Biofilm-forming ability and adherence to poly-(methyl-methacrylate) acrylic resin materials of oral Candida albicans strains isolated from HIV positive subjects

PURPOSE: This study evaluated the adhesion to acrylic resin specimens and biofilm formation capability of Candida albicans strains isolated from HIV positive subjects' oral rinse solutions. MATERIALS AND METHODS: The material tested was a heat-cured acrylic resin (Acron Duo). Using the adhesion and crystal violet assays, 14 oral Candida albicans isolated from HIV-positive subjects and 2 references Candida strains (C. albicans ATCC 90028 and C. albicans ATCC 90128) were compared for their biofilm production and adhesion properties to acrylic surfaces in vitro. RESULTS: There were no significant differences in adhesion (P=.52) and biofilm formation assays (P=.42) by statistical analysis with Mann-Whitney test. CONCLUSION: Denture stomatitis and increased prevalence of candidal carriage in HIV infected patients is unlikely to be related to the biofilm formation and adhesion abilities of C. albicans to acrylic resin materials.

Comparison of hybrid capture and reverse transcriptase polymerase chain reaction methods in terms of diagnosing human cytomegalovirus infection in patients followings hematopoietic stem cell transplantation

Human cytomegalovirus [CMV] is a life threatening cause of infection among hematopoietic stem cell recipients. Developing reliable methods in detecting the CMV infection is important to identify the patients at risk of CMV infection and disease. The aim of this study was to compare the 2 tests- hybrid capture test, which is routinely used in the diagnosis of CMV infection among hematopoietic stem cell recipients, and reverse transcriptase polymerase chain reaction [RT-PCR] detecting UL21.5 mRNA transcripts of the active virus. In this prospective study, a total of 178 blood samples obtained from 35 patients following allogeneic hematopoietic stem cell transplantation at the Bone Marrow Transplantation Unit of the Hematology Department, Ibn-i Sina Hospital of Ankara University School of Medicine, Turkey between January 2003 and September 2003 were analyzed. Hybrid capture and RT-PCR using UL21.5 gene transcript method to investigate HCMV in blood samples were performed at the Department of Microbiology and Clinic Microbiology Ankara University School of Medicine, Turkey. When hybrid capture test was accepted as the golden standard, the sensitivity of RT-PCR was 33%, specificity 100%, false negativity 67%, false positivity 0%, positive predictive value 100%, negative predictive value 74%, and accuracy was 77%. Improving this test by quantification, and application of additional gene transcripts, primarily the late gene transcripts can help increase the sensitivity and feasibility

Detecting of mycoplasma genitallium in male patients with urethritis symptoms in Turkey by polymerase chain reaction

The aim of this study was to investigate the incidence of Mycoplasma genitalium in the urine samples of 63 male patients who had urethritis symptoms. Along with Neisseria gonorrhoeae [N. gonorrhoeae] and Chlamydia trachomatis [C. trachomatis]. We also investigated Mycoplasma hominis [M. hominis] and Ureaplasma urealyticum [U. urealyticum], both of which are known to cause urethritis. Microorganisms were investigated in urine samples of the patients with polymerase chain reaction. The study was conducted between September 2003 - February 2004 at the Department of Microbiology and Clinical Microbiology Ankara University School of Medicine, Ankara, Turkey. A total of 63 urine samples were analyzed and 6 [9.52%] patients had N. gonorrhoeae, 4 [6.34%] had C. trachomatis, while 4 [6.34%] urines were positive in terms of M. genitalium. Nevertheless, 3 [4.76%] patients had U. urealyticum and 2 [3.17%] patients had M. hominis. One urine sample was positive in terms of both N. gonorrhoeae and U. urealyticum, and another urine sample was positive in terms of both M. hominis and U. urealyticum. The results were compared with the control group and found no statistically significant difference. Mycoplasma species are found in normal flora of urogenital system and also as an agent of urogenital infection. In our study, we found low microorganism rates when compared with Europe and America. This difference may be due to the conservative sexual behavior in Turkey