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Viral Diagnostics

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https://www.readbyqxmd.com/read/28346504/diagnostic-accuracy-of-two-multiplex-real-time-polymerase-chain-reaction-assays-for-the-diagnosis-of-meningitis-in-children-in-a-resource-limited-setting
#1
Jermaine Khumalo, Mark Nicol, Diana Hardie, Rudzani Muloiwa, Phindile Mteshana, Colleen Bamford
INTRODUCTION: Accurate etiological diagnosis of meningitis is important, but difficult in resource-limited settings due to prior administration of antibiotics and lack of viral diagnostics. We aimed to develop and validate 2 real-time multiplex PCR (RT-PCR) assays for the detection of common causes of community-acquired bacterial and viral meningitis in South African children. METHODS: We developed 2 multiplex RT- PCRs for detection of S. pneumoniae, N. meningitidis, H...
2017: PloS One
https://www.readbyqxmd.com/read/28345293/detection-of-zaire-ebolavirus-in-swine-assay-development-and-optimization
#2
B S Pickering, B Collignon, G Smith, P Marszal, G Kobinger, H M Weingartl
Ebolaviruses (family Filoviridae, order Mononegavirales) cause often fatal, haemorrhagic fever in primates including humans. Pigs have been identified as a species susceptible to Reston ebolavirus (RESTV) infection, with indicated transmission to humans in the Philippines; however, their role during Ebola outbreaks in Africa needs to be clarified. To perform surveillance studies, detection of ebolavirus requires a prerequisite validation of viral RNA and antibody detection methods in swine samples. These diagnostic tests also need to be suitable for deployment to low-level containment laboratories...
March 27, 2017: Transboundary and Emerging Diseases
https://www.readbyqxmd.com/read/28342740/the-development-of-a-real-time-reverse-transcription-polymerase-chain-reaction-rrt-pcr-assay-using-taqman-technology-for-the-pan-detection-of-bluetongue-virus-btv
#3
Catherine Mulholland, Michael J McMenamy, Bernd Hoffmann, Bernadette Earley, Bryan Markey, Joseph Cassidy, Gordon Allan, Michael D Welsh, John McKillen
Bluetongue virus (BTV) is an infectious, non-contagious viral disease of domestic and wild ruminants that is transmitted by adult females of certain Culicoides species. Since 2006, several serotypes including BTV-1, 2, 4, 6, 8, 9 and 16, have spread from the Mediterranean basin into Northern Europe for the first time. BTV-8 in particular, caused a major epidemic in northern Europe. As a result, it is evident that most European countries are at risk of BTV infection. The objective of this study was to develop and validate a real-time reverse transcriptase-polymerase chain reaction (rRT-PCR) assay based on TaqMan technology for the detection of representative strains of all BTV serotypes...
March 22, 2017: Journal of Virological Methods
https://www.readbyqxmd.com/read/28342288/the-role-of-acute-and-chronic-respiratory-colonization-and-infections-in-the-pathogenesis-of-copd
#4
REVIEW
Janice M Leung, Pei Yee Tiew, Micheál Mac Aogáin, Kurtis F Budden, Valerie Fei Lee Yong, Sangeeta S Thomas, Kevin Pethe, Philip M Hansbro, Sanjay H Chotirmall
COPD is a major global concern, increasingly so in the context of ageing populations. The role of infections in disease pathogenesis and progression is known to be important, yet the mechanisms involved remain to be fully elucidated. While COPD pathogens such as Haemophilus influenzae, Moraxella catarrhalis and Streptococcus pneumoniae are strongly associated with acute exacerbations of COPD (AECOPD), the clinical relevance of these pathogens in stable COPD patients remains unclear. Immune responses in stable and colonized COPD patients are comparable to those detected in AECOPD, supporting a role for chronic colonization in COPD pathogenesis through perpetuation of deleterious immune responses...
March 25, 2017: Respirology: Official Journal of the Asian Pacific Society of Respirology
https://www.readbyqxmd.com/read/28341587/impact-of-rapid-molecular-respiratory-virus-testing-on-real-time-decision-making-in-a-pediatric-emergency-department
#5
Daniel T Rogan, Mohit S Kochar, Samuel Yang, James V Quinn
Acute respiratory illnesses (ARIs) are usually viral [influenza, respiratory syncytial virus (RSV)] and account for 25% of emergency department (ED) peak-season visits. Laboratory respiratory PCR testing is accurate albeit slow for ED management, whereas rapid antigen testing is inaccurate. We determined the impact of bedside influenza/RSV PCR (molecular point-of-care test; mPOCT) on pediatric ARI management. This was a prospective cohort study of consecutive pediatric patients with ED-ordered respiratory PCR test, enrolled over 9 weeks during peak flu season...
March 21, 2017: Journal of Molecular Diagnostics: JMD
https://www.readbyqxmd.com/read/28341113/dynamics-of-african-horse-sickness-virus-nucleic-acid-and-antibody-in-horses-following-immunization-with-a-commercial-polyvalent-live-attenuated-vaccine
#6
C T Weyer, J D Grewar, P Burger, C Joone, C Lourens, N J MacLachlan, A J Guthrie
African horse sickness (AHS) is a fatal disease of equids relevant to the global equine industry. Detection of AHS virus (AHSV) during outbreaks has become more rapid and efficient with the advent of group specific reverse transcriptase quantitative polymerase chain reaction (GS RT-qPCR) assays to detect AHSV nucleic acid. Use of GS RT-qPCR together with recently described type specific (TS RT-qPCR) assays cannot only expedite diagnosis of AHS but also facilitate further evaluation of the dynamics of AHSV infection in the equine host...
March 21, 2017: Vaccine
https://www.readbyqxmd.com/read/28337608/age-specific-application-of-neutrophil-to-lymphocyte-ratio-in-meningitis-a-nationwide-study
#7
A-F A Mentis, M A Kyprianou, G Tzanakaki
Cerebrospinal fluid (CSF) neutrophil counts and neutrophil-to-lymphocyte ratio (NLR) are useful in distinguishing bacterial and viral meningitis. Given that meningitis is clinically heterogeneous with regard to age, here we investigated the validity of the CSF NLR and neutrophil assay according to age group. Data from the nationwide referral of >4,000 meningitis cases to the Hellenic Meningitis Reference Laboratory between 2006 and 2013 were examined. CSF NLR and neutrophil counts were stratified according to age, and assay performance was determined using previous cut-off values of 2 and 287 cells/μl for CSF NLR and neutrophils respectively...
March 24, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28335554/complete-and-incomplete-hepatitis-b-virus-particles-formation-function-and-application
#8
REVIEW
Jianming Hu, Kuancheng Liu
Hepatitis B virus (HBV) is a para-retrovirus or retroid virus that contains a double-stranded DNA genome and replicates this DNA via reverse transcription of a RNA pregenome. Viral reverse transcription takes place within a capsid upon packaging of the RNA and the viral reverse transcriptase. A major characteristic of HBV replication is the selection of capsids containing the double-stranded DNA, but not those containing the RNA or the single-stranded DNA replication intermediate, for envelopment during virion secretion...
March 21, 2017: Viruses
https://www.readbyqxmd.com/read/28331560/introducing-crucial-protein-panel-of-gastric-adenocarcinoma-disease
#9
Mostafa Rezaei-Tavirani, Majid Rezaei-Tavirani, Vahid Mansouri, Seyed Mohammad Mahdavi, Reza Valizadeh, Mohammad Rostami-Nejad, Mohammad Reza Zali
AIM: Since interactome analysis of diseases can provide candidate biomarker panel related to the diseases, in this research, protein-protein interaction (PPI) network analysis is used to introduce the involved crucial proteins in Gastric adenocarcinoma (GA). BACKGROUND: Gastric adenocarcinoma (GA) is the most common type of stomach cancer. There is no efficient diagnostic molecular method for GA. METHOD: Applying Cytoscape software 3.4.0 and String Database, the PPI network was constructed for 200 genes...
2017: Gastroenterology and Hepatology From Bed to Bench
https://www.readbyqxmd.com/read/28329096/diffuse-white-matter-signal-abnormalities-on-magnetic-resonance-imaging-are-associated-with-human-immunodeficiency-virus-type-1-viral-escape-in-the-central-nervous-system-among-patients-with-neurological-symptoms
#10
Ruthiran Kugathasan, Dami A Collier, Lewis J Haddow, Kate El Bouzidi, Simon G Edwards, Jonathan D Cartledge, Robert F Miller, Ravindra K Gupta
Background.: Human immunodeficiency virus type 1 (HIV-1) can replicate independently in extravascular compartments such as the central nervous system, resulting in either cerebrospinal fluid (CSF) discordance (viral load [VL] in CSF 0.5 log10 copies HIV-1 RNA greater than plasma VL) or escape (detection of HIV VL >50 copies/mL in CSF in patients with suppressed plasma VL <50 copies/mL). Both discordance and escape may be associated with neurological symptoms. We explored risk factors for CSF discordance and escape in patients presenting with diverse neurological problems...
March 13, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28328809/infectious-diseases-prevalence-vaccination-coverage-and-diagnostic-challenges-in-a-population-of-internationally-adopted-children-referred-to-a-tertiary-care-children-s-hospital-from-2009-to-2015
#11
Sara Sollai, Francesca Ghetti, Leila Bianchi, Maurizio de Martino, Luisa Galli, Elena Chiappini
Infectious diseases are common in internationally adopted children (IAC).With the objective to evaluate infectious diseases prevalence in a large cohort of IAC and to explore possible risk factors for tuberculosis (TB) and parasitic infections, clinical and laboratory data at first screening visit of all IAC (<18 years) consecutively referred to our Center in 2009 to 2015 were collected and analyzed.In total, 1612 children (median age: 5.40 years; interquartile range: 3.00-7.90) were enrolled, 123/1612 (7...
March 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28327811/undiagnosed-acute-hiv-infection-identified-through-rna-testing-of-pooled-serum-samples-obtained-during-a-dengue-outbreak-in-s%C3%A3-o-paulo-brazil
#12
Elaine Monteiro Matsuda, Daniela Rodrigues Colpas, Norberto Camilo Campos, Luana Portes Ozorio Coelho, Andreia Moreira Dos Santos Carmo, Luís Fernando de Macedo Brígido
INTRODUCTION: Improving HIV diagnostics and treatment is necessary to end the AIDS epidemic. Pooled plasma can be used to identify patients with acute HIV disease, even before serological tests. During dengue outbreaks, patients having symptoms common to other acute viral diseases might seek medical care. METHODS: We evaluated HIV RNA in pooled seronegative dengue samples. RESULTS: After excluding individuals with a known HIV diagnosis, an HIV-1 prevalence of 0...
January 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/28326747/laboratory-methods-for-diagnostics-of-hiv-infection-and-hiv-associated-neuroinfections
#13
Pavol Beno, Alzbeta Kaiglova, Martin Samohyl
HIV Infection resulting in AIDS remains serious global public health problem. In the fight with the global health problem plays a key role a simple, reliable and fast diagnostics. An important method in diagnostics is the identification and detection of viral capside p24 antigen levels. Fourth generation tests for the diagnostics of HIV infection simultaneously detect the presence of HIV antibodies and p24 antigen. Based on the monitoring of CD4 count, we can estimate the stage in which the infection is, and we can also suggest a therapeutic approach...
January 2017: Neuro Endocrinology Letters
https://www.readbyqxmd.com/read/28325688/current-and-emerging-molecular-tests-for-human-papillomavirus-related-neoplasia-in-the-genomic-era
#14
REVIEW
Sixto M Leal, Margaret L Gulley
Laboratory tests have a key role in preventing human papillomavirus (HPV)-driven carcinomas and in guiding therapeutic interventions. An understanding of the virology, immunology, and carcinogenesis of HPV is essential for choosing appropriate diagnostic test modalities and developing new and even more effective cancer prevention strategies. HPV infects basal epithelial cells on multiple surfaces and induces carcinoma primarily in the cervix and the oropharynx. HPV types are stratified as high risk or low risk based on their carcinogenic potential, driven largely by viral interference with cell cycle regulation and the DNA damage response to promote continuous cell division while thwarting apoptosis, which enables mutation accumulation...
March 18, 2017: Journal of Molecular Diagnostics: JMD
https://www.readbyqxmd.com/read/28323868/-waiting-for-daas-a-retrospective-chart-review-of-patients-with-untreated-hepatitis-c-in-rwanda
#15
Neil Gupta, Jules Kabahizi, Constance Mukabatsinda, Timothy David Walker, Emmanuel Musabeyezu, Athanase Kiromera, Jennifer Ilo Van Nuil, Kevin Steiner, Joia Mukherjee, Sabin Nsanzimana, Aimable Mbituyumuremyi
BACKGROUND: Access to treatment for hepatitis C virus (HCV) in sub-Saharan Africa is extremely limited. With the advent of direct acting antivirals (DAAs), highly effective and easy-to-deliver oral regimens are now available on the global market. This study was conducted to understand the background and characteristics of a national cohort of patients with HCV infection enrolled in care and awaiting therapy with DAAs. METHODS AND FINDINGS: We conducted a retrospective chart review of all adult patients with confirmed HCV infection who were currently enrolled in care and treatment at the four existing hepatitis referral centers in Rwanda...
2017: PloS One
https://www.readbyqxmd.com/read/28320938/effectiveness-of-unaids-targets-and-hiv-vaccination-across-127-countries
#16
Jan Medlock, Abhishek Pandey, Alyssa S Parpia, Amber Tang, Laura A Skrip, Alison P Galvani
The HIV pandemic continues to impose enormous morbidity, mortality, and economic burdens across the globe. Simultaneously, innovations in antiretroviral therapy, diagnostic approaches, and vaccine development are providing novel tools for treatment-as-prevention and prophylaxis. We developed a mathematical model to evaluate the added benefit of an HIV vaccine in the context of goals to increase rates of diagnosis, treatment, and viral suppression in 127 countries. Under status quo interventions, we predict a median of 49 million [first and third quartiles 44M, 58M] incident cases globally from 2015 to 2035...
March 20, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28319847/a-european-multicentre-study-on-the-comparison-of-hcv-viral-loads-between-veris-hcv-assay-and-cobas-%C3%A2-taqman-%C3%A2-hcv-test-and-realtime-hcv-assay
#17
Patrick Braun, Monica Drago, Diana Fanti, Hervé Fleury, Jörg Hofmann, Jacques Izopet, Sebastian Kühn, Alessandra Lombardi, Valeria Micheli, Karine Sauné, Pascale Trimoulet, Duncan Whittaker, Alain Artus, Daniel Rhodes
BACKGROUND: Beckman Coulter has developed the VERIS HCV Assay for use on the new fully automated DxN VERIS Molecular Diagnostic System(¥) for HCV viral load monitoring. OBJECTIVES: Evaluate the clinical performance of the new quantitative VERIS HCV Assay. STUDY DESIGN: Comparison was performed on 279 plasma specimens from HCV infected patients tested with the VERIS HCV Assay and COBAS(®) Ampliprep/COBAS(®) Taqman(®) HCV Test and 369 specimens tested with the VERIS HCV Assay and RealTime HCV Assay...
March 9, 2017: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/28315708/2016-international-meeting-of-the-global-virus-network
#18
REVIEW
Ramesh Akkina, Heinz Ellerbrok, William Hall, Hideki Hasegawa, Yasushi Kawaguchi, Harold Kleanthous, Edward McSweegan, Natalia Mercer, Victor Romanowski, Hirofumi Sawa, Anders Vahlne
The Global Virus Network (GVN) was established in 2011 in order to strengthen research and responses to current viral causes of human disease and to prepare against new viral pandemic threats. There are now 38 GVN Centers of Excellence and 6 Affiliate laboratories in 24 countries. GVN scientists meet annually to learn about each other's current research, address collaborative priorities and plan future programs. The 2016 meeting was held from October 23-25 in Hokkaido, Japan, in partnership with the Japanese Society for Virology, the National Institute of Infectious Diseases of Japan and the Research Center for Zoonosis Control of Hokkaido University...
March 16, 2017: Antiviral Research
https://www.readbyqxmd.com/read/28306597/diagnosis-of-viral-hepatitis
#19
Philippa J Easterbrook, Teri Roberts, Anita Sands, Rosanna Peeling
PURPOSE OF REVIEW: Chronic hepatitis B virus (HBV) and hepatitis C virus (HCV) infections and HIV-HBV and HCV coinfection are major causes of chronic liver disease worldwide. Testing and diagnosis is the gateway for access to both treatment and prevention services, but there remains a large burden of undiagnosed infection globally. We review the global epidemiology, key challenges in the current hepatitis testing response, new tools to support the hepatitis global response (2016-2020 Global Hepatitis Health Sector strategy, and 2017 WHO guidelines on hepatitis testing and their key recommendations) and future directions and innovations in hepatitis diagnostics...
March 16, 2017: Current Opinion in HIV and AIDS
https://www.readbyqxmd.com/read/28303825/evaluation-of-loop-mediated-isothermal-amplification-assay-for-rapid-diagnosis-of-acanthamoeba-keratitis
#20
Abhishek Mewara, Sumeeta Khurana, Shakila Yoonus, Kirti Megha, Parveen Tanwar, Amit Gupta, Rakesh Sehgal
BACKGROUND: The clinical features of Acanthamoeba keratitis (AK) are non-specific and closely resemble bacterial, viral and fungal keratitis. MATERIALS AND METHODS: We compared loop-mediated isothermal amplification (LAMP) with microscopy, non-nutrient agar (NNA) culture and polymerase chain reaction (PCR) in clinical suspects of AK. RESULTS: Of 52 clinical samples (42 AK suspects and 10 proven bacterial, viral or fungal keratitis), 3 were positive by direct microscopy (sensitivity 60%, confidence interval [CI]: 17%-92...
January 2017: Indian Journal of Medical Microbiology
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