Browsing by Author "Baysallar, Mehmet"

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Arising Prevalence of OXA-48 producer Escherichia coli and OXA-48 with NDM co-producer Klebsiella pneumoniae Strains
(2019) Uskudar-Guclu, Aylin; Guney, Mustafa; Sig, Ali Korhan; Kilic, Selcuk; Baysallar, Mehmet; AAU-6196-2020
Background/aim: This prospective study aimed to determine the presence of the most common carbapenemase genes, blaOXA-48, blaKPC, blaIMP, blaVIM and blaNDM on carbapenem resistant clinical K.pneumoniae and E.coli isolates. Materials and methods: Isolates were selected according to EUCAST guideline; gradient test and disc diffusion with both meropenem and ertapenem discs. Resistance rates of these isolates to other antimicrobial agents were also examined by disc diffusion method. Carbapenem resistance gene were investigated by using Real-Time PCR. Results: A total of 3845 E. coli and 1689 K. pneumoniae isolates from clinical samples between January 2015 and April 2017 were evaluated. The 419 isolates were found as carbapenem resistant but only the first resistant isolate (n=155; 126 K. pneumoniae and 29 E.coli) of each patient were included. Carbapenem resistant isolates were most frequently isolated from intensive care units (48.8%). Colistin was the most effective antibiotic (91.0%). The 121 (78.1%) of the tested isolates were positive for OXA-48 (103 K. pneumoniae and 18 E. coli) and 9 K. pneumoniae carrying blaNDM were also positive for blaOXA-48. VIM, IMP and KPC type carbapenemases were not detected in any isolates. Conclusion: Carbapenem-resistant pathogens have been shown to be able to develop resistance mechanisms with more than one carbapenemase encoding gene.
An Investigation into Bacterial Bloodstream Infections and Antibiotic Resistance Profiles in a Tertiary Hospital for a Ten-Year Period
(2020) Mataj, Valbona; Guney, Mustafa; Sig, Ali Korhan; Uskudar-Guclu, Aylin; Albay, Ali; Bedir, Orhan; Baysallar, Mehmet; 0000-0002-1872-028X; 32776752; AAU-6196-2020
Background: Bloodstream infections are one of the major causes of healthcare-associated morbidity and mortality. The present study aims to investigate the prevalence of the microorganisms isolated from blood cultures and to evaluate susceptibilities to antimicrobial agents in a tertiary center, Gulhane Training and Research Hospital, Ankara, Turkey. Methods: Blood cultures (BCs) were incubated in BACTEC/9050 (Becton Dickinson, USA) (2007 - 2015) and BacT/ALERT (bio-Merieux, France) (2014 - 2016) automated systems. Phoenix (TM) 100 system (Becton Dickinson, USA) (2007 - 2014), MALDI-TOF MS (Bruker, USA) (2015 - 2016) and conventional techniques were used for the identification of isolated microorganisms. According to CLSI (2007 - 2014) and EUCAST (2015 - 2016) criteria, Kirby-Bauer disc diffusion method, Phoenix (TM) system, and broth microdilution were applied for antimicrobial susceptibility testing. Two five-year periods were statistically compared regarding antibiotic resistance. Results: From the overall evaluated 31,380 BCs, 7,367 cultures (23.5%) were positive, excluding 503 BCs (6.4%), which were interpreted as contamination. Of 7,367 isolated microorganisms, 3,680 (50.0%) were gram-negative, 3,303 (44.8%) were gram-positive bacteria, and 384 (5.2%) were fungi. Coagulase-negative staphylococci (CoNS) were predominantly isolated (n = 2,075; 28.2%) among gram-positives. E.coli (n = 978; 13.3%) was the most frequently isolated gram-negative species. Between the first and the last five-year period, three genera (Enterococcus spp., Acinetobacter spp., Streptococcus spp.) showed significant differences when isolated, and only Enterococcus spp. showed increased isolation rates. In total, 90.3% of CoNS and 32% of S. aureus were methicillin-resistant. Only 75 strains of Enterococcus spp. (12.1%) were vancomycin-resistant. ESBL was detected in 40.6% of E. coli and 30.7% of Klebsiella spp. isolates. Carbapenem resistance showed a significant increase, particularly in K. pneumoniae (> 20%). Conclusions: The findings suggest that there was a threatening condition in antimicrobial resistance rates, especially for some antimicrobials between two periods. Although antimicrobial resistance is usually associated with MRSA, carbapenem resistance, ESBL, and VRE, the problem is far beyond these definitions, consisting of not just medicine, but also commercial companies, food industry, veterinarians, and other areas.
Prevalence and Quantity of Parvovirus B19 DNA Among Blood Donors from a Regional Blood Center in Turkey
(2020) Guclu, Aylin Uskudar; Yilmaz, Soner; Baysallar, Mehmet; Avci, Ismail Yasar; 0000-0002-1872-028X; 32439492; AAU-6196-2020
Objective: Parvovirus B19 causes a range of diseases and morbidity in humans and is transmissible by transfusion of blood, blood components and plasma derivatives. The objective of the study was to investigate the prevalence and quantity of B19 DNA among blood donors. Method: Totally 1053 samples were collected from March to July 2016 at a blood bank for detection of Parvovirus B19 DNA and serological status of blood donors. Testing of the presence of viral DNA was performed by a quantitative real-time PCR with a 101 copies/ml detection limit. All DNA positive and randomly selected 267 samples were tested for the presence of anti-B19 IgM and IgG by ELISA. Results: Age distribution of donors was between 18-64; mean age was 27 and median was 23. Among the 1053 samples, 5 (0.47%) had PB19 DNA. All PB19 DNA positive donations had both B19 IgM and IgG antibodies. The DNA level for positive donations were between 0.9 x 102 to 3.1 x 104 copies/ml. IgG and IgM were present in 59.9% (160/267) and 0,74% (2/267) respectively among the healthy donors without PB19 DNA. Conclusion: Detected DNA concentration was less than 105 copies/ml. The presence of IgM in low level PB19 DNA positive donors may indicate that there might be a risk in transmission of PB19 to particularly immunosuppressed recipients. The clinical follow-up of blood donation with low level of PB19DNA should be considered to answer the questions about blood safety.
Prevalence of CMV DNA in Blood Donors in a Regional Blood Center in Turkey
(2022) Uskudar Guclu, Aylin; Yilmaz, Soner; Baysallar, Mehmet; Ayci, Ismail Yasar; 0000-0002-1872-028X; AAU-6196-2020
Cytomegalovirus (CMV) infections with a high seroprevalence rate in adults are often asymptomatic or mild. The current prevalence of CMV DNA in Turkey is not known. This study aimed to find out the prevalence and quantity of CMV DNA in blood donors by PCR. Totally 1003 samples were collected between March and June 2016 at a regional blood bank for detection of CMV DNA in healthy blood donors by quantitative real-time PCR. CMV-DNA positive samples were tested for the presence of anti CMV IgM and IgG by ELISA. Among 1003 donors, 973 (97.01%) were male and 30 (2.99%) were female. Age distribution of donors was between 18-64; mean age was 27. Most of the donors were between 18-30 years old (75.47%) and male (97.01%). One donor was found as CMV DNA positive (0.099%). The DNA quantity for positive donation was 1,75x10(2) IU/ml. CMV DNA positive sample was positive for IgG, whereas negative for IgM. Although the seroprevalence of CMV is high in our country the CMV DNA prevalence was found very low (0.099%). Testing of CMV DNA in blood donation particularly for some specific patient groups and the clinical follow-up of blood donation with low level of CMV DNA should be considered.