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Biomedical subjects

Sesin Kocagöz

Publications and source records attributed to Sesin Kocagöz.

5 recordsLinked to original sources
PubMed2006

Evaluation of a chromogenic medium for rapid detection of extended spectrum beta-lactamase producing Salmonella spp.

BACKGROUND & OBJECTIVES: Salmonella spp. resistant to second- and third-generation cephalosporins and related antibiotics by production of various extended-spectrum beta-lactamases (ESBLs) are on the rise in Turkey. Early detection of ESBL producing Salmonella is important to institute appropriate treatment in time. In this study rapid detection of ESBL production among clinical isolates of Salmonella was evaluated using double-disk synergy test in a new chromogenic medium. The colour of the medium changes from red to yellow with bacterial growth and red circular inhibition zones are produced around disks containing antibacterials. METHODS: A total of 182 clinical isolates of Salmonella were evaluated in this study. The presence of ESBLs in clinical isolates was determined by double-disk synergy test using Mueller-Hinton (MH) agar and Quicolor E&S agar plates. RESULTS: Six isolates were shown to harbour ESBL enzymes with double disk synergy test by Mueller Hinton agar. The same results were obtained using Quicolor E&S agar after 4-6 h by changing its colour in response to the metabolic activity of growing bacteria. INTERPRETATION & CONCLUSION: Our findings showed that with this new medium, the results can be evaluated rapidly within 4-6 h and the enhancement of inhibition zones can be easily detected with the colour changes thus enabling the treating physician to institute the right treatment regimen immediately.

Bacteriological Techniques↗
PubMed2004

Molecular genotyping of methicillin-resistant Staphylococcus aureus strains in a teaching hospital in Turkey.

Methicillin-resistant Staphylococcus aureus (MRSA) is one of the major causes of nosocomial infections in our hospital. Therefore, we aimed to characterize MRSA isolates phenotypically from patients with nosocomial infections at Cumhuriyet University Hospital between December, 1999, and June, 2001, in Sivas by analysis of antibiotic patterns and genotypically using pulsed-field gel electrophoresis (PFGE) and repetitive element sequence-based polymerase chain reaction (rep-PCR). Forty-three nosocomial isolates were collected from various wards. All isolates were resistant to penicillin, tetracycline, oxacillin, and gentamicin. By rep-PCR and by separation of SmaI fragments of genomic DNA using PFGE, one major type (eight subtypes with PFGE) was identified among the strains. This clone was found to be different than some clones such as Iberian, Brazilian, and a major clone that was found in another Turkish University Hospital in Ankara. According to our results, there is a major MRSA clone with a potential to spread in our hospital. Infection control measures should be directed toward restricting the further spread of this clone. Therefore, in accordance with these findings, a surveillance culturing program should be established.

Bacterial Typing Techniques↗
PubMed2003

Factors affecting the antibacterial effects of Nd:YAG laser in vivo.

BACKGROUND AND OBJECTIVES: One of the main advantages of laser surgery is it's bactericidal effect which reduces the risk of postoperative infections. Several study designs have been set to investigate this effect. Aim of this study was to research if the bactericidal effect of laser tool was affected from several factors in vitro studies. STUDY DESIGN/MATERIALS AND METHODS: To determinate and investigate the bactericidal effect of laser in an original model, alpha-hemolytic streptococcus, Bacterioides fragilis, Neisseria, Streptococcus salivarius, Staphylococcus aureus, and Candida albicans were prepared in 10(4), 10(6) and 10(8) inoculum and placed in Mueller-Hinton Broth which have five different proportions of sheep blood. Samples which exposed with various energy levels of Nd:YAG laser were spread on agar plates, and at the end of an incubation time the colonization counted comparatively. The lowest energy level without colonization was accepted as minimal bactericidal energy level. RESULTS: Highest minimum bactericidal energy level is used for alpha-hemolytic streptococcus and lowest values for neisseria. Bactericidal effect decreased on suspensions, of which population of microorganisms are high and hemoglobin concentration was high in the broth. CONCLUSIONS: These findings suggest that the Nd:YAG laser has a higher bactericidal effect when sheep blood is added to the media. Factors like population and type of bacteria in the irradiated suspension affect minimum bactericidal energy level.

Animals↗
PubMed2002

[Comparison of routine sensitivity tests and mecA gene analysis for determination of methicillin resistance in Staphylococcus aureus isolates].

Currently, oxacillin disk diffusion test is the most frequently employed method to detect the methicillin resistance of Staphylococcus aureus isolates. However, due to some of the test conditions, errors may occur during the detection of heteroresistant bacteria. It is now widely accepted that lower incubation temperatures (< or = 35 degrees C) and media with a NaCl concentration of 2-4%, could facilitate detection. In our study, methicillin (oxacillin) susceptibilities of 125 S. aureus isolates were determined by the disk diffusion and microdilution tests as defined by National Committee for Clinical Laboratory Standards (NCCLS), and the results were compared with those of mecA gene analysis. In the routine susceptibility tests, 75 isolates were found to be methicillin resistant (MRSA), whereas 50 were found to be susceptible (MSSA). Various induction tests were performed to investigate the heterogeneous resistance among methicillin-susceptible isolates. These induction tests showed that the MIC values of seven isolates reached to the resistant levels, therefore these isolates should be accepted as "borderline oxacillin resistant S. aureus" isolates lacking the mecA gene. The susceptibility tests and mecA gene analysis of the remaining isolates yielded compatible results. In conclusion, susceptibility tests, when performed according to NCCLS recommendations, are found to be reliable and decisive, for the detection of methicillin resistance of S. aureus.

Bacterial Proteins↗