Mikrobiyoloji bulteni最新文献

{"title":"[The Wolf in Sheep's Clothing Leishmania tropica: Two Pediatric Visceral Cases].","authors":"Hüseyin Gülen, Ayşen Türedi Yıldırım, İbrahim Çavuş, Hülya Türkmen, Ezgi Özgüven, Ahmet Özbilgin","doi":"10.5578/mb.202497101","DOIUrl":"https://doi.org/10.5578/mb.202497101","url":null,"abstract":"<p><p>According to the World Health Organization (WHO), leishmaniasis is a zoonotic/anthroponotic parasitic disease endemic in 99 countries. It is estimated that approximately 12 million people are infected with Leishmania spp. and 350 million people live at risk. Every year, two million new cases are added to these figures. One and a half million cases of zoonotic/anthroponotic cutaneous leishmaniasis and 500 000 cases of visceral leishmaniasis are reported annually. One person is estimated to to be infected with cutaneous leishmaniasis in every 20 seconds and visceral leishmaniasis causes 60 000 deaths. In this report, two pediatric cases diagnosed with visceral leishmaniasis were presented. In the study, bone marrow aspirations were performed to determine the etiology of the disease in an eight-month-old male patient with fever and hepatosplenomegaly who had been followed up in Manisa Celal Bayar University, Department of Pediatrics, Division of Pediatric Hematology with the diagnosis of severe glucose-6-phosphate dehydrogenase (G-6PD) deficiency since the neonatal period and in a nine-month-old female patient who had had a high fever and bicytopenia for two weeks. Bone marrow aspirations were cultured in NNN medium and their smears were stained and examined with Giemsa. rk-39 and Leishmania IFAT tests were performed by using patients' sera. Quantitative reverse transcriptase polymerase chain reaction (RT-qPCR) analysis was also performed for Leishmania spp. Leishmania spp. amastigotes were observed in Giemsa-stained smear preparations, Leishmania spp. promastigotes were grown in NNN medium, rk39 rapid diagnostic kit was weakly positive, Leishmania IFAT was positive at a titer of 1/1024 and Leishmania tropica was identified as the causative agent by RT-qPCR analysis for both cases. These two cases suggested that fatal cases of visceral leishmaniasis may increase with the spread of visceralized isolates of L.tropica, the most common causative agent of cutaneous leishmaniasis in Türkiye, and this issue may create a significant public health problem.</p>","PeriodicalId":18509,"journal":{"name":"Mikrobiyoloji bulteni","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141752139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Comparison of Cytomegalovirus Polymerase Chain Reaction Test Results Obtained with Fully Automated Systems: Roche Cobas 6800 and Qiagen NeuMoDx Experience].","authors":"Tuğba Bozdemir, Aylin Erman Daloğlu, Dilek Çolak, Nazlı Gürkan, Gözde Öngüt, Derya Mutlu","doi":"10.5578/mb.20249727","DOIUrl":"https://doi.org/10.5578/mb.20249727","url":null,"abstract":"<p><p>Viral load monitoring is important in identifying patients at risk of developing cytomegalovirus (CMV) related complications after transplantation and for this purpose, quantitative real-time polymerase chain reaction (Rt-qPCR) tests are most commonly used. The main problem in CMV DNA Rt-qPCR tests that make quantitative measurements is that there are significant differences in measurements performed with different kits in different laboratories. Comparability of viral load measurements between laboratories has increased with the introduction of quantitative PCR tests calibrated with the CMV International Quantitation Standard (IQS) developed by the World Health Organization (WHO). However, quantitative agreement between measurements made with different kits has still not been fully achieved. In this study, it was aimed to investigate the quantitative compatibility between measurements made with Cobas 6800 (Roche Diagnostics, Mannheim, Germany) and NeuMoDx (Qiagen, Ann Arbor, USA) CMV DNA Rt-qPCR tests, which are fully automated new generation systems calibrated with the WHO CMV IQS. The results of 214 plasma samples, which were studied simultaneously with Cobas 6800 CMV Rt-qPCR and NeuMoDx CMV Rt-qPCR tests were analyzed. In the tests, the extraction, amplification and detection stages were carried out fully automatically. CMV DNA was detected in 144 (67.28%) samples in both tests and was not detected in 53 (24.76%) samples. Incompatible results were obtained in a total of 17 (7.94%) samples. Good agreement was found between the qualitative results of both tests (kappa= 0.80, p< 0.001). When the quantitative results (n= 129) obtained in the dynamic measurement range of both tests were examined, the median viral load values measured by Cobas 6800 CMV Rt-qPCR and NeuMoDx CMV Rt-qPCR tests were 513 IU/mL (range= 35-37000) and 741 IU/mL (range= 68-48978), respectively. According to the correlation analysis, a very strong correlation was found between the results of both tests (r= 0.94, p< 0.001). According to Bland-Altman analysis; the average difference between the results of the NeuMoDx CMV Rt-qPCR test and the Cobas 6800 CMV Rt-qPCR test was found to be -0.14 log10 [standard deviation (SD)= 0.23] IU/mL and it was determined that the Cobas 6800 CMV Rt-qPCR test had lower measurements than the NeuMoDx CMV Rt-qPCR test. In 120 of 129 samples (93%) whose results were within the dynamic measurement range of both tests, the measurement difference was within ± 0.5 log10 IU/mL and in 9 (7%), it was detected as more than ± 0.5 log10 (median 0.54 log10 IU/ml; range= 0.51-0.81). No measurement difference of more than ± 1.0 log10 was detected in any sample. In this study, quantitative agreement was found in the measurements made in plasma samples with the fully automated Cobas 6800 CMV Rt-qPCR and NeuMoDx CMV Rt-qPCR tests calibrated with the CMV IQS. To the best of our knowledge, a study comparing viral load measurements made with Cobas 6800 and NeuMo","PeriodicalId":18509,"journal":{"name":"Mikrobiyoloji bulteni","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141752132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Evaluation of the Bio-Speedy Meningitis/Encephalitis Panel in the Diagnosis of Central Nervous System Infections].","authors":"Osman Merdan, İmran Sağlık, Fatma Dilşad Aksoy, Uğur Önal, Cüneyt Özakın, Mustafa Kemal Hacımustafaoğlu, Solmaz Çelebi, Harun Ağca, Mehmet Tekinsoy, Beyza Ener","doi":"10.5578/mb.202497189","DOIUrl":"https://doi.org/10.5578/mb.202497189","url":null,"abstract":"<p><p>Infections of the central nervous system (CNS) can lead to severe outcomes if not accurately diagnosed and treated. The broad spectrum of pathogens involved in CNS infections can make diagnosis challenging. Polymerase chain reaction (PCR) -based multiplex molecular diagnostic panels can rapidly and simultaneously detect multiple neuropathogens in cerebrospinal fluid (CSF). This study was aimed to assess the Bio-Speedy Meningitis/Encephalitis RT-PCR MX-17 panel (Bioeksen, İstanbul, Türkiye), a novel multiplex PCR test, in diagnosing CNS infections. The panel can detect a range of pathogens, including Escherichia coli K1, Haemophilus influenzae, Listeria monocytogenes, Neisseria meningitidis, Streptococcus pneumoniae, Streptococcus agalactiae, enterovirus (EV), herpes simplex virus (HSV) 1 and 2, HHV-6, HHV-7, HHV-8, human parechovirus (HPeV), varicella zoster virus (VZV), cytomegalovirus (CMV) and Cryptococcus gatti/neoformans in CSF samples. This retrospective study included 128 CSF samples from 128 patients sent to Bursa Uludağ University Health Application and Research Center Microbiology Laboratory between June 2022 and July 2023 to search for CNS infectious agents. Patient clinical, radiological and laboratory data were collected from the Hospital Information Record System (HIRS). Bacterial pathogens were identified through culture, while viral pathogens were detected in CSF samples using the Fast Track Diagnostics (FTD) multiplex RT-PCR panel (Fast Track Diagnostics Ltd., Luxembourg) for HSV-1, HSV-2, VZV, EV, mumps virus and HPeV. The stored CSF samples were then tested using the BioSpeedy panel and the results were compared with those of the culture and the FTD panel. Pathogens that were detected were considered positive if they were consistent with the patient's symptoms and CSF characteristics according to infectious disease and pediatric infectious disease specialists. Pathogens detected but not supported by the patient's symptoms and CSF characteristics were classified as uncertain clinical relevance (UCR). Out of the 128 patients tested for CNS infectious agents, 44 (34.4%) were diagnosed with a CNS infection. The overall pathogen detection rate with all methods was 43.2% (19/44). The Bio-Speedy panel identified pathogens in 29.5% (13/44) of the patients, followed by the FTD panel (20.5%, 9/44) and culture (9.1%, 4/44). Four bacteria were identified with culture, three of which were also detected by the Bio-Speedy panel. Additionally, six bacteria were identified with Bio-Speedy panel, that were not identified by culture. The FTD panel identified nine viruses, four of which were also identified by Bio-Speedy. In total, the Bio-Speedy panel detected 13 of the 19 positive pathogens (nine bacteria and four viruses: [S.pneumoniae (n= 3), VZV (n= 3), N.meningitidis (n= 2), H.influenzae (n= 2), L.monocytogenes (n= 1), E.coli (n= 1) ve EV (n= 1)]. However, the Bio-Speedy panel identified 15 pathogens [S.pneumoniae (n= 1), E.coli (n= 1)","PeriodicalId":18509,"journal":{"name":"Mikrobiyoloji bulteni","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141752134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Seroprevalence and Risk Factors of Hepatitis B, C and D in Adults in Trabzon, Türkiye].","authors":"Cevriye Ceyda Kolaylı, Murat Topbaş, Esra Özkaya, İftihar Köksal, Nazım Ercüment Beyhun, Neşe Kaklıkkaya, Gamze Çan, Mustafa Yılmaz, Köksal Hamzaoğlu, Esin Sayın, Serdar Karakullukçu","doi":"10.5578/mb.20249762","DOIUrl":"https://doi.org/10.5578/mb.20249762","url":null,"abstract":"<p><p>Viral hepatitis are infections that can cause liver damage, become chronic, lead to cirrhosis, hepatocellular carcinoma and ultimately result in death due to their ability to spread in the community through blood and infected body fluids. The aim of this study was to determine the seroprevalence of hepatitis B (HBV), hepatitis C (HCV), and hepatitis D (HDV) transmitted through blood among individuals living in Trabzon province and to examine the factors potentially associated with seroprevalence. This cross-sectional study was conducted in Trabzon province, located in the northeast of Türkiye, including a total of 10 districts, including the central district. Since seroprevalence was calculated for HBV, HCV, and HDV in the study, the sample size was separately calculated for each, and the calculated maximum sample size of 1116 was accepted as the minimum sample size for the study. The study was completed with 1502 participants. Serological tests for HBV included HBsAg, anti-HBs, and anti-HBc IgG; for HCV, anti-HCV; and for HDV, anti-HDV were analysed. Data were evaluated for HBV risk factors using univariate analyses with Chi-square test and for multiple analyses using enter model logistic regression analysis. The mean age of the participants was 45.7 ± 16.6 years, with 767 (51.1%) being female. The prevalence of HBV seropositivity, indicating vaccination, was 23.0%, while the seroprevalence of HBV among unvaccinated adults was 27.4%. HBsAg positivity was 5.1%, and isolated anti-HBc IgG positivity was 4.2%. The proportion of individuals with HBsAg in the gray zone was 0.5%, while the positivity rates for anti-HBs and anti-HBc IgG (indicating past infection) were 17.6%. The prevalence of anti-HCV was six per thousand, while anti-HDV was not detected in the analyses. HBsAg positivity and co-infection with HCV were found in one person, and among the nine individuals positive for anti-HCV, isolated anti-HBc IgG positivity was detected in three. Increasing age, presence of a person with jaundice in the family, presence of diabetes mellitus, alcohol use and cupping therapy were identified as risk factors for HBV in the logistic regression analysis. Risk factors for HCV in univariate analyses were being over 40 years old, presence of hepatic steatosis and receiving dialysis treatment. The results of the study indicate that despite being included in our vaccination schedule and the administration of vaccines to high-risk adults, HBV still requires intensive attention as a public health problem. HCV, lacking a vaccine has been evaluated as an infectious agent that needs to be taken into consideration due to its potential risks and requires the complete implementation of individual and social precautions.</p>","PeriodicalId":18509,"journal":{"name":"Mikrobiyoloji bulteni","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141752138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Effect of Quorum Sensing Systems on Biofilm Formation and Virulence in Salmonella].","authors":"Ebru Öztaş Gülmüş, Nefise Akçelik, Caner Özdemir, Mustafa Akçelik","doi":"10.5578/mb.20240038","DOIUrl":"https://doi.org/10.5578/mb.20240038","url":null,"abstract":"<p><p>In recent years, as the paradigm of communication between cells has been clarified, the ability of bacteria to change their gene expression patterns in response to various extracellular signals has attracted great interest. In particular, intracellular and intercellular communication between bacterial populations, called quorum sensing (QS), is essential for coordinating physiological and genetic activities. QS studies are critical, particularly in elucidating the regulatory mechanisms of infectious processes in food-borne pathogens. Elucidating the QS mechanisms in Salmonella is effective in silencing the virulence factors in the fight against this bacterium. The aims of this study were; to create luxS gene mutants that play a vital role in the QS activity of Salmonella and to determine the effect of this mutation on the expression of virulence genes in the bacteria and to determine the impact of synthetic N-hexanoyl-homoserine lactone (C6HSL) on biofilm formation and AI-2 signaling pathway of Salmonella wild strain and luxS gene mutants. luxS gene mutants were constructed by recombining the gene region with the chloramphenicol gene cassette based on homologous region recombination. In the luxS mutants obtained in this way, the expression of eight different virulence genes (hilA, invA, inv, glgC, fimF, fliF, lpfA, gyrA), which have essential roles in Salmonella pathogenicity, was determined by quantitative real-time reverse transcriptase polymerase chain reaction (rRT-qPCR) method and compared with natural strains. As a result of these studies, it was determined that the expression of each gene examined was significantly reduced in luxS mutant strains. The relative AI-2 activities of Salmonella strains were analyzed depending on time. It was determined that the highest activity occurred at the fourth hour and the AI-2 activities of luxS mutants were reduced compared to the wild strain. Finally, it was determined that C6HSL increased the biofilm activity of Salmonella Typhimurium DMC4, SL1344 wild strains, and mutants, mainly at the 72nd hour. In conclusion, our results proved that C6HSL stimulated QS communication in all strains and increased biofilm of Salmonella formation and autoinducer activity. This situation determines that Salmonella responds to external signals by using QS systems. In addition, this research contributed to provide additional information on interspecies communication mechanisms to develop strategies to prevent biofilm formation of this pathogen.</p>","PeriodicalId":18509,"journal":{"name":"Mikrobiyoloji bulteni","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141752133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Investigation of Biofilm Formation, Anti-Quorum Sensing Activity and Antimicrobial Resistance in Corynebacterium Species Isolated from Clinical Samples].","authors":"Banu Hümeyra Keskin, İdris Şahin, Gözde Kahraman, Pelin Kamuran Duran, Görkem Dülger, Mehmet Akif Durmuş, Ayşe Nur Ceylan, Emel Çalışkan, Şükrü Öksüz","doi":"10.5578/mb.20249704","DOIUrl":"https://doi.org/10.5578/mb.20249704","url":null,"abstract":"<p><p>An increasing number of different clinical infections caused by Corynebacteria have been reported in the last decade. The aim of this study was to evaluate the antibiotic resistance rates, biofilm formation capacities and to investigate the ''anti-quorum-sensing (anti-QS)'' activities of corynebacteria, which were divided into three groups according to the type of growth in culture (pure, with another pathogenic bacterium and polymicrobial growth). In total 240 Corynebacterium spp. isolates from different clinical specimens sent to the medical microbiology laboratories of Düzce University Faculty of Medicine Hospital and Başakşehir Çam and Sakura City Hospital between June 2021 and June 2022 were classified into three groups: pure, isolated with another pathogen and polymicrobial, according to their growth patterns in culture. Bacteria were identified by matrix assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) Biotyper (Bruker, Germany) at an external centre. Antibiotic susceptibilities were determined by disc diffusion method and for vancomycin broth microdilution method was used. Results were interpreted according to EUCAST recommendations. The biofilm-forming properties of the isolates were determined quantitatively. Bioactive components of 17 isolates with strong biofilm formation were extracted and anti-QS activity was determined by agar diffusion method using Chromobacterium violaceum ATCC 12472 strain and then violacein pigment production was measured quantitatively. Of the 240 Corynebacterium spp. isolates, 138 (58%) were pure, 52 (22%) were isolated with another pathogen and 50 (20%) were part of a polymicrobial infection. Of the isolates, 140 were identified as C.striatum, 34 as C.amycolatum and 24 as Corynebacterium afermentans. When the antibiotic resistance rates of the Corynebacterium isolates were analysed according to the groups, the resistance rates to rifampicin and tetracycline antibiotics were found to be statistically significantly lower in the polymicrobial group than in the other groups. The resistance rates to penicillin, clindamycin, ciprofloxacin, moxifloxacin, rifampicin, tetracycline and linezolid were 96.7%, 88.3%, 86.3%, 73.8%, 62.5%, 59.2% and 0.8%, respectively. While all isolates were susceptible to vancomycin, linezolid resistance was detected in two C.afermentans isolates. When the biofilm formation ability was analysed, it was observed that 87 (36.3%) isolates formed biofilm. The biofilm formation rate of the isolates in the polymicrobial growth group was lower than the other two groups. The anti-QS activity of 17 isolates with strong biofilm formation was investigated and none of the Corynebacterium extracts tested were found to have anti-QS activity (inhibition of violacein pigment production without inhibiting bacterial growth) in the QS study with C.violaceum, whereas five isolate extracts had antibacterial activity (inhibition of bacterial growth). Four of the bacte","PeriodicalId":18509,"journal":{"name":"Mikrobiyoloji bulteni","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141752136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Aspergillus flavus/oryzae Arthritis of the Knee Joint: First Case in Türkiye].","authors":"Selda Kömeç, İlgin Özden","doi":"10.5578/mb.20249702","DOIUrl":"https://doi.org/10.5578/mb.20249702","url":null,"abstract":"<p><p>Aspergillus species are common hyphal fungi. In addition to allergies and mycotoxicosis, Aspergillus species can cause various infections known as aspergillosis. Aspergillosis of the respiratory tract, central nervous system, skin and soft tissues is well described. However, musculoskeletal infections due to invasive aspergillosis are not well described. Fungal joint infection due to invasive aspergillosis is a rare form of septic arthritis. In this case report, a patient who admitted to our hospital for liver transplantation and developed knee joint arthritis caused by Aspergillus flavus/Aspergillus oryzae during this process was presented. A 28-year-old male patient with autoimmune hepatitis was admitted to hospital with decompensated liver cirrhosis and encephalopathy. The patient, who was awaiting an emergency liver transplant, developed pain, swelling and limitation of movement in his right knee and appropriate consultations and tests were requested. Three joint fluid cultures taken one day apart and nine days later were positive for fungal growth. Macroscopic examination of the mould growth and microscopic examination with lactophenol cotton blue suggested a species belonging to the A.flavus complex and the isolate was identified as A.flavus/A.oryzae by matrix-assisted laser desorption/ionisation mass spectrometry (MALDI-TOF MS) (EXS 2600, Zybio, China). As a result of ITS gene sequencing, the species was determined to be A.oryzae. As cases have been reported where A.flavus and A.oryzae species could not be distinguished by ITS gene sequencing, the pathogen was defined as A.flavus/oryzae. The patient died of liver disease during treatment with amphotericin B. There are few cases of arthritis caused by Aspergillus species in the literature. Aspergillus species found in joint infections are, Aspergillus fumigatus, A.flavus, Aspergillus niger and Aspergillus terreus species complexes, in order of frequency. A.flavus and A.oryzae are closely related. They are difficult to distinguish by conventional methods, MALDI-TOF MS or ITS region sequencing, which is commonly used for genus/species identification in fungi. The number of Aspergillus arthritis cases is low and the identification methods applied to the species reported as causative agents in most studies can identify at the species complex level. In addition, it can be assumed that species not previously reported as causative agents may be encountered as a result of developments in identification methods. In the few publications in the literature where A.flavus complex was reported as the causative agent of joint infections, it seems possible that some of the agents may be A.flavus and some may be A.oryzae, since the agents were identified at the complex level. There are a limited number of cases in the literature where A.oryzae is the causative agent, particularly in the respiratory tract. A PubMed search using the keywords \"A.oryzae infections, arthritis, osteomyelitis\" did not reveal","PeriodicalId":18509,"journal":{"name":"Mikrobiyoloji bulteni","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141752124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Investigation of hsa-miR-1908 and hsa-miR-144 Expression Levels in Crimean-Congo Hemorrhagic Fever Patients].","authors":"Özlem Aldemir, Aynur Engin, Burcu Bayyurt, Serdal Arslan","doi":"10.5578/mb.202497188","DOIUrl":"https://doi.org/10.5578/mb.202497188","url":null,"abstract":"<p><p>Crimean-Congo hemorrhagic fever (CCHF) is a tick-borne zoonotic viral disease. MicroRNAs (miRNAs), which play an important role in the regulation of gene expression, are involved in many processes essential for cell life such as development, differentiation, survival, apoptosis and aging. If miRNAs fail to fulfill their functions, they cause susceptibility to many diseases, including viral infections or cause the disease to be experienced in different clinical situations, such as severe or mild. In this study, we aimed to determine the expression levels of hsa-miR-144 and hsa-miR-1908 in CCHF patients and to compare the results in different clinical courses of CCHF disease. In this study, expression levels of hsa-miR-144 and hsa-miR-1908 were detected by quantitative reverse transcription polymerase chain reaction (RT-qPCR) in blood samples obtained from 60 CCHF patients and 40 healthy individuals. We also investigated the differences in the expression levels of the microRNAs between patients with severe and non-severe disease or between patients who died and survived. Quantitative polymerase chain reaction data were uploaded to the \"Data Analysis Center\" (Qiagen, Germany) and analyzed using the ΔΔCq (ΔΔCt) method. p value was calculated according to Student's t test for genes in the study groups. The expression level of hsa-miR-144 decreased (fold change= 0.09) and the expression level of hsa-miR-1908 increased 1.44-fold in CCHF patients compared to the control group. The expression of hsa-miR-144 and hsa-miR-1908 increased 2 and 2.36-fold, respectively, in severe patients compared to non-severe patients. The expression levels of hsa-miR-144 and hsa-miR-1908 were 16.3- and 14.3-fold higher, respectively, in fatal cases compared to surviving patients and these results were statistically significant. In addition, the expression level of hsa-miR-144 was significantly decreased in patients with low leukocyte counts and the expression level of hsa-miR-1908 was significantly increased in patients with prolonged prothrombin time (PT). This is the first study in the literature investigating the expression level of hsa-miR-1908 in CCHF patients. In conclusion, the data of this study suggest that hsa-miR-144 and hsa-miR-1908 may be important biomarkers in predicting the prognosis and clinical course of CCHF disease.</p>","PeriodicalId":18509,"journal":{"name":"Mikrobiyoloji bulteni","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141752137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[A New Method for Determination of Rifampicin and Isoniazid Resistance in Mycobacterium tuberculosis complex Isolates: Capillary Tube Method].","authors":"Nazlı Arslan, Ebru Demiray Gürbüz, Ayşe Aydan Özkütük, Nuran Esen","doi":"10.5578/mb.20249764","DOIUrl":"https://doi.org/10.5578/mb.20249764","url":null,"abstract":"<p><p>Tuberculosis continues to be an important public health problem worldwide. Culture methods are still considered the gold standard in the diagnosis of tuberculosis and the determination of drug resistance. The most important limitation of these methods is their long turnaround time. Commercial culture systems developed to shorten the duration are emerging as an economic problem, especially for developing countries. Therefore, cheap, fast, easy to apply and objectively evaluable tests are needed. In this study, in addition to culture-based methods for determining RIF and INH resistance in Mycobacterium tuberculosis complex isolates, it was aimed to develop the capillary tube method to accelerate the evaluation process. The study included 27 RIF-resistant, 36 RIF -sensitive, 30 INH-resistant, and 33 INH-sensitive isolates obtained from the mycobacteriology laboratory culture collection, for which susceptibility testing to firstline drugs were previously performed using the BACTEC MGIT 960 system (BD, USA) and were stored. H37Rv standard strain and an external quality control strain (IDT3) with known RIF and INH resistance were used as quality control isolates in the study. As a new testing method, the capillary tube method for detecting rifampicin and isoniazid resistance was compared to the standard BACTEC MGIT 960 system. In the determination of RIF and INH resistance, the sensitivity of the capillary tube method compared to the reference method was determined as 85% and 80%, respectively; however, the specificity values (25% and 45.5%, respectively) for both drugs were found to be low in the studies. The time to detect resistance with the capillary tube method varied between 4-9 days. Capillary tube method, which was developed especially for the rapid identification and treatment of multidrug-resistant isolates, is promising in that it detects resistant strains in a short time with a relatively high sensitivity, although its specificity is very low. It is thought that it would be beneficial to continue the study with a larger number of samples and even improve the method with studies conducted directly from clinical samples.</p>","PeriodicalId":18509,"journal":{"name":"Mikrobiyoloji bulteni","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141752123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Evaluation of Viral Subgenomic RNAs and Antigen Presence in SARS-CoV-2 PCR Positive Cases].","authors":"Kazım Batıhan Büyükzengin, Alper Akçalı, Sevil Alkan, Gökhan Akdur","doi":"10.5578/mb.20240037","DOIUrl":"https://doi.org/10.5578/mb.20240037","url":null,"abstract":"<p><p>Polymerase chain reaction (PCR) and antigen test (AgT) are frequently used in the diagnosis of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2). Routine PCR tests that detect the virus genome cannot determine whether the virus is infectious or not. However, detection of subgenomic RNA (sgRNA) produced during the replication period may indicate active viral infection. Active virus detection can offer various health and economic benefits from isolation time to treatment. Antigen tests are also considered as indicators of infectiousness since they can detect viruses above a certain load amount. The aim of this study was to use two different subgenomic RNAs and antigen test instead of genomic RNA to examine the relationship with each other and the clinic in terms of infectiousness. Evaluating the antigen test together with subgenomic RNA as an indicator of infectiousness may show the importance of this test. SARS-CoV-2 PCR positive 109 naso/oropharyngeal swab samples stored at -80 °C were included in the study. In order to confirm the PCR positivity of these samples, E gene PCR was performed and AgT, and E and N sgRNA quantitative real-time reverse transcription-PCR (RT-qPCR) detection was performed. Of the 109 SARSCoV-2 PCR positive samples, 83 (76.14%) had antigen test positivity, 88 (80.73%) had E gene sgRNA, 96 (88.07%) had N gene sgRNA and 97 (89%) had at least one sgRNA positivity.The antigen test was found positive in 77.3% of the samples in which at least one sgRNA was detected and in 66.7% of the negative samples and this difference was not statistically significant (p= 0.475). The difference between E sgRNA and AgT positivity was significant (p= 0.023). N sgRNA was positive in 98.9% of E sgRNA positive samples and 42.9% of the negative samples and this difference was statistically significant (p= 0.0001). The AgT positivity rate was found to be 98.15% (53/54) for cycle threshold (Ct) value ≤ 25, 57.14% (12/21) for Ct 25-30, and 52.94% (18/34) for Ct ≥ 30. The difference in antigen test positivity between E gRNA Ct value ≤ 25 and > 25, ≤ 29 and > 29, < 30 and ≥ 30 was statistically significant (p= 0.0001). Antigen test positivity appears to be associated with viral load and infectivity, as expected. In our study, it has been shown that sgRNAs and AgT which are indicators of infectiousness can be detected at least 10 days after the symptom period. Using these two tests together could detect infective individuals with higher accuracy and shorten the duration of hospital stay and isolation.</p>","PeriodicalId":18509,"journal":{"name":"Mikrobiyoloji bulteni","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141752135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}