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Viral Diagnostics

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https://www.readbyqxmd.com/read/28429165/the-use-of-rapid-test-quikread-go%C3%A2-strep-a-in-bacterial-pharyngotonsillitis-diagnosing-and-therapeutic-decisions
#1
E Stefaniuk, K Bosacka, M Wanke-Rytt, W Hryniewicz
Group A Streptococci (GAS) are the main causative agents of bacterial pharyngitis, which require antibiotic therapy. Rapid diagnostic tests detecting GAS combined with Centor/McIsaac score enable accurate differential diagnosis (viral vs. bacterial) and prompt commencement of targeted treatment. The aim of this study was to assess the specificity, sensitivity, PPV and NPV of QuikRead go® Strep A (Orion Diagnostica Oy, Finland) recommended for the detection of GAS in pharyngeal swabs. Quick diagnostic test results were compared with physical examination findings, Centor/McIsaac score and results of reference testing (conventional microbial cultures)...
April 21, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28427352/point-of-sampling-detection-of-zika-virus-within-a-multiplexed-kit-capable-of-detecting-dengue-and-chikungunya
#2
Ozlem Yaren, Barry W Alto, Priyanka V Gangodkar, Shatakshi R Ranade, Kunal N Patil, Kevin M Bradley, Zunyi Yang, Nikhil Phadke, Steven A Benner
BACKGROUND: Zika, dengue, and chikungunya are three mosquito-borne viruses having overlapping transmission vectors. They cause diseases having similar symptoms in human patients, but requiring different immediate management steps. Therefore, rapid (< one hour) discrimination of these three viruses in patient samples and trapped mosquitoes is needed. The need for speed precludes any assay that requires complex up-front sample preparation, such as extraction of nucleic acids from the sample...
April 20, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28424887/a-metagenomics-study-for-the-identification-of-respiratory-viruses-in-mixed-clinical-specimens-an-application-of-the-iterative-mapping-approach
#3
Yu-Nong Gong, Shu-Li Yang, Guang-Wu Chen, Yu-Wen Chen, Yhu-Chering Huang, Hsiao-Chen Ning, Kuo-Chien Tsao
Metagenomic approaches to detect viral genomes and variants in clinical samples have various challenges, including low viral titers and bacterial and human genome contamination. To address these limitations, we examined a next-generation sequencing (NGS) and iterative mapping approach for virus detection in clinical samples. We analyzed 40 clinical specimens from hospitalized children diagnosed with acute bronchiolitis, croup, or respiratory tract infections in which virus identification by viral culture or polymerase chain reaction (PCR) was unsuccessful...
April 19, 2017: Archives of Virology
https://www.readbyqxmd.com/read/28421031/fatal-outcome-of-european-tick-borne-encephalitis-after-vaccine-failure
#4
Parham Sendi, Cédric Hirzel, Stefan Pfister, Rahel Ackermann-Gäumann, Denis Grandgirard, Ekkehard Hewer, Arto C Nirkko
Tick-borne encephalitis is a viral disease affecting the central nervous system. It is endemic in Switzerland with 200-250 notified cases annually. Active immunization is effective for persons in all age groups. Vaccine failure is rare, in particular after a completed vaccination course. Here, we describe the case of 67-year-old man with a fatal outcome despite vaccination. The diagnosis was confirmed by extensive postmortem analyses. The diagnostic challenges of vaccine failure in tick-borne encephalitis and the dynamics of the immune response in vaccination breakthrough are discussed...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28419213/risks-factors-for-congenital-cmv-infection-following-primary-and-non-primary-maternal-infection-a-prospective-neonatal-screening-study-using-pcr-in-saliva
#5
Marianne Leruez-Ville, Jean-François Magny, Sophie Couderc, Christine Pichon, Marine Parodi, Laurence Bussières, Tiffany Guilleminot, Idir Ghout, Yves Ville
Background: The design of diagnostic and preventive strategies have been prevented by gaps in knowledge of the epidemiology of congenital CMV (cCMV) with the type of maternal infection as well as the lack of large-scale neonatal screening tools. Methods: 11,715 consecutive newborns were screened for cCMV by PCR in saliva. Prevalence, type of maternal infection, socio-demographic, obstetrical and serological data were analyzed. Results: Positive predictive value of CMV PCR in saliva was 59%, false positive results were associated with lower viral loads (p<0...
April 17, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28413059/viral-exanthems-an-update-on-laboratory-testing-of-the-adult-patient
#6
REVIEW
Abraham M Korman, Ali Alikhan, Benjamin H Kaffenberger
Although classic viral exanthems of childhood are well described, they are rarely differentiated in adults. Laboratory techniques for viral identification have advanced without substantial literature to suggest how a dermatologist ought to conduct a cost-effective and diagnostic viral panel. Certain clinical features such as petechiae, vesicles, and dusky macular or morbilliform exanthems point strongly toward a viral exanthem. Differentiation of drug and viral causes of morbilliform eruptions has proven difficult...
March 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/28409071/acute-cytomegalovirus-cmv-infection-associated-with-hemophagocytic-lymphohistiocytosis-hlh-in-an-immunocompetent-host-meeting-all-eight-hlh-2004-diagnostic-criteria
#7
Alex K Bonnecaze, Wesley G Willeford, Peter Lichstein, Jill Ohar
Hemophagocytic lymphohistiocytosis (HLH) is a rare and often deadly syndrome characterized by severe inflammation and cytokine dysregulation. The disease is defined by the HLH-2004 criteria, requiring five of eight findings, and is further differentiated into either primary or secondary causes. Primary HLH tends to be of genetic etiology, while secondary HLH results from other insults such as infection. Secondary HLH is most commonly associated with viral infections in immunocompromised patients. Acute cytomegalovirus (CMV) associated HLH in the immunocompetent host is exceedingly rare and only documented in four case reports to date...
March 2, 2017: Curēus
https://www.readbyqxmd.com/read/28407381/arrival-of-rabbit-haemorrhagic-disease-virus-2-to-northern-europe-emergence-and-outbreaks-in-wild-and-domestic-rabbits-oryctolagus-cuniculus-in-sweden
#8
A S Neimanis, H Ahola, S Zohari, U Larsson Pettersson, C Bröjer, L Capucci, D Gavier-Widén
Incursion of rabbit haemorrhagic disease virus (RHDV) into Sweden was documented in 1990 and it is now considered endemic in wild rabbit (Oryctolagus cuniculus) populations. Rabbit haemorrhagic disease virus 2 (RHDV2), a new, related lagovirus was first detected in France in 2010, and has spread rapidly throughout Europe and beyond. However, knowledge of RHDV2 in northern Europe is sporadic and incomplete, and in Sweden, routinely available diagnostic methods to detect rabbit haemorrhagic disease (RHD) do not distinguish between types of virus causing disease...
April 13, 2017: Transboundary and Emerging Diseases
https://www.readbyqxmd.com/read/28404682/comparison-of-the-eplex%C3%A2-respiratory-pathogen-panel-with-laboratory-developed-real-time-pcr-for-the-detection-of-respiratory-pathogens
#9
R H T Nijhuis, D Guerendiain, E C J Claas, K E Templeton
Infections of the respiratory tract can be caused by a diversity of pathogens, both viral and bacterial. Rapid microbiological diagnosis ensures appropriate antimicrobial therapy as well as effective implementation of isolation precautions. The ePlex® Respiratory Pathogen Panel (RP panel) is a novel molecular based assay, developed by GenMark Diagnostics Inc. (Carlsbad, California), to be performed within a single cartridge for the diagnosis of 25 respiratory pathogens (viral and bacterial). The objective of this study was to compare the performance of the RP panel with laboratory developed real-time PCR assays, using a variety of previously collected clinical respiratory specimens...
April 12, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28403441/clinical-and-laboratory-diagnosis-of-dengue-virus-infection
#10
REVIEW
David A Muller, Alexandra C I Depelsenaire, Paul R Young
Infection with any of the 4 dengue virus serotypes results in a diverse range of symptoms, from mild undifferentiated fever to life-threatening hemorrhagic fever and shock. Given that dengue virus infection elicits such a broad range of clinical symptoms, early and accurate laboratory diagnosis is essential for appropriate patient management. Virus detection and serological conversion have been the main targets of diagnostic assessment for many years, however cross-reactivity of antibody responses among the flaviviruses has been a confounding issue in providing a differential diagnosis...
March 1, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28403327/internal-control-for-real-time-polymerase-chain-reaction-based-on-ms2-bacteriophage-for-rna-viruses-diagnostics
#11
Miriam Ribas Zambenedetti, Daniela Parada Pavoni, Andreia Cristine Dallabona, Alejandro Correa Dominguez, Celina de Oliveira Poersch, Stenio Perdigão Fragoso, Marco Aurélio Krieger
BACKGROUND: Real-time reverse transcription polymerase chain reaction (RT-PCR) is routinely used to detect viral infections. In Brazil, it is mandatory the use of nucleic acid tests to detect hepatitis C virus (HCV), hepatitis B virus and human immunodeficiency virus in blood banks because of the immunological window. The use of an internal control (IC) is necessary to differentiate the true negative results from those consequent from a failure in some step of the nucleic acid test. OBJECTIVES: The aim of this study was the construction of virus-modified particles, based on MS2 bacteriophage, to be used as IC for the diagnosis of RNA viruses...
April 6, 2017: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/28403190/prevalence-and-genotype-distribution-of-hepatitis-delta-virus-among-chronic-hepatitis-b-carriers-in-central-vietnam
#12
Hung Minh Nguyen, Bui Tien Sy, Nguyen Thanh Trung, Nghiem Xuan Hoan, Heiner Wedemeyer, Thirumalaisamy P Velavan, C-Thomas Bock
Hepatitis D virus (HDV) infection plays an important role in liver diseases. However, the molecular epidemiology and impact of HDV infection in chronic hepatitis B (CHB) remain uncertain in Vietnam. This cross-sectional study aimed to investigate the prevalence and genotype distribution of HDV among HBsAg-positive patients in Central Vietnam. 250 CHB patients were tested for HDV using newly established HDV-specific RT-PCR techniques. HDV genotypes were determined by direct sequencing. Of the 250 patients 25 (10%) had detectable copies of HDV viral RNA...
2017: PloS One
https://www.readbyqxmd.com/read/28402681/characterization-of-oligonucleotide-aptamers-targeting-the-5-utr-from-dengue-virus
#13
Elismar Jn Cnossen, Amanda G Silva, Karina Marangoni, Rívia Ar Arruda, Evellyn G Souza, Fabiana Aa Santos, Patrícia T Fujimura, Jonny Yokosawa, Luiz R Goulart, Adriana F Neves
AIM: The dengue virus is responsible for a high worldwide incidence of infections, aggravated by late diagnosis, and often confused with other tropical diseases. Results/methodology: Oligonucleotide aptamers binding to the 5'-UTR from dengue virus selected after eight rounds by systematic evolution of ligands by exponential enrichment technology were analyzed by dot-blot assay and in silico prediction of secondary structures, demonstrating the presence of stem-loops that may have the potential for interaction with the viral genome, which can lead to loss of their original conformation...
April 12, 2017: Future Medicinal Chemistry
https://www.readbyqxmd.com/read/28397701/cytomegalovirus-infection-associated-with-inflammatory-bowel-disease
#14
REVIEW
Britta Siegmund
Refractory colitis in patients with inflammatory bowel disease is a complicated clinical disorder that might, in some patients, even necessitate surgery. Hence the diagnosis of additional complications is of utmost importance. Colitis mediated by cytomegalovirus is one such complication. The high seroprevalence and latent nature of cytomegalovirus, with the possibility of viral replication without mediating disease, poses a real challenge for the diagnosis of cytomegalovirus-mediated colitis. The challenge in daily clinical practice is to distinguish cytomegalovirus replication from cytomegalovirus-mediated colitis in patients with inflammatory bowel disease who have refractory colitis...
May 2017: Lancet. Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/28397481/diagnosis-of-hepatitis-c-virus-infection-using-a-novel-mouse-monoclonal-antibody-to-detect-serum-hcv-e1-e2-antigens
#15
Iman Touni, Ashraf A Tabll, Shaimaa S Sobieh, Maha A Hewedy, Yasmine S El Abd, Sergei Viazov
BACKGROUND: Hepatitis C virus (HCV) is a major cause of liver disease worldwide and in Egypt. The aim of this study was to detect HCV E1/E2 antigens using a novel mouse monoclonal antibody (mAb) designated (7G9) as a diagnostic and alternative approach for HCV detection. METHODS: The detection of HCV-E1/E2 antigens in 138 patients positive for HCV infection tested by RT-PCR and 25 healthy individuals negative for HCV as control group was done by an optimized in-house ELISA and DotELISA (based on the molecular mimicry of E2 to immunoglobulins)...
April 1, 2017: Clinical Laboratory
https://www.readbyqxmd.com/read/28396717/annexin-a2-as-a-biomarker-for-hepatocellular-carcinoma-in-egyptian-patients
#16
Mohamed K Shaker, Hanzada I Abdel Fattah, Ghada S Sabbour, Iman F Montasser, Sara M Abdelhakam, Eman El Hadidy, Rehab Yousry, Ahmed K El Dorry
AIM: To investigate the clinical utility of serum annexin A2 (ANXA2) as a diagnostic marker for early hepatocellular carcinoma (HCC). METHODS: This study was performed in HCC Clinic of Ain Shams University Hospitals, Cairo, Egypt and included: Group 1: Fifty patients with early stage HCC (Barcelona Clinic Liver Cancer stage A); Group 2: Twenty five patients with chronic liver disease; and Control Group: Fifteen healthy, age- and sex-matched subjects who were seronegative for viral hepatitis markers...
March 28, 2017: World Journal of Hepatology
https://www.readbyqxmd.com/read/28393985/-importance-of-respiratory-virus-in-immunocompetent-adult-patients-hospitalized-with-community-acquired-pneumonia
#17
Fernando Saldías Peñafiel, Marcos Ortega Gutiérrez, Gino Fuentes López, José Manuel Elola Aránguiz, Javier Uribe Monasterio, Arturo Morales Soto, Orlando Díaz Patiño
BACKGROUND: Community-acquired pneumonia (CAP) is a relevant worldwide cause of morbidity and mortality in adult population, however its etiology is often not identified and therapy is empirical. AIM: To assess the etiology of CAP in immunocompetent adult hospitalized patients using conventional and molecular diagnostic methods. MATERIAL AND METHODS: We prospectively studied 240 adult patients who were hospitalized for CAP to identify the microbial etiology...
December 2016: Revista Médica de Chile
https://www.readbyqxmd.com/read/28389843/impact-of-respiratory-virus-infections-in-exacerbation-of-acute-and-chronic-rhinosinusitis
#18
REVIEW
Kai Sen Tan, Yan Yan, Hsiao Hui Ong, Vincent T K Chow, Li Shi, De-Yun Wang
Rhinosinusitis (RS) is a symptomatic disease classification of many causes and is a major economic burden worldwide. It is widely accepted that RS is further classified into acute (ARS) and chronic (CRS) rhinosinusitis based on the duration of the symptoms, and that viral infection plays a large role in initiating or potentiating the disease. In this review, we examine the role of respiratory virus infection in the exacerbation of ARS and CRS. We explore the epidemiology of viral exacerbation of ARS and CRS and highlight key viruses that may cause exacerbation...
April 2017: Current Allergy and Asthma Reports
https://www.readbyqxmd.com/read/28388925/a-robust-and-cost-effective-approach-to-sequence-and-analyze-complete-genomes-of-small-rna-viruses
#19
Kiril M Dimitrov, Poonam Sharma, Jeremy D Volkening, Iryna V Goraichuk, Abdul Wajid, Shafqat Fatima Rehmani, Asma Basharat, Ismaila Shittu, Tony M Joannis, Patti J Miller, Claudio L Afonso
BACKGROUND: Next-generation sequencing (NGS) allows ultra-deep sequencing of nucleic acids. The use of sequence-independent amplification of viral nucleic acids without utilization of target-specific primers provides advantages over traditional sequencing methods and allows detection of unsuspected variants and co-infecting agents. However, NGS is not widely used for small RNA viruses because of incorrectly perceived cost estimates and inefficient utilization of freely available bioinformatics tools...
April 7, 2017: Virology Journal
https://www.readbyqxmd.com/read/28388922/viral-and-serological-kinetics-in-zika-virus-infected-patients-in-south-korea
#20
Young Eui Jeong, Go-Woon Cha, Jung Eun Cho, Eun Ju Lee, Youngmee Jee, Won-Ja Lee
Zika virus is a mosquito-borne flavivirus that causes clinical symptoms similar to those observed in dengue and chikungunya virus infections. The Korea Centers for Disease Control and Prevention initiated laboratory testing using a real-time reverse transcription-polymerase chain reaction in January 2016. More than 1,000 suspected cases of infection were tested and nine were confirmed as imported cases of Zika virus infection from January to July 2016. The travel destinations of the infected individuals were Brazil, Philippines, Viet Nam, Guatemala, Puerto Rico, and the Dominican Republic...
April 7, 2017: Virology Journal
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