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https://www.readbyqxmd.com/read/27933078/citrus-leprosis-virus-c-infection-results-in-hypersensitive-like-response-suppression-of-the-ja-et-plant-defense-pathway-and-promotion-of-the-colonization-of-its-mite-vector
#1
Gabriella D Arena, Pedro L Ramos-González, Maria A Nunes, Marcelo Ribeiro-Alves, Luis E A Camargo, Elliot W Kitajima, Marcos A Machado, Juliana Freitas-Astúa
Leprosis is a serious disease of citrus caused by Citrus leprosis virus C (CiLV-C, genus Cilevirus) whose transmission is mediated by false spider mites of the genus Brevipalpus. CiLV-C infection does not systemically spread in any of its known host plants, thus remaining restricted to local lesions around the feeding sites of viruliferous mites. To get insight into this unusual pathosystem, we evaluated the expression profiles of genes involved in defense mechanisms of Arabidopsis thaliana and Citrus sinensis upon infestation with non-viruliferous and viruliferous mites by using reverse-transcription qPCR...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27933051/short-interfering-rna-inhibits-rift-valley-fever-virus-replication-and-degradation-of-protein-kinase-r-in-human-cells
#2
Bonto Faburay, Juergen A Richt
Rift Valley fever virus (RVFV) is a mosquito-borne zoonotic pathogen causing severe outbreaks in humans and livestock in sub-Saharan Africa and the Arabian Peninsula. Human infections are characterized by fever, sometimes leading to encephalitis, retinitis, hemorrhagic fever, and occasionally death. There are currently no fully licensed vaccines or effective therapies for human use. Gene silencing mediated by double-stranded short interfering RNA (siRNA) is a sequence-specific, highly conserved mechanism in eukaryotes, which serves as an antiviral defense mechanism...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27932614/validation-of-the-cepheid-genexpert-for-detecting-ebola-virus-in-semen
#3
Amy James Loftis, Saturday Quellie, Kelly Chason, Emmanuel Sumo, Mason Toukolon, Yonnie Otieno, Heinzfried Ellerbrok, Marcia M Hobbs, David Hoover, Karine Dube, David A Wohl, William A Fischer
BACKGROUND: Ebola virus (EBOV) RNA persistence in semen, reported sexual transmission, and sporadic clusters at the end of the 2013-2016 epidemic have prompted recommendations that male survivors refrain from unprotected sex unless their semen is confirmed to be EBOV-free. However, there is no fully validated assay for EBOV detection in fluids other than blood. METHODS: The Cepheid Xpert Ebola assay for EBOV RNA detection was validated for whole semen and blood using samples obtained from uninfected donors and spiked with inactivated EBOV...
December 8, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27932311/daclatasvir-prevents-hepatitis-c-virus-by-blocking-transfer-of-viral-genome-to-assembly-sites
#4
Bertrand Boson, Solène Denolly, Fanny Turlure, Christophe Chamot, Marlène Dreux, François-Loïc Cosset
BACKGROUND & AIMS: Daclatasvir is a direct-acting antiviral agent and potent inhibitor of NS5A, which is involved in replication of the hepatitis C virus (HCV) genome, presumably via membranous web shaping, and assembly of new virions, likely via transfer of the HCV RNA genome to viral particle assembly sites. Daclatasvir inhibits the formation of new membranous web structures and, ultimately, of replication complex vesicles, but also inhibits an early assembly step. We investigated the relationship between daclatasvir-induced clustering of HCV proteins, intracellular localization of viral RNAs and inhibition of viral particle assembly...
December 5, 2016: Gastroenterology
https://www.readbyqxmd.com/read/27932111/hepatitis-c-virus-in-kidney-transplant-recipients-a-problem-on-the-path-to-eradication
#5
A Suarez Benjumea, C Gonzalez-Corvillo, J M Sousa, G Bernal Blanco, M Suñer Poblet, M A Perez Valdivia, F M Gonzalez Roncero, P Acevedo, M A Gentil Govantez
BACKGROUND: Hepatitis C virus (HCV) still has significant prevalence in kidney transplant (KT) recipients and is related to poor recipient and graft survival. New direct-acting antivirals (DAA) are leading to a radical change in the problem. METHODS: We studied HCV prevalence at the time of transplantation and in follow-up patients, the way cases are handled, and the results of DAA. RESULTS: A total of 2,001 KT had been performed in our center since 1978...
November 2016: Transplantation Proceedings
https://www.readbyqxmd.com/read/27930928/human-enterovirus-d68-in-clinical-and-sewage-samples-in-israel
#6
Merav Weil, Michal Mandelboim, Ella Mendelson, Yossi Manor, Lester Shulman, Daniela Ram, Galia Barkai, Yonat Shemer, Dana Wolf, Zipi Kra-Oz, Leah Weiss, Rakefet Pando, Musa Hindiyeh, Danit Sofer
BACKGROUND: Since mid-August 2014, North America experienced a wide outbreak of Enterovirus D68 (EV-D68) associated with severe respiratory illness in children. Several other countries also reported cases of EV-D68 in 2014. OBJECTIVES: The aim of this study was to determine whether EV-D68 circulated in Israel in 2014, caused severe respiratory illness in children and was the causative agent of Acute Flaccid Paralysis. STUDY DESIGN: Archived clinical respiratory samples from a cohort of 710 hospitalized pediatric patient's (<10years old) with respiratory illness were screened for clade B specific EV-D68 by real-time PCR...
November 30, 2016: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/27930588/three-cases-of-mumps-virus-and-enterovirus-coinfection-in-children-with-enteroviral-meningitis
#7
Mojtaba Rasti, Manoochehr Makvandi, Niloofar Neisi, Azarakhsh Azaran, Nasrin Rastegarvand, Davod Khalafkhany, Emad Jahangirnezhad, Ali Teimoori, Maryam Hadian, Abdolnabi Shabani, Ahmad Shamsizadeh, Roya Nikfar, Mehran Varnaseri
Several viruses are responsible for aseptic meningitis; however, in the region of Southwest Iran, the role played by each virus is still not very well known. The aim of this study is to determine the relative frequencies of mumps virus, herpes viruses, and enteroviruses, as well as coinfections among them, in patients with aseptic meningitis.In this cross-sectional study, samples of cerebrospinal fluid were collected between December 2012 and December 2013 from patients under 14 years, who were hospitalized in Abuzar Children's Hospital in Ahvaz, Southwest Iran (the only children's hospital in Khuzestan province and Southwest Iran)...
December 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27930559/sofosbuvir-and-ribavirin-in-acute-hepatitis-c-infected-patient-with-decompensated-cirrhosis
#8
Hui Liu, Tong Zhang, Yan Yan
BACKGROUND: The treatment of chronic hepatitis C virus infection has been revolutionized by the advent of direct-acting antiviral agents. However, evidence of its effects on patients with acute hepatitis C (AHC) virus infection is limited. CASE SUMMARY: We report the case of a patient with decompensated cirrhosis induced by autoimmune liver disease, whose condition rapidly deteriorated following AHC virus infection. The patient received sofosbuvir and ribavirin combination treatment for 12 weeks...
December 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27930325/development-of-high-yield-influenza-b-virus-vaccine-viruses
#9
Jihui Ping, Tiago J S Lopes, Gabriele Neumann, Yoshihiro Kawaoka
The burden of human infections with influenza A and B viruses is substantial, and the impact of influenza B virus infections can exceed that of influenza A virus infections in some seasons. Over the past few decades, viruses of two influenza B virus lineages (Victoria and Yamagata) have circulated in humans, and both lineages are now represented in influenza vaccines, as recommended by the World Health Organization. Influenza B virus vaccines for humans have been available for more than half a century, yet no systematic efforts have been undertaken to develop high-yield candidates...
December 5, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27929123/rnai-mediated-mortality-of-the-whitefly-through-transgenic-expression-of-double-stranded-rna-homologous-to-acetylcholinesterase-and-ecdysone-receptor-in-tobacco-plants
#10
Hassan Jamil Malik, Amir Raza, Imran Amin, Jodi A Scheffler, Brian E Scheffler, Judith K Brown, Shahid Mansoor
The whitefly Bemisia tabaci (Genn.) is a pest and vector of plant viruses to crop and ornamental plants worldwide. Using RNA interference (RNAi) to down regulate whitefly genes by expressing their homologous double stranded RNAs in plants has great potential for management of whiteflies to reduce plant virus disease spread. Using a Tobacco rattle virus-derived plasmid for in planta transient expression of double stranded RNA (dsRNA) homologous to the acetylcholinesterase (AChE) and ecdysone receptor (EcR) genes of B...
December 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27929099/stat1-is-essential-for-the-inhibition-of-hepatitis-c-virus-replication-by-interferon-%C3%AE-but-not-by-interferon-%C3%AE
#11
Shota Yamauchi, Kenji Takeuchi, Kazuyasu Chihara, Chisato Honjoh, Yuji Kato, Hatsumi Yoshiki, Hak Hotta, Kiyonao Sada
Interferon-α (IFN-α) and IFN-λ are structurally distinct cytokines that bind to different receptors, but induce expression of similar sets of genes through Janus kinase (JAK)-signal transducers and activators of transcription (STAT) pathways. The difference between IFN-α and IFN-λ signaling remains poorly understood. Here, using the CRISPR/Cas9 system, we examine the role of STAT1 and STAT2 in the inhibition of hepatitis C virus (HCV) replication by IFN-α and IFN-λ. Treatment with IFN-α increases expression of IFN-stimulated genes (ISGs) such as double-stranded RNA-activated protein kinase (PKR) and decreases viral RNA and protein levels in HCV-infected Huh-7...
December 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27928924/p22-of-tomato-chlorosis-virus-an-rna-silencing-suppressor-is-naturally-expressed-in-the-infected-plant
#12
R Zhao, N Wang, S Liu, K Ling, Z Fan, T Zhou
No abstract text is available yet for this article.
2016: Acta Virologica
https://www.readbyqxmd.com/read/27928918/characterization-and-phylogenetic-analysis-of-new-bat-astroviruses-detected-in-gabon-central-africa
#13
V Rougeron, E Suquet, G D Maganga, D Jiolle, I M Mombo, M Bourgarel, P Motsch, C Arnathau, P Durand, F Drexler, C Drosten, F Renaud, F Prugnolle, E M Leroy
Astroviruses are emerging RNA viruses that cause enteropathogenic infections in humans and in other mammals. The identification of astroviruses in a wide range of animals highlights the zoonotic importance of these viruses. Bats can harbor many different viruses, among which some are highly pathogenic for humans (for instance, Nipah, Ebola and SARS coronavirus), and also several astroviruses. As some RNA viruses can be directly transmitted from bats to humans, it is crucial to collect data about their frequency, genetic diversity and phylogenetic characterization...
2016: Acta Virologica
https://www.readbyqxmd.com/read/27928084/epidemiological-and-clinical-features-of-severe-fever-with-thrombocytopenia-syndrome-during-an-outbreak-in-south-korea-2013-2015
#14
Sun-Whan Park, Jungsang Ryou, Woo-Young Choi, Myung-Guk Han, Won-Ja Lee
Since the first reported case of severe fever with thrombocytopenia syndrome (SFTS) in South Korea in 2013, between 2013 and 2015, we collected 1,697 serum samples from suspected patients who experienced symptoms of SFTS. We performed reverse transcriptase polymerase chain reaction using total RNA extracted from the patients' sera. When viral RNA was detected in the sera, SFTS was diagnosed. Among the 1,697 samples, 170 were positive for SFTS virus. We then analyzed the epidemiologic features of these 170 cases...
December 7, 2016: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/27928012/emergence-of-a-viral-rna-polymerase-variant-during-gene-copy-number-amplification-promotes-rapid-evolution-of-vaccinia-virus
#15
Kelsey R Cone, Zev N Kronenberg, Mark Yandell, Nels C Elde
: Viruses are under relentless selective pressure from host immune defenses. To study how poxviruses adapt to innate immune detection pathways, we performed serial infections of vaccinia virus in primary human cells. Independent courses of experimental evolution with a recombinant strain lacking E3L revealed several high frequency point mutations in conserved poxvirus genes, suggesting important roles for essential poxvirus proteins in innate immune subversion. Two distinct mutations were identified in the viral RNA polymerase gene A24R, which seem to act through different mechanisms to increase virus replication...
December 7, 2016: Journal of Virology
https://www.readbyqxmd.com/read/27928005/amino-acid-mutations-in-the-ns4a-region-of-hepatitis-c-virus-contribute-to-viral-replication-and-infectious-virus-production
#16
Asako Murayama, Nao Sugiyama, Ryosuke Suzuki, Masaki Moriyama, Noriko Nakamura, Hidenori Mochizuki, Takaji Wakita, Takanobu Kato
: Hepatitis C Virus (HCV) strain JFH-1, which belongs to genotype 2a, replicates autonomously in cultured cells, whereas another genotype 2a strain, J6CF, does not. Previously, we found that replacing the NS3 helicase and NS5B-to-3' X regions of J6CF with those of JFH-1 confers J6CF replication competence. In this study, we aimed to identify the minimum modifications to establish replication-competent J6CF within these genomic regions. We previously identified 4 mutations in the NS5B-to-3' X region that confer J6CF replication competence instead of replacing of this region...
December 7, 2016: Journal of Virology
https://www.readbyqxmd.com/read/27927929/high-throughput-next-generation-sequencing-of-polioviruses
#17
Anna M Montmayeur, Terry Fei Fan Ng, Alexander Schmidt, Kun Zhao, Laura Magaña, Jane Iber, Christina J Castro, Qi Chen, Elizabeth Henderson, Edward Ramos, Jing Shaw, Roman L Tatusov, Naomi Dybdahl-Sissoko, Marie Claire Endegue-Zanga, Johnson A Adeniji, M Steven Oberste, Cara C Burns
Poliovirus (PV) is currently targeted for worldwide eradication and containment. Sanger-based sequencing of the VP1 capsid region is the current standard method for PV surveillance; however, the whole genome sequence is sometimes needed for higher resolution global surveillance. In this study, we optimized whole genome sequencing protocols for poliovirus isolates and FTA cards using NGS, aiming for high sequence coverage, efficiency, and throughput. We found that DNase treatment of poliovirus RNA followed by random RT, amplification, and the Nextera XT DNA Library Preparation Kit produced significantly better results than other preparations...
December 7, 2016: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/27927917/zika-virus-testing-considerations-lessons-learned-from-the-first-eighty-real-time-rt-pcr-positive-cases-diagnosed-in-new-york-state
#18
Kirsten St George, Inderbir S Sohi, Elizabeth M Dufort, Amy B Dean, Jennifer L White, Ronald Limberger, Jamie N Sommer, Stephanie Ostrowski, Susan J Wong, P Bryon Backenson, Daniel Kuhles, Debra Blog, Jill Taylor, Brad Hutton, Howard A Zucker
The performance and interpretation of laboratory tests for Zika virus (ZKV) continue to be evaluated. Serology is cross-reactive, laborious and frequently difficult to interpret and serum was initially solely recommended for molecular diagnosis. ZKV testing was initiated January 2016 in New York State for symptomatic patients, pregnant women, their infants, and patients with Guillain-Barré Syndrome, who traveled to areas with ZKV transmission. Subsequently, eligibility was expanded to pregnant women with sexual partners with similar travel history...
December 7, 2016: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/27927863/longitudinal-viral-dynamics-in-semen-during-early-hiv-infection
#19
Sheldon R Morris, Mitchell Zhao, Davey R Smith, Milenka V Vargas, Susan J Little, Sara Gianella
BACKGROUND: Multiple viruses co-infect the male genital tract, influencing each other's replication and perhaps affecting HIV pathogenesis and disease progression. METHODS: This study included 453 longitudinal seminal samples from 195 HIV-infected men from the San Diego Primary Infection Cohort and 67 seminal samples from HIV-negative healthy controls. Seminal HIV RNA and DNA from seven human herpesviruses (HHV) were measured by RT-PCR. Longitudinal shedding rates were determined by Kaplan-Meier survival analysis...
December 7, 2016: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/27926942/actin-related-protein-2-arp2-and-virus-induced-filopodia-facilitate-human-respiratory-syncytial-virus-spread
#20
Masfique Mehedi, Thomas McCarty, Scott E Martin, Cyril Le Nouën, Eugen Buehler, Yu-Chi Chen, Margery Smelkinson, Sundar Ganesan, Elizabeth R Fischer, Linda G Brock, Bo Liang, Shirin Munir, Peter L Collins, Ursula J Buchholz
Human respiratory syncytial virus (RSV) is an enveloped RNA virus that is the most important viral cause of acute pediatric lower respiratory tract illness worldwide, and lacks a vaccine or effective antiviral drug. The involvement of host factors in the RSV replicative cycle remains poorly characterized. A genome-wide siRNA screen in human lung epithelial A549 cells identified actin-related protein 2 (ARP2) as a host factor involved in RSV infection. ARP2 knockdown did not reduce RSV entry, and did not markedly reduce gene expression during the first 24 hr of infection, but decreased viral gene expression thereafter, an effect that appeared to be due to inhibition of viral spread to neighboring cells...
December 2016: PLoS Pathogens
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