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Viral load monitoring

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https://www.readbyqxmd.com/read/28550721/clinical-performance-of-the-veris-hcv-assay-for-hepatitis-c-virus-rna-quantification
#1
Laure Izquierdo, Corinne Prégermain, Corinne Hottelet, Gwenaëlle Decombe, Anne-Marie Roque-Afonso
BACKGROUND: Diagnosis of hepatitis C virus (HCV) infection and treatment monitoring rely on detection/quantification of HCV RNA and real-time polymerase chain reaction (PCR) techniques are expected to equivalently quantify the different HCV genotypes. OBJECTIVE: The clinical performance of the VERIS HCV assay for HCV RNA quantification was compared to that of the Abbott RealTime HCV assay. STUDY DESIGN: Qualitative concordance and quantitative comparison were evaluated on a first panel of 286 clinical samples containing HCV genotypes 1-6...
May 18, 2017: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/28545573/peroxisome-proliferators-activated-receptor-ppar-agonists-activate-hepatitis-b-virus-replication-in-vivo
#2
Lingyao Du, Yuanji Ma, Miao Liu, Libo Yan, Hong Tang
BACKGROUND: PPAR agonists are often used in HBV infected patients with metabolic disorders. However, as liver-enriched transcriptional factors, PPARs would activate HBV replication. Risks exsit in such patients. This study aimed to assess the influence of commonly used synthetic PPAR agonists on hepatitis B virus (HBV) transcription, replication and expression through HBV replicative mouse models, providing information for physicians to make necessary monitoring and therapeutic adjustment when HBV infected patients receive PPAR agonists treatment...
May 25, 2017: Virology Journal
https://www.readbyqxmd.com/read/28531553/hiv-1-viral-load-measurement-in-venous-blood-and-fingerprick-blood-using-abbott-realtime-hiv-1-dbs-assay
#3
Ning Tang, Vihanga Pahalawatta, Andrea Frank, Zowie Bagley, Raquel Viana, John Lampinen, Gregor Leckie, Shihai Huang, Klara Abravaya, Carole L Wallis
BACKGROUND: HIV RNA suppression is a key indicator for monitoring success of antiretroviral therapy. From a logistical perspective, viral load (VL) testing using Dried Blood Spots (DBS) is a promising alternative to plasma based VL testing in resource-limited settings. OBJECTIVES: To evaluate the analytical and clinical performance of the Abbott RealTime HIV-1 assay using a fully automated one-spot DBS sample protocol. STUDY DESIGN: Limit of detection (LOD), linearity, lower limit of quantitation (LLQ), upper limit of quantitation (ULQ), and precision were determined using serial dilutions of HIV-1 Virology Quality Assurance stock (VQA Rush University), or HIV-1-containing armored RNA, made in venous blood...
May 13, 2017: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/28524912/gold-nanocages-with-dual-modality-for-image-guided-therapeutics
#4
Shijin Bao, Shengnan Huang, Ying Liu, Yurong Hu, Weiping Wang, Mengfei Ji, Huili Li, Ning Xia Zhang, Chengzhi Song, Shaofeng Duan
Numerous studies have demonstrated that microRNAs are very important in cancer development and progression. However, the complex relationship between the size of microRNA delivery systems, cellular uptake, biodistribution and therapeutic efficiency remains unclear. Herein, we have successfully constructed a series of differently-sized microRNA delivery systems, miR-26a-loaded, hyaluronic acid-modified, polyetherimide-conjugated PEGylated gold nanocage ternary nanocomplexes (PPHAuNCs-TNCs), which can be monitored optically by fluorescence and photoacoustic tomography imaging...
May 19, 2017: Nanoscale
https://www.readbyqxmd.com/read/28523305/the-impact-of-liver-steatosis-on-early-and-sustained-treatment-response-in-chronic-hepatitis-c-patients
#5
Alice Elena Găman, Anca Marilena Ungureanu, Adriana Turculeanu, Dan IonuŢ Gheonea, Andrei Ioan Drocaş, George Mitroi, Maria DobriŢoiu, Maria Victoria Comănescu, Andreea Doriana Stănculescu, Ramona Cioboată, Claudiu Florin Jieanu, Paul Ioan Tomescu
Steatosis is a frequent feature of hepatitis C virus (HCV) infection. Steatosis may be an important cofactor in both accelerating fibrosis and increasing liver necroinflammatory activity in chronic hepatitis C. The main objective of this study was the evaluation of biological response rates, early viral response, sustained viral response in patients with chronic hepatitis C treated with Interferon-alpha (IFN-α), Pegylated (PEG)-IFN-α2a or -α2b plus Ribavirin and to relate it to the presence of hepatic steatosis...
2017: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/28521719/virological-suppression-and-patterns-of-resistance-amongst-patients-on-antiretroviral-therapy-at-4-nigerian-military-hospitals
#6
Keshinro Babajide, Ayemoba Ojor, Terfa Kene, Ake Julie, Crowell Trevor A, Adamu Yakubu, Mohammed Tahir, Okoye Ifeanyi, Odeyemi Sunday, Crawford Keith, Hughes Lindsay, Akintunde Ezekiel, Umar Tahir, Hamm Tiffany E, Njoku Ogbonnaya S
BACKGROUND: In resource-constrained settings, plasma HIV-1 RNA quantification has not been routinely available for the monitoring of response to antiretroviral therapy. This study evaluated virological suppression rates amongst patients on first-line ART in four Nigerian military hospitals. METHODS: We conducted a cross-sectional study of 325 randomly selected adult clinic clients (≥18 years old) on first-line ART regimens at four Nigerian military hospitals. Plasma HIV-1 RNA was assayed using a Roche COBAS TaqMan48 with High Pure System...
May 16, 2017: Current HIV Research
https://www.readbyqxmd.com/read/28515291/differential-disease-susceptibility-in-experimentally-reptarenavirus-infected-boa-constrictors-and-ball-pythons
#7
Mark D Stenglein, David Sanchez-Migallon Guzman, Valentina E Garcia, Marylee L Layton, Laura L Hoon-Hanks, Scott M Boback, M Kevin Keel, Tracy Drazenovich, Michelle G Hawkins, Joseph L DeRisi
Inclusion body disease (IBD) is an infectious disease originally described in captive snakes. It has traditionally been diagnosed by the presence of large eosinophilic cytoplasmic inclusions, and is associated with neurological, gastrointestinal and lymphoproliferative disorders. Previously, we identified and established a culture system for a novel lineage of arenaviruses isolated from boa constrictors diagnosed with IBD. Although ample circumstantial evidence suggested that these viruses, now known as reptarenaviruses, cause IBD, there has been no formal demonstration of disease causality since their discovery...
May 17, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28515216/assessment-of-the-cavidi-exavir%C3%A2-load-assay-for-monitoring-plasma-viral-load-in-hiv-2-infected-patients
#8
Pedro Borrego, Maria Fátima Gonçalves, Perpétua Gomes, Lavínia Araújo, Inês Moranguinho, Inês Brito Figueiredo, Isabel Barahona, José Rocha, Claudino Mendonça, Maria Cesarina Cruz, Jorge Barreto, Nuno Taveira
HIV plasma viral load is an established marker of disease progression and of response to antiretroviral therapy but currently there is no commercial assay validated for the quantification of viral load in HIV-2 infected individuals. The aim of this study was to make the first clinical evaluation of Cavidi ExaVir™ Load version 3 in HIV-2 infected patients. Samples were collected from a total of 102 individuals living in Cape Verde and HIV-2 viral load was quantified by both ExaVir™ Load and a reference in-house real-time quantitative PCR (qPCR) used in Portugal in 91 samples...
May 17, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28513810/epstein-barr-virus-encephalitis-in-solid-organ-transplantation
#9
Jillian S Y S Y, Zhi Mei Low, Iain Abbott, Lani Shochet, John Kanellis, Richard A Kitching, Tony M Korman
Epstein-Barr virus (EBV) is typically associated with post transplant lymphoproliferative disease (PTLD) after solid organ and stem cell transplantation. However, it is rarely associated with neurological complications. We report a case of severe encephalitis complicating primary EBV infection six months post renal transplantation, and review the literature on EBV encephalitis in solid organ transplantation in adults. A 55-year-old male presented 6 months post cadaveric renal transplant with headache, fever and confusion...
May 17, 2017: New Microbiologica
https://www.readbyqxmd.com/read/28506630/cost-effective-hiv-1-virological-monitoring-in-resource-limited-settings-using-a-modified-commercially-available-qpcr-rna-assay
#10
Jayaseelan Boobalan, Andrea Torti, Thongadi Ramesh Dinesha, Sunil Suhas Solomon, Pachamuthu Balakrishnan, Shanmugam Saravanan
Virological monitoring through plasma viral load (PVL) quantification is essential for clinical management of HIV patients undergoing antiretroviral treatment (ART), and for detecting treatment failure. Quantitative PCR (qPCR)-based tests are the gold standard for measuring PVL. Largely because of their high cost, however, implementation of these tests in low- and middle-income countries fails to cover the testing demand. In this study, we aimed at reducing the running cost of the commercially available Abbott RealTime™ HIV-1 assay by minimizing the reagent consumption...
May 12, 2017: Journal of Virological Methods
https://www.readbyqxmd.com/read/28505569/comparison-of-the-hologic-aptima-hiv-1-quant-dx-assay-to-the-roche-cobas-ampliprep-cobas-taqman-hiv-1-test-v2-0-for-the-quantification-of-hiv-1-rna-in-plasma-samples
#11
Kristian Schønning, Kim Johansen, Bodil Landt, Thomas Benfield, Henrik Westh
BACKGROUND: HIV-RNA is the most important parameter for monitoring antiviral treatment in individuals infected with HIV-1. Knowledge of the performance of different tests for the quantification of HIV-1 RNA is therefore important for clinical care. OBJECTIVES: To compare the analytical performance of the Aptima HIV-1 Quant Dx Assay (Aptima) and the COBAS Ampliprep/COBAS TaqMan HIV-1 Test v2.0 (CAPCTMv2) for the quantification of HIV-1 RNA in plasma samples. STUDY DESIGN: The performance of the two tests was compared on 216 clinical plasma samples, on dilutions series in seven replicates of five clinical samples of known subtype and on ten replicates of the Acrometrix High and Low Positive Control...
May 8, 2017: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/28499928/detection-of-ostreid-herpesvirus-1-microvariants-in-healthy-crassostrea-gigas-following-disease-events-and-their-possible-role-as-reservoirs-of-infection
#12
Olivia Evans, Paul Hick, Richard J Whittington
Ostreid herpesvirus-1 microvariants (OsHV-1) cause severe mortalities in farmed Crassostrea gigas in Europe, New Zealand and Australia. Outbreaks are seasonal, recurring in the warmer months of the year in endemic estuaries. The reference genotype and microvariant genotypes of OsHV-1 have been previously detected in the tissues of apparently healthy adult oysters naturally exposed to OsHV-1 in the field. However, the role of such oysters as reservoirs of infection for subsequent mortality outbreaks remains unclear...
May 9, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/28498985/hiv-antibodies-detect-hiv-persistence-and-low-level-viral-replication
#13
Sheila M Keating, Christopher D Pilcher, Vivek Jain, Mila Lebedeva, Dylan Hampton, Mohamed Abdel-Mohsen, Xutao Deng, Gary Murphy, Alex Welte, Shelley N Facente, Frederick Hecht, Steven G Deeks, Satish K Pillai, Michael P Busch
BACKGROUND: HIV antibodies are generated and maintained by ongoing systemic expression of HIV antigen. We investigated whether HIV antibody responses as measured by high-throughput quantitative and qualitative assays could be used to indirectly measure persistent HIV replication in individuals on antiretroviral therapy (ART). METHODS: HIV antibody measurements were made over time on and off suppressive ART and were compared to measures of HIV reservoir size and expression of anti-viral restriction factors...
May 11, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28495463/development-of-an-animal-model-of-progressive-vaccinia-in-nu-nu-mice-and-the-use-of-bioluminescence-imaging-for-assessment-of-the-efficacy-of-monoclonal-antibodies-against-vaccinial-b5-and-l1-proteins
#14
Marina Zaitseva, Antonia Thomas, Clement A Meseda, Charles Y K Cheung, Claudia G Diaz, Yan Xiang, Shane Crotty, Hana Golding
Bioluminescence imaging (BLI) was used to follow dissemination of recombinant vaccinia virus (VACV) expressing luciferase (IHD-J-Luc) in BALB/c nu/nu mice treated post-challenge with monoclonal antibodies (MAbs) against L1 and B5 VACV proteins in a model of Progressive Vaccinia (PV). Areas Under the flux Curve (AUC) were calculated for viral loads in multiple organs in individual mice. Following scarification with 10(5) pfu, IHD-J-Luc VACV undergoes fast replication at the injection site and disseminates rapidly to the inguinal lymph nodes followed by spleen, liver, and axillary lymph nodes within 2-3 days and before primary lesions are visible at the site of scarification...
May 8, 2017: Antiviral Research
https://www.readbyqxmd.com/read/28493279/specific-detection-of-gii-1-lineage-of-infectious-bronchitis-virus
#15
Katarzyna Domanska-Blicharz, Anna Lisowska, Anna Pikuła, Joanna Sajewicz-Krukowska
Infectious bronchitis virus (IBV) is a worldwide prevalent RNA virus that cause highly contagious and economically devastating disease in chicken. The virus exists in many different genetic forms which made the disease control very difficult. The present study describes the development and validation of TaqMan-probe-based real-time reverse transcription-polymerase chain reaction (real time RT-PCR) targeting the S1 coding region of S gene characteristic for the GII-1 lineage (formerly the D1466-like variant) of IBV...
May 10, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28489730/improved-hiv-1-viral-load-monitoring-capacity-using-pooled-testing-with-marker-assisted-deconvolution
#16
Tao Liu, Joseph W Hogan, Michael J Daniels, Mia Coetzer, Yizhen Xu, Gerald Bove, Allison K Delong, Lauren Ledingham, Millicent Orido, Lameck Diero, Rami Kantor
OBJECTIVE: Improve pooled viral load (VL) testing to increase HIV treatment monitoring capacity, particularly relevant for resource-limited settings. DESIGN: We developed mMPA (marker-assisted mini-pooling with algorithm), a new VL pooling deconvolution strategy that utilizes information from low-cost, routinely-collected clinical markers to determine an efficient order of sequential individual VL testing and dictates when the sequential testing can be stopped. METHODS: We simulated the use of pooled testing to ascertain virological failure status on 918 participants from three studies conducted at the Academic Model Providing Access to Healthcare (AMPATH) in Eldoret, Kenya, and estimated the number of assays needed when using mMPA and other pooling methods...
April 25, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/28489256/clinical-and-virologic-outcomes-in-high-risk-adult-ebv-mismatched-organ-transplant-recipients
#17
Deepali Kumar, Nikhil Patil, Shahid Husain, Cecilia Chaparro, Mamatha Bhat, S Joseph Kim, Atul Humar
EBV D+/R- organ transplant recipients are a high-risk group for developing PTLD. Little data are available for prevention in the adult EBV mismatched population. We conducted a retrospective study of EBV D+/R- organ transplants performed during 2002-2014. Of the 153 patients identified, 82.4% patients received antiviral prophylaxis with valganciclovir for a median of 4.5 months (range 0.8-22 months) and 36.6% underwent viral load monitoring in the first post-transplant year. EBV viremia developed in 67.2% monitored patients...
May 10, 2017: Clinical Transplantation
https://www.readbyqxmd.com/read/28480244/improving-tuberculosis-tb-and-human-immunodeficiency-virus-hiv-treatment-monitoring-in-south-africa-evaluation-of-an-advanced-tb-hiv-course-for-healthcare-workers
#18
Sean Galagan, Suzanne Jed, Jeri Sumitani, Jennifer M Gilvydis, Albert Bakor, Richard Cooke, Evasen Naidoo, Debra Winters, Marcia R Weaver
BACKGROUND: South Africa has dual epidemics of human immunodeficiency virus (HIV) and tuberculosis (TB). Nurse-focused training was combined with onsite mentoring for nurses to improve HIV and TB care. A pre-/postevaluation was conducted in 3 districts in South Africa to assess the effects of the course on clinical patient monitoring and integration of TB and HIV care. METHODS: Two cross-sectional, unmatched samples of patient charts at 76 primary healthcare facilities were collected retrospectively in 2014 to evaluate the impact of training on treatment monitoring...
2017: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/28475925/performance-evaluation-of-the-aptima-%C3%A2-hcv-quant-dx-assay-for-hepatitis-c-virus-hcv-rna-detection-and-quantification-in-comparison-to-the-abbott-realtime-hcv-assay
#19
Anna Rosa Garbuglia, Angela Bibbò, Roberta Sciamanna, Marina Pisciotta, Maria Rosaria Capobianchi
BACKGROUND: The Aptima HCV Quant Dx assay (Aptima) is a real-time transcription-mediated amplification assay CE-approved for the diagnosis and monitoring of hepatitis C virus (HCV) infection. OBJECTIVE: Aptima's analytical performance was compared to the Abbott RealTime HCV assay (RealTime) in a clinical routine setting. STUDY DESIGN: Overall 295 clinical plasma samples (117 prospective/fresh; 178 retrospective/frozen) from HCV-infected patients were tested in Aptima and RealTime to determine concordance on qualitative and quantitative results...
April 26, 2017: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/28475554/sustained-viral-suppression-in-hiv-infected-children-on-once-daily-lopinavir-ritonavir-in-clinical-practice
#20
Ivar P E Gondrie, Diane E T Bastiaans, Pieter L A Fraaij, Gertjan J A Driessen, Linda C Van Der Knaap, Eline G Visser, Petronette Van Jaarsveld, Ronald de Groot, Nico G Hartwig, David M Burger, Annemarie M C Van Rossum
BACKGROUND: The use of lopinavir/ritonavir once-daily (LPV/r QD) has not been approved for children. Good short-term clinical, virological and immunological outcomes have been observed in children on LPV/r QD. METHODS: We evaluated the long-term effectiveness of a LPV/r QD containing regimen in HIV-1 infected children in clinical practice. Selected children (aged 0-18 years) with an undetectable HIV-1 RNA viral load (<50 copies/mL) for at least 6 months on a twice-daily (BID) LPV/r-containing regimen switched to LPV/r QD...
May 4, 2017: Pediatric Infectious Disease Journal
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