Assessing the change in the epidemiology of seasonal respiratory viruses with the onset of the COVID-19 pandemic.

Background. Respiratory tract infections are among the most important causes of mortality and morbidity in children worldwide. The COVID-19 pandemic has affected the distribution of seasonal respiratory viruses as in all areas of life. In this study, we have aimed to evaluate the changes in the rates of seasonal respiratory viruses with the onset of the pandemic.Methods. This study included patients who were admitted to the Pediatrics Clinic of Eskisehir Osmangazi University Faculty of Medicine Hospital between December 2018 and February 2022 with respiratory tract infections and in whom pathogens were detected from nasopharyngeal swab samples analysed by multiplex PCR method.Results. A total of 833 respiratory tract pathogens were detected in 684 cases consisting of male (55.3 %), and female (44.7 %), patients with a total mean age of 42 months. Single pathogen was revealed in 550, and multiple pathogens in 134 cases. Intensive care was needed in 14 % of the cases. Most frequently influenza A/B, rhinovirus and respiratory syncytial virus (RSV) were detected during the pre-pandemic period, while rhinovirus, RSV, and adenovirus were observed during the lockdown period. In the post-lockdown period, the incidence rates of rhinovirus, RSV, human bocavirus (HboV) (12 %), influenza virus infections increased, and patients with RSV and bocavirus infections required intensive care hospitalization.Conclusion. It is thought that the COVID-9 pandemic lockdown measures may have an impact on the distribution of seasonal respiratory viruses, especially RSV and influenza. Current, prospective and large case series regarding the mechanism of action and dynamics are needed.

[Evaluation of the Correlation of HCV Core Antigen Levels with HCV RNA Levels in the Diagnosis and Treatment Follow-up of Hepatitis C Virus Infections]. / Hepatit C Virüs Enfeksiyonlarinin Tani ve Tedavi Izleminde, Hepatit C Virüs Kor Antijen Düzeylerinin Hepatit C Virüs RNA Düzeyleri ile Korelasyonunun Degerlendirilmesi.

Hepatitis C virus (HCV) infections are an important public health issue across the world because of the high risk of chronicity potential, impossibility of protection by vaccination and serious complications such as hepatocellular carcinoma. The aim of this study was to evaluate the correlation of HCV core antigen test with HCV RNA in the diagnosis and treatment follow-up and to discuss the status of being an alternative test in routine use. In the first step of the study, the compatibility of the methods was investigated by applying the HCV core antigen test to 600 serum samples from patients with pre diagnosis of HCV infection for whom anti-HCV and HCV RNA tests were routinely studied in the molecular microbiology laboratory of medical microbiology department between December 2016 and December 2018. In the second step, in addition to the routine HCV RNA test, HCV core antigen test was studied in serum samples taken before the start of the treatment, at the eighth week of the treatment and at the end of the treatment of 150 patients whose treatment were decided by the gastroenterology department within this period. The correlation between the two tests was evaluated during the treatment follow-up. Forty-nine of 600 patients were diagnosed according to test results. In 28 patients, HCV core antigen was positive in addition to HCV RNA and anti-HCV which were routinely studied. The sensitivity of HCV core antigen test was 91.49%, specificity was 100%, PPD was 100%, NPD was 97.30%, accuracy was 87.76%. There was a high correlation between HCV RNA and HCV core antigen results. In the second step of the study, sensitivity (96.52%), specificity (95.28%), PPD (95.11%), NPD (95.80%) and accuracy (92.58%) of the HCV core antigen test were determined. These results show that there is a high correlation between the two tests and that HCV core antigen test can be used as an alternative test to HCV RNA test as it is an easily applicable and cost effective test during diagnosis and treatment follow-up.

Intestinal microbiota composition of children with infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and multisystem inflammatory syndrome (MIS-C).

Microbiota composition may play a role in the development, prognosis, or post-infection of COVID-19. There are studies evaluating the microbiota composition at the time of diagnosis and during the course of COVID-19, especially in adults, while studies in children are limited and no study available in children with multisystem inflammatory syndrome in children (MIS-C). This study was planned to compare intestinal microbiota composition in children diagnosed with MIS-C and acute COVID-19 infection with healthy children. In this prospective multicenter study, 25 children diagnosed with MIS-C, 20 with COVID-19 infection, and 19 healthy children were included. Intestinal microbiota composition was evaluated by 16 s rRNA gene sequencing. We observed changes of diversity, richness, and composition of intestinal microbiota in MIS-C cases compared to COVID-19 cases and in the healthy controls. The Shannon index was higher in the MIS-C group than the healthy controls (p < 0.01). At phylum level, in the MIS-C group, a significantly higher relative abundance of Bacteroidetes and lower abundance of Firmicutes was found compared to the control group. Intestinal microbiota composition changed in MIS-C cases compared to COVID-19 and healthy controls, and Faecalibacterium prausnitzii decreased; Bacteroides uniformis, Bacteroides plebeius, Clostridium ramosum, Eubacterium dolichum, Eggerthella lenta, Bacillus thermoamylovorans, Prevotella tannerae, and Bacteroides coprophilus were dominant in children with MIS-C. At species level, we observed decreased Faecalibacterium prausnitzii, and increased Eubacterium dolichum, Eggerthella lenta, and Bacillus thermoamylovorans in children with MIS-C and increased Bifidobacterium adolescentis and Dorea formicigenerasus in the COVID-19 group. Our study is the first to evaluate the microbiota composition in MIS-C cases. There is a substantial change in the composition of the gut microbiota: (1) reduction of F. prausnitzii in children with MIS-C and COVID-19; (2) an increase of Eggerthella lenta which is related with autoimmunity; and (3) the predominance of E. dolichum is associated with metabolic dysfunctions and obesity in children with MIS-C. CONCLUSIONS:  Alterations of the intestinal microbiota might be part of pathogenesis of predisposing factor for MIS-C. It would be beneficial to conduct more extensive studies on the cause-effect relationship of these changes in microbiota composition and their effects on long-term prognosis. WHAT IS KNOWN: • Microbiota composition may play a role in the development, prognosis, or post-infection of COVID-19.  • However, the number of studies on children is limited, and no study on multisystem inflammatory syndrome in children is currently available (MIS-C). WHAT IS NEW: • In individuals with MIS-C, the composition of the gut microbiota changed dramatically. • Decreased Faecalibacterium prausnitzii have been observed, increased Eggerthella lenta, which was previously linked to autoimmunity, and predominance of Eubacterium dolichum which was linked to metabolic dysfunction and obesity.

Investigation of the relationship of CO-RADS and CT patterns with laboratory parameters in COVID-19 patients and a new perspective on the total CT scoring system.

BACKGROUND: It is important to determine the correlation of the CO-RADS classification and computed tomography (CT) patterns of the lung with laboratory data. To investigate the relationship of CO-RADS categories and CT patterns with laboratory data in patients with a positive RT-PCR test. We also developed a structured total CT scoring system and investigated its correlation with the total CT scoring system. METHOD: The CT examinations of the patients were evaluated in terms of the CO-RADS classification, pattern groups and total CT score. Structured total CT score values were obtained by including the total CT score values and pattern values in a regression analysis. The CT data were compared according to the laboratory data. RESULTS: A total of 198 patients were evaluated. There were significant differences between the CO-RADS groups in terms of age, ICU transfer, oxygen saturation, creatinine, LDH, D-dimer, high-sensitivity cardiac troponin-T (hs-TnT), CRP, structured total CT score values, and total CT score values. A significant difference was also observed between the CT pattern groups and oxygen saturation, creatinine and CRP values. When the structured total CT score values and total CT score values were compared they were observed to be correlated. CONCLUSIONS: Creatinine can be considered as an important marker for the CO-RADS and pattern classifications in lung involvement. LDH can be considered as an important marker of parenchymal involvement, especially bilateral and diffuse involvement. The structured total CT scoring system is a new system that can be used as an alternative.

Investigation of the use of multiplex PCR in childhood diarrhea with clinical and epidemiological features.

INTRODUCTION: Acute gastroenteritis is one of the most common causes of hospital admission in children. Treatment regimens differ depending on the pathogen. In our study, we aimed to evaluate the epidemiological and clinical features of pediatric patients whose gastrointestinal agents were detected by multiplex PCR. MATERIALS AND METHODS: The study included 131 pediatric patients who were followed up at Eskisehir Osmangazi University, Pediatric Department between January 2018 and December 2021.Gastrointestinal pathogens were detected in stool samples by multiplex PCR. The epidemiological and clinical features were reviewed retrospectively. RESULTS: A total of 203 gastrointestinal pathogens were detected from the stool samples of 131 cases. Of these cases, 56% were male and 44% were female. The mean age was 66 (2-204) months. The most common symptoms were diarrhea, fever, vomiting and abdominal pain. The pathogen detection rate was 69% by multiplex PCR. A single pathogen was detected in 85 (65%) cases and multiple pathogens were detected in 46 (35%) cases. The most common pathogens were enteropathogenic Escherichia coli (EPEC, 23%), Clostridium difficile (21%), norovirus (17%), rotavirus (15%), salmonella (12%) and enterotoxigenic E. coli (ETEC, 11%). Stool culture was positive in 16 (12%) cases and microscopic examination positive in 17 (13%) cases. Probiotic treatment was given to 119 (92%) cases and antimicrobial treatment (metroinidazole, ceftriaxone, azithromycin and oral vancomycin) to 34 (26%) cases. Of the cases, 56 (42%) had chronic disease, 40 (30%) had a history of previous antibiotic use and 17 (13%) had a history of hospitalization in the intensive care unit. CONCLUSION: The sensitivity of the multiplex PCR in the detection of acute gastroenteritis agents is higher than stool microscopy, stool culture and stool antigen tests. However, due to the inability to distinguish between colonization, carrier state and pathogenicity, it should be evaluated together with other diagnostic tests and clinical findings in order to determine whether the determined agent is pathogenic or not and in the regulation of antimicrobial therapy.

The Prevalence of Mixed Genotype Infections in Turkish Patients with Hepatitis C: a Multicentered Assessment.

BACKGROUND: HCV virus infections are one of the major health problems in the world that can cause cirrhosis and liver cancer at a higher rate than other hepatitis data. The aim of this study was to determine the prevalence of mixed infections with different HCV genotypes in Turkey and also to evaluate the current HCV genotype and sub-type distributions by a multicentered assessment. METHODS: The HCV genotype data of 17,578 hepatitis C patients collected from 23 centers from different geographic regions covering all Turkey were collected. The data included information about the HCV genotypes in the last 10 years (between 2007 and 2016), demographic properties of the patients and the methods/systems used to determine the genotypes. RESULTS: Two hundred twenty-eight of the patients (1.3%) had mixed genotype. The most common mixed genotype combination was 1b + 4 (0.83%) followed by 1a + 1b (0.26%). Genotype distribution varies according to geographical regions. However, genotype 1 (82.92%) was the most common genotype in all regions and all years. This was followed by genotype 3 (7.07%) and genotype 4 (5.43%). A variety of methods were used by the centers including sequencing, pyrosequencing, real-time PCR, in-house RFLP, reverse hybridization (LIPA), and hybridization. CONCLUSIONS: Infection with mixed HCV genotypes in Turkey is uncommon. Genotype distribution varies according to geographic regions; the most common genotype 1 is encountered all over the country, while genotypes 3 and 4 are only in some of the centers. Since there is limited information about mixed HCV infection, further investigations are needed to determine the clinical importance of mixed HCV infection.

Comparison of Methods Used for the Diagnosis of Epstein-Barr Virus Infections in Children.

The accurate diagnosis of Epstein-Barr virus (EBV) infections is important, as many other infectious agents or diseases can cause similar symptoms. In this study, sera of pediatric patients who were suspected to have an EBV infection, were sent to Eskisehir Osmangazi University Faculty of Medicine, Department of Clinical Microbiology, and investigated by IFA, ELISA, immunoblotting and Real-time PCR. The performances of these tests were compared with IFA. The rates of agreement between ELISA and IFA were found as 100% for seronegative, 100% for acute primary infection, 22.2% for late primary infection, 92.1% for past infection. The rates of agreement between immunoblotting and IFA were found as 80.8% for seronegative, 68.8% for acute primary infection, 55.6% for late primary infection, 86.6% for past infection. The sensitivity of immunoblotting for anti-VCA IgM was identical with ELISA, and higher for anti-VCA IgG, anti-EBNA IgG, anti-EA antibodies, while the specificity of immunoblotting for these antibodies were found to be lower. The sensitivity and specificity of Real-time PCR for detection of viremia in acute primary infection were found as 56.25% (9/16) and 97.89% (139/142), respectively. The diagnostic methods should be chosen by evaluating the demographic characteristics of patients and laboratory conditions together.

[Investigation of human papillomavirus prevalence in women in Eskisehir, Turkey by Pap smear, hybrid capture 2 test and consensus real-time polymerase chain reaction and typing with pyrosequencing method]. / Eskisehir'de kadinlarda insan papillomavirus prevalansinin, Pap yaymasi, hibrid yakalama 2 testi ve konsensus gerçek zamanli polimeraz zincir reaksiyonu ile arastirilmasi ve pirodizileme yöntemiyle tiplendirilmesigi.

Human papillomavirus (HPV) infections have a broad range of clinical spectrum from subclinical or asymptomatic infection to anogenital carcinoma. The detection of HPV-DNA and determination of the risk groups in cervical cancer (CC) screening is very important because CC is considered to be a preventable illness which is the third most common cancer type of women in the world. The aims of this study were to investigate the presence of HPV-DNA in women by two different molecular methods and to compare their results together with the results of cytology, in Eskisehir, Central Anatolia, Turkey. A total of 1081 women aged between 30-65 years, who applied to Eskisehir Early Diagnosis, Screening and Training of Cancer Center (KETEM) for screening were included in the study. Three separate cervical samples were collected simultaneously from the participants for cytologic examination and molecular studies. In the first step of the study, all cervical samples were investigated for the presence of HPV-DNA by Hybrid Capture 2 (HC2; Qiagen, Germany) method. In the second part of the study, consensus real-time polymerase chain reaction (RT-PCR) (Takara Bio Inc., Japan) was performed in 152 samples which included HC2 positive and randomly selected negative samples, and then the HPV genotypes were detected by using a commercial kit based on pyrosequencing method (Diatech Pharmacogenetics S.R.L, Italy). In the first part of the study, HC2 test was found positive in 3% (32/1081) of the women, while in 4.4% (47/1081) Pap smear was positive alone or with HC2 test. Five (0.5%) samples yielded positive results with both of the methods, and four of them were positive for high risk HPV types. Cytology results were negative in 19 out of 23 (23/1081, 2.1%) samples that were reported as high risk HPV by HC2 test. On the other hand, 42 (42/1081, 3.9%) samples that were positive by cytology yielded negative results by HC2 test. In the second part of the study, 32 (21.1%) of 152 selected samples were positive by HC2 test, 40 (26.3%) were positive by Pap smear, and 53 (34.9%) were positive by consensus RT-PCR. All of the 32 samples that were positive by HC2 were also positive by RT-PCR, however 21 samples that were positive by RT-PCR were negative by HC2 test. Among 40 samples that were positive (abnormal) by Pap smear, HPV-DNA was positive in nine (22.5%) by RT-PCR and in five (12.5%) by HC2 test, but HPV-DNA was not detected in 31 (77.5%) samples by both of the tests. Genotyping of the strains could be performed in 44 samples, and the most common type detected was HPV type 16 (n=15, 34.1%), followed by type 90 (n=11, 25%) and type 18 (n= 4, 9.1%). In our study, the sensitivity, specificity, positive and negative predictive values of Pap smear method were estimated as 16.1%, 96%, 10.6% and 97.5%, respectively, based on the HC2 results which was approved by U.S. Food and Drug Administration (FDA). In addition, a significant degree of concordance was detected between HC2 and concensus RT-PCR methods (Cohen's kappa: 0.665). In conclusion, regarding the insufficient number of cytopathologists in our country and according to the recommendations of American Society for Colposcopy and Cervical Pathology (ASCCP) and FDA, it was once again demonstrated that, the implementation of molecular diagnostic methods in addition to the Pap smear for effective screening of CC are needed.

Supporting Clinical Decisions with Rapid Molecular Diagnostic Pneumonia Panel in Pediatric Intensive Care Unit: Single Center Experience in Turkiye.

INTRODUCTION: Lower respiratory tract infections are the leading cause of morbidity and mortality in children worldwide. It is crucial to promptly conduct diagnostic investigations in order to determine the microbiological cause of pneumonia, since this is necessary to ensure the appropriate delivery of antibiotic therapy to each individual patient. We evaluated the results of a rapid molecular diagnostic pneumonia panel in children with LRTI in a pediatric intensive care unit (PICU). PATIENTS AND METHODS: Rapid molecular diagnostic pneumonia panel (BioFire®, FilmArray Pneumonia Panel plus; FA-PP) findings (71 results from 46 children) in a tertiary care PICU between 2019 and 2023 were retrospectively reviewed. RESULTS: At least one bacterial pathogen was detected in 57 cases. A total of 77% of children had underlying conditions. A total of 70.4% of children needed invasive mechanical ventilation and 54.4% had ventilator-associated pneumonia. Pseudomonas aeruginosa (50.8%), Acinetobacter calcoaceticus baumannii complex (42%), and Klebsiella pneumoniae (38.6%) were the most common pathogens detected with the FA-PP. Of the 33 cases diagnosed with VAP, more than one pathogen was identified in 65.9% of cases, with the most commonly identified bacteria being K. pneumoniae (43.1%), P. aeruginosa (38.6%), and Acinetobacter calcoaceticus baumannii complex (31.8%). According to the FA-PP results, the same antibiotic therapy was continued in 39.4% of cases, escalated in 54.5%, and de-escalated in 6.1%. CONCLUSIONS: The utilization of the FA-PP has some beneficial effects, including more prompt delivery of findings compared to conventional approaches. Additionally, this approach enables the identification of resistance profiles in children diagnosed with pneumonia in the PICU. Consequently, these test results facilitate the organization of antibiotic treatment strategies, including escalation and de-escalation approaches. The detection of resistance patterns was exclusively determined via the implementation of molecular testing, prompting a reevaluation of the isolation technique in accordance with the obtained data.

Correlation of Indeterminate Lesions of COVID-19 Pneumonia Detected on Computed Tomography with RT-PCR Results.

BACKGROUND: The typical findings of COVID-19 pneumonia include multilobar groundglass opacities and consolidation areas observed predominantly in the basal and peripheral parts of both lungs in computed tomography. OBJECTIVE: The current study aimed to correlate indeterminate lesions of COVID-19 pneumonia detected on computed tomography with the results of the reverse transcription-polymerase chain reaction (RT-PCR) test. METHODS: Patients with high-resolution computed tomography images that were reported to contain indeterminate lesions in terms of COVID-19 pneumonia were included retrospectively in the study. The lesions were categorized and the patterns were classified. The RT-PCR-positive and the RTPCR- negative patients were compared. P<0.05 was accepted as the statistical significance limit. RESULTS: The RT-PCR-positive patients exhibited a higher rate of peripheral lesions. Limited consolidation areas were not detected in the RT-PCR-positive patients. In the RT-PCR-negative patients, the rates of acinar nodules and the tree-in-bud pattern were significantly higher. The RTPCR- negative patients had higher nodular contour features and lesion coalescence. In the subgroup consisting of lesions with ground-glass opacities and/or ground-glass opacity around the nodule, the rate of nodular contour positivity was significantly higher in the RT-PCR- positive patients. CONCLUSION: COVID-19 pneumonia should be suspected when peripheral indeterminate lesions are detected. When indeterminate lesions, such as tree-in-bud pattern, acinar nodules and limited consolidation area are detected, alternative diagnoses should be considered first, even if there are ground glass opacities accompanying these lesions.

[Investigation of Epstein-Barr virus and herpes simplex virus markers by serological and molecular methods in patients with rheumatoid arthritis and systemic lupus erythematosus]. / Romatoid Artrit ve Sistemik Lupus Eritematozuslu Hastalarda Epstein-Barr Virus ve Herpes Simpleks Virus Göstergelerinin Serolojik ve Moleküler Yöntemlerle Arastirilmasi

Rheumatoid arthritis (RA) and systemic lupus erythematosus (SLE) which are autoimmune diseases usually questioned for their association with many infectious agents have etiopathogenesis related to genetic, immunologic, hormonal and even environmental factors. The most commonly attributed etiologic agents are herpes group viruses. The aim of this study was to investigate the role of Epstein-Barr virus (EBV) and herpes simplex (HSV) viruses in the etiology of RA and SLE. A total of 137 patients (87 RA and 50 SLE; mean age: 33 ± 12 years) who were admitted to Eskisehir Osmangazi University Medical Faculty Rheumatology Department between January 2007-January 2008 and diagnosed according to 1987 ACR (American College of Rheumatology) criteria have been included in the study, together with 50 healthy blood donors (mean age: 35 ± 14 years) as control group. Serum samples obtained from all of the cases were tested for EBV VCA-IgG, VCA-IgM, EA/D-IgG and EBNA-IgG (Trinity Biotech, USA); IgM and IgG antibodies against HSV-1 and HSV-2 by ELISA method (Dia-Pro Diagnostic, Italy), and the presence of viral nucleic acids in blood samples were investigated by real-time quantitative polymerase chain reaction (RTPCR; Qiagen, USA). EBV VCA-IgM was negative in all of the RA, SLE and control group patients. VCA-IgG positivity were 98% and 96%, and for EBNA-IgG 98.5% and 100%, in patient and control groups, respectively. There was no statistically significant difference between the groups regarding VCA-IgG and EBNA- IgG positivity (p> 0.05). On the other hand, EBV EA/D-IgG positivity rate found in the SLE group (34%) was significantly higher than RA (7%) and control (12%) groups (p< 0.001 and p< 0.05, respectively). There was no significant difference between RA and control groups in terms of EA/D-IgG positivity (p> 0.05). Regarding herpes simplex virus serology, HSV1-IgG seropositivity were 99% and 94% and HSV2-IgG positivity were 8% and 12% in the patient and control groups, respectively. There was no statistically significant difference between the groups according to the positivity rates of IgM and IgG specific for HSV-1 and HSV-2 (p> 0.05). All of the cases were found negative in terms of EBV, HSV-1 and HSV- 2 DNAs according to double-checked RT-PCR results. In conclusion, no significant difference was determined for EBV and HSV serologic markers in RA and SLE patients compared to the control group. However, significantly higher rate of EBV EA/D-IgG positivity in SLE patients might have indicated a possible association between SLE and EBV infection. Larger scale, prospective studies including examination of the synovial fluid/tissue samples are required to enlighten the association between SLE and EBV.

Assessment of respiratory tract viruses in febrile neutropenic etiology in children and comparison with healthy children with upper/lower respiratory tract infection.

OBJECTIVE: This study aims to compare the frequency of respiratory viruses using real-time and multiplex polymerase chain reaction technology and nasopharyngeal swabs taken during exacerbation of patients aged 0-18 years followed for febrile neutropenia (FN) with non-FN children. METHODS: This prospective study included a total of 40 patients with FN and malignancies followed at Eskisehir Osmangazi University, Department of Pediatric Hematology and Oncology. The control group (n=76) consisted of age-matched patients with upper respiratory tract infections (URTIs) or lower respiratory tract infections (LRTIs) who were admitted to the emergency service due to fever. RESULTS: Viral agents were detected in 16 of 53 FN attacks (30.1%). The most commonly isolated viruses were coronavirus (23.7%, n=9), influenza B (18.4%, n=7), and adenovirus (18.4%, n=7). Of 76 children diagnosed with URTI with fever (52.6%) had viral agents, and only 28 of them had a single agent. The most commonly isolated virus was adenovirus (28.6%, n=14). Viral factors were found in 32 of 42 patients (76.1%) patients diagnosed with LRTI, while respiratory syncytial virus was the most common virus in 27 patients (21.7%, n=5). CONCLUSION: Our study results show that viral agents play an important role in the etiology of FN. This is the first study to show that viral agents play an important role in the etiology of this disease and viral factors in non-neutropenic febrile children at the same time period by detecting respiratory viruses in 30% of FN cases. More similar studies provide antiviral therapy in selected patients, as well as these studies lead to reduce the use of antimicrobial agents or allow more selective use of antibiotics and/or the earlier discontinuation of these antibiotics in febrile neutropenic children who have been shown to have viral cause of respiratory tract infection based on clinical and microbiological/molecular diagnostic criteria.

Immune response after a single vaccination against 2009 influenza A H1N1 in hemodialysis patients.

BACKGROUND: Influenza infection is a significant cause of morbidity and mortality in general population. Hemodialysis patients are considered at high risk of influenza infection given their altered immune status. Pandemic influenza virus is new for human beings, so it is hard to predict the response to infection or vaccination. We aimed to evaluate the response to pandemic H1N1 vaccination in hemodialysis patients. METHODS: A total of 70 patients on chronic hemodialysis and 20 controls who had been vaccinated against the pandemic influenza virus 5 weeks before the time of blood sampling were included into this study. The anti-H1N1 immunoglobulin G (IgG) antibodies of the patients were studied with enzyme immune assay (EIA) method. Our cut-off optical density (OD) value was 1.503. If the patient's OD value was equal or higher than this value, it was considered as positive. If it was lower, it was considered as negative. RESULTS: The mean OD value was 2.22 +/- 0.42 in the patient group and 1.99 +/- 0.34 in the control group (p < 0.05). Two of 70 patients and 1 of the controls had negative OD values and they were considered as nonresponsive to vaccination. There was also a negative correlation between the age and OD values in the patient group (r = -0.277, p < 0.05). CONCLUSION: H1N1 vaccine can be performed safely and cost effectively with a single dose to the risk groups especially to the hemodialysis patients. Evaluation of H1N1 IgG antibody with enzyme-linked immunosorbent assay (ELISA) may be a safe, easy, and cost-effective assay.

[Investigation of mupirocin resistance in nosocomial methicillin-resistant Staphylococcus aureus isolates by phenotypic and genotypic methods]. / Nozokomiyal kökenli metisiline dirençli Staphylococcus aureus izolatlarinda mupirosin direncinin fenotipik ve genotipik yöntemlerle arastirilmasi.

Since methicillin-resistant Staphylococcus aureus (MRSA) has become one of the most prevalent nosocomial pathogens and a frequent cause of mortality and morbidity, there is an increasing tendency to use topical mupirocin for eradication of MRSA carriage. However, there have been recent reports of resistance against mupirocin among MRSA isolates. This study was conducted to investigate the presence of mupirocin resistance in a population of 595 nosocomial MRSA isolates by phenotypic and genotypic methods. In 35 (5.9%) of 595 isolates, mupirocin resistance was detected by disc diffusion and E-test methods. High-level mupirocin resistance was detected in 23 (65.8%) isolates and low-level mupirocin resistance in 12 (34.2%) isolates by E-test method. The molecular analysis of 35 mupirocin resistant MRSA isolates showed the presence of both mecA and mupA genes by polymerase chain reaction. While in 23 high-level mupirocin resistant MRSA isolates a 38 kb plasmid was detected, none of the low-level mupirocin-resistant MRSA isolates revealed the presence of this plasmid. Thirty-two of 35 mupirocin resistant MRSA isolates were genotyped with pulsed-field gel electrophoresis and 24 isolates were typed as identical (genotype A) and 8 as genetically-related (genotype A1), according to Tenover criteria. These data revealed that mupirocin resistant MRSA isolates in our hospital were of the same genotype or closely related.

The investigation of parvovirus B19 infection in patients with haematological disorders by using PCR and ELISA techniques.

Parvovirus B19 has a marked tropism for erythroid progenitor cells. This may lead to chronic anemia in predisposed individuals. The purpose of the study was to investigate the frequency of parvovirus B19 infections in patients with diagnosis of haematological disorders. In order to determine the diagnostic use of different markers of parvovirus B19 infection, serum specimens obtained from 79 patients with haematological disorders were tested for specific antibodies and viral DNA through the use of ELISA and PCR techniques. Evidence of parvovirus B19 infection was found in 23/79 (29.1%) patients by demonstrating viral DNA and/or specific IgM antibody. B19 infection was established in 3 of 11 patients with chronic myeloid leukemia, in 3 of 11 acute myeloid leukemia, in 2 of 11 patients with multiple myeloma, in 3 of 8 patients with Hodgkin's lymphoma, in 5 of 10 patients with non-Hodgkin's lymphoma, in 1 of 6 patients with myelodysplastic syndrome, in 4 of 11 patients with chronic lymphocytic leukemia, and in 2 of 11 patients with acute lymphocytic leukemia. In 4 of 23 positive patients, only parvovirus B19 DNA could be detected, while 7 patients were tested positive for both parvovirus B19 DNA and specific IgM. Nine patients were tested positive for both B19 DNA and specific IgG. In the remaining 3 positive patients only specific IgM could be detected. Due to the discrepancies between DNA and IgM results, the diagnostic procedures should include a search for specific DNA by PCR methods if specific IgM has been found to be negative.

[Comparison of hepatitis C virus (HCV) RNA and anti-HCV results and evaluation of the relationship between transaminase levels]. / Hepatit C virus (HCV) RNA ve anti-HCV sonuçlarinin karsilastirilmasi ve transaminaz düzeyleriyle iliskilerinin degerlendirilmesi.

In this retrospective study, the data of hepatitis C virus (HCV) markers (anti-HCV and HCV-RNA) obtained from the patients who were prediagnosed and/or diagnosed as HCV infection have been comparatively evaluated and the relationship between these markers and transaminase (ALT and AST) levels have been analysed. A total of 690 sera from patients who were followed-up between January 2002 to December 2004 in Eskisehir Osmangazi University Medical Faculty Hospital were included to the study. Anti-HCV (Axsym System HCV version 3.0, Abbott Laboratories, USA) and HCV-RNA (Real-time Taqman Technology, Roboscreen kit and ABI Prism 7700 Perkin Elmer) tests were studied simultaneously and the results were examined together with the levels of ALT and AST of patients. In our study group, 455 (65.9%) of 690 samples were found positive for anti-HCV, while 235 (34.1%) were negative. Of anti-HCV positive patients, 51.6% (235/455) yielded positive and 48.4% (220/455) yielded negative results for HCV-RNA. The rate of anti-HCV negative but HCV-RNA positive sera was detected as 8.5% (20/235). When liver enzyme levels were taken into consideration, of 690 sera 338 (49%) showed normal transaminase levels, while 352 (51%) had elevated ALT and/or AST levels (23 with increased AST, 57 with increased ALT, and 272 with increased ALT and AST). Of the patients who exhibited increased ALT+AST levels (n=272), 50% were found positive for both markers (anti-HCV and HCV-RNA), 17% were only positive for anti-HCV, 3.6% were only positive for HCV-RNA, and 29% were negative for both markers. As a result, since anti-HCV negativity may be detected in viremic patients, molecular methods should be applied especially for the diagnosis of suspected cases and cases without seroconversion.

Anti-cyclic citrullinated peptide (CCP) antibodies in patients with long-standing rheumatoid arthritis and their relationship with extra-articular manifestations.

OBJECTIVES: To evaluate frequency of anti-cyclic citrullinated peptide antibodies (anti-CCP) in long-standing rheumatoid arthritis (LsRA) patients and their relationship with extra-articular manifestations of rheumatoid arthritis (RA), in addition to comparing frequency of anti-CCP antibodies in early RA (ERA) and LsRA group. DESIGN AND METHODS: One hundred and fifteen consecutive RA patients were included in the study as having LsRA because their disease duration was longer than 3 years. Thirty-nine consecutive patients with RA were included in the study as having ERA (<3 years). Also, 64 individuals were included in the study as healthy controls to verify the specificity and sensitivity of anti-CCP antibodies. Anti-CCP antibody and rheumatoid factor (RF) were evaluated with enzyme-linked immunosorbent assay kits and standard nephelometry methods, respectively. Extra-articular manifestations were diagnosed by relevant criteria. RESULTS: The total number of patients with extra-articular manifestations was found to be 45 (39%). No significant difference was found between LsRA group and ERA group in terms of extra-articular manifestations. There were no differences between both groups regarding the number of patients with positive anti-CCP antibodies and the levels of anti-CCP antibodies. In LsRA group, there was a positive correlation between erosion and disease duration (r=0.24, p<0.01), between erosion and RF (r=0.29, p<0.002), and between erosion and anti-CCP antibody (r=0.21, p<0.02). Positive correlations between RF and anti-CCP antibody (r=0.32, p<0.0001), as well as between subcutaneous nodule and lung involvement (r=0.24, p<0.008), were found in the LsRA group. However, no positive correlation could be found between anti-CCP antibody positivity and extra-articular organ involvement, either cumulatively or separately. CONCLUSIONS: Although anti-CCP antibodies are associated with the severity of the disease and erosion, they do not seem to have much linkage with extra-articular manifestations of RA.

[Investigation of TT virus-DNA in multitransfused children and healthy children]. / Cok sayida transfüzyon alan Cocuklar ile saglikli cocuklarda tt virus-DNA varliginin arastirilmasi.

TT virus (TTV) is a naked, single stranded DNA virus, which has been discovered in the serum of a patient with posttransfusion hepatitis of unknown etiology. TTV is widespread in the population, however, the mode of its transmission is unclear. This study was conducted to search for TTV-DNA positivity rates and its relationship with the clinical outcomes of recipients who underwent multiple blood or blood product transfusion, together with healthy children. TTV-DNA was investigated in 52 multitransfused pediatric patients (age range: 3 mnths - 17.5 yrs, mean age: 9.2 +/- 5.7 years) and 18 healthy children (age range: 1 mnth - 16.5 yrs, mean age: 8.1 +/- 4.9 years), by qualitative in-house semi-nested polymerase chain reaction (PCR) with the primers NG059, NG061 and NG063, generated from ORF1 region of the viral genome. TTV-DNA was found positive in 30.8% of multitransfused, and 16.7% of healthy children. The differences of TTV-DNA positivity rates between the multitransfused and control groups, and ALT values between the patients with positive and negative TTV-DNA, were statistically insignificant (p>0.05). As a result, no relationship was detected between TTV positivity and hepatitis, although there was a statistically insignificant increase of TTV-DNA positivity in multitransfused children. However, since the primers of ORF1 N22 region used in our PCR method did not have enough sensitivity for the detection of TTV-DNA, it has been concluded that more sensitive primers such as UTR primers, should be used for more reliable evaluation of the results.

Cigarette smoking increases plasma concentrations of vascular cell adhesion molecule-1 in patients with coronary artery disease.

Cigarette smoking adversely affects endothelial function and increases risk of coronary artery disease (CAD). The pathogenesis of coronary atherosclerosis is currently thought to involve interactions between inflammatory cells and vascular endothelium. Adhesion molecules play a pivotal role in the accumulation of inflammatory cells at the endothelium. Little is known about the role of cigarette smoking in this atherosclerotic inflammatory process. The aim of this study was to evaluate the effects of cigarette smoking on the plasma concentrations of soluble vascular cell adhesion molecule-1 (VCAM-1) in patients with CAD. The soluble VCAM-1 level was quantified in smoking CAD patients (n = 19) in comparison to those from patients with CAD alone (n = 10). Plasma concentrations of soluble VCAM-1 were measured by enzyme-linked immunosorbent assay. The soluble VCAM-1 level was found significantly higher in smokers than in nonsmokers (32.1279 +/- 21.6421 vs 9.4570 +/- 7.8138 ng/mL, p < 0.01), and in patients with previous myocardial infarction (MI) than in those without previous MI, but not significant statistically (27.7279 +/- 22.8813 vs 17.8170 +/- 15.9172 ng/mL, p > 0.05). No significant difference was observed for soluble VCAM-1 levels between hypertensive and nonhypertensive patients, multivessel and one-vessel disease, or anterior and inferior MI localizations. The present study suggests that in patients with CAD, smoking leads to elevated levels of soluble VCAM-1 that may clarify one of the mechanisms of its accelerating effect on the atherosclerotic process.