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Journal Cover   American Journal of Infectious Diseases and Microbiology
  [14 followers]  Follow
  This is an Open Access Journal Open Access journal
   ISSN (Print) 2328-4056 - ISSN (Online) 2328-4064
   Published by Science and Education Publishing Homepage  [72 journals]
  • Topoisomerases II Mutations in Ciprofloxacin-resistant Clinical Isolates
           of Pseudomonas aeruginosa in Makassar, Indonesia

    • Authors: Irene E.Rieuwpassa; Ressy Dwiyanti, Yadi Yasir, Muhammad Sabir, Mochammad Hatta
      Pages: 91 - 94
      Abstract: Background: Ciprofloxacin constitute a clinically successful and widely used class of broad-spectrum antibiotics; however, the emergence and spread of resistance increasingly limits the use of this fluoroquinolone in the treatment and management of microbial disease. Ciprofloxacin is the most frequently used member of the fluoroquinolones during initial eradication therapy of Pseudomonas aeruginosa. The emergence of ciprofloxacin-resistant Pseudomonas aeruginosa (P. aeruginosa) has been reported. In this study, we examined mutations in the quinolone resistance-determining regions of the topoisomerase II (GyrA) genes of 11 clinical isolates of P. aeruginosa that resistance to ciprofloxacin. Methods: In this study we examined the relationship between gene mutations of topoisomerase II (gyrA) with ciprofloxacin resistance of P. aeruginosa. The examination performed by disc diffusion test followed by RFLP-PCR. Results: The results of disc diffusion test showed that 13 samples were sensitive to ciprofloxacin, 11 samples were resistant to ciprofloxacin. In this study we found mutation in GyrA in 6 (54.5%) of ciprofloxacin resistant samples. There was no mutation found in ciprofloxacin sensitive samples. Conclusion: Mutation in topoisomerases genes are the main mechanism of fluoroquinolone resistance in P. aeruginosa.
      PubDate: 2015-05-07
      Issue No: Vol. 3, No. 3 (2015)
  • Characterization of Some Genotypic and Phenotypic Traits of Biofilm
           Producing Clinical Isolates of Methicillin Resistant Staphylococcus

    • Authors: Malaka Farouk El Moufti; Manal Baddour, Reem Abdel Hameed Harfoush, Hoda Mohamed Aly Owais
      Pages: 95 - 103
      Abstract: Staphylococcus epidermidis is a major commensal bacterium. Various strains of methicillin resistant S. epidermidis are capable of forming biofilms and it is found to be associated with many hospital-acquired infections. Bacterial biofilms, which are micro-colonies encased in extracellular polysaccharide material, mediated by gene products of the icaADBC operon, are the sources of many bacterial infections which is so difficult to respond to routine treatments. In this research, we investigated the biofilm forming capacity of a 100 methicillin resistant staphylococcus epidermidis isolates, isolated from different clinical specimens delivered to the Diagnostic Microbiology Laboratories and Surveillance Laboratory, Faculty of Medicine, Alexandria University, in relation to the icaADBC gene cluster. Also, the minimum inhibitory concentration (MIC) and minimum biofilm eradication concentration (MBEC) assays were used to evaluate the antibiotic sensitivity patterns of these MRSE isolates in their planktonic and biofilm phases to Vancomycin and Linezolid. The results showed that only 27 isolates (27%) produced detectable biofilm, and icaADBC gene was detected in only 5 of these isolates. Moreover, there was no statistical association between the presence of the gene and the biofilm status. All 27 biofilm producing isolates were susceptible to both Vancomycin and Linezolid in their planktonic state, but the MBEC values of Vancomycin were higher than those of Linezolid in almost all strains, with an agreement between both MBEC values in 15/27 (55.5%) of isolates and disagreement in 12/27 (44.5%) of isolates, and this was statistically significant (p
      PubDate: 2015-05-12
      Issue No: Vol. 3, No. 3 (2015)
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