Three Unsanitary Landfills, Ibadan, Nigeria
Objective: Municipal solid waste (MSW) landfills recently emerged as potential reservoirs of antibiotic resistance. However, little is known about the potentials of unsanitary landfill sites which are common in developin...
UVB ışınlarının Stafilokok epidermidisdeki programlanmış hücre ölüm faaliyetleri üzerine etkileri
Amaç: İlaca dirençli Staphylococcus epidermidis neden olduğu bakteriyel deri hastalıkları, enfeksiyon hastalıklarının tedavi alanında büyük bir problem olarak bilinmektedir. Dirençli suşların artması farmakoterapiyle ber...
Helicobacter pylori genotypes among patients in a university hospital in Egypt: identifying the determinants of disease severity
Objective: To detect the various of H. pylori genotypes, determine the most prevalent one, and to identify the determinants of disease severity. Methods: Biopsies from 90 patients were collected, however 69 were exclus...