Evidence to Support Safe Return to Clinical Practice
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The Koi Herpesvirus (Khv): an Alloherpesviru
Aquacu nd ltu a r e s e J Bergmann et al., Fish Aquac J 2016, 7:2 i o r u e r h n http://dx.doi.org/10.4172/2150-3508.1000169 s a i l F Fisheries and Aquaculture Journal ISSN: 2150-3508 ResearchResearch Artilce Article OpenOpen Access Access Is There Any Species Specificity in Infections with Aquatic Animal Herpesviruses?–The Koi Herpesvirus (KHV): An Alloherpesvirus Model Sven M Bergmann1*, Michael Cieslak1, Dieter Fichtner1, Juliane Dabels2, Sean J Monaghan3, Qing Wang4, Weiwei Zeng4 and Jolanta Kempter5 1FLI Insel Riems, Südufer 10, 17493 Greifswald-Insel Riems, Germany 2University of Rostock, Aquaculture and Sea Ranching, Justus-von-Liebig-Weg 6, Rostock 18059, Germany 3Aquatic Vaccine Unit, Institute of Aquaculture, School of Natural Sciences, University of Stirling, Stirling, FK9 4LA, UK 4Pearl-River Fisheries Research Institute, Xo. 1 Xingyu Reoad, Liwan District, Guangzhou 510380, P. R. of China 5West Pomeranian Technical University, Aquaculture, K. Królewicza 4, 71-550, Szczecin, Poland Abstract Most diseases induced by herpesviruses are host-specific; however, exceptions exist within the family Alloherpesviridae. Most members of the Alloherpesviridae are detected in at least two different species, with and without clinical signs of a disease. In the current study the Koi herpesvirus (KHV) was used as a model member of the Alloherpesviridae and rainbow trout as a model salmonid host, which were infected with KHV by immersion. KHV was detected using direct methods (qPCR and semi-nested PCR) and indirect (enzyme-linked immunosorbant assay; ELISA, serum neutralization test; SNT). The non-koi herpesvirus disease (KHVD)-susceptible salmonid fish were demonstrated to transfer KHV to naïve carp at two different temperatures including a temperature most suitable for the salmonid (15°C) and cyprinid (20°C). -
Nucleotide Amino Acid Size (Nt) #Orfs Marnavirus Heterosigma Akashiwo Heterosigma Akashiwo RNA Heterosigma Lang Et Al
Supplementary Table 1: Summary of information for all viruses falling within the seven Marnaviridae genera in our analyses. Accession Genome Genus Species Virus name Strain Abbreviation Source Country Reference Nucleotide Amino acid Size (nt) #ORFs Marnavirus Heterosigma akashiwo Heterosigma akashiwo RNA Heterosigma Lang et al. , 2004; HaRNAV AY337486 AAP97137 8587 One Canada RNA virus 1 virus akashiwo Tai et al. , 2003 Marine single- ASG92540 Moniruzzaman et Classification pending Q sR OV 020 KY286100 9290 Two celled USA ASG92541 al ., 2017 eukaryotes Marine single- Moniruzzaman et Classification pending Q sR OV 041 KY286101 ASG92542 9328 One celled USA al ., 2017 eukaryotes APG78557 Classification pending Wenzhou picorna-like virus 13 WZSBei69459 KX884360 9458 One Bivalve China Shi et al ., 2016 APG78557 Classification pending Changjiang picorna-like virus 2 CJLX30436 KX884547 APG79001 7171 One Crayfish China Shi et al ., 2016 Beihai picorna-like virus 57 BHHQ57630 KX883356 APG76773 8518 One Tunicate China Shi et al ., 2016 Classification pending Beihai picorna-like virus 57 BHJP51916 KX883380 APG76812 8518 One Tunicate China Shi et al ., 2016 Marine single- ASG92530 Moniruzzaman et Classification pending N OV 137 KY130494 7746 Two celled USA ASG92531 al ., 2017 eukaryotes Hubei picorna-like virus 7 WHSF7327 KX884284 APG78434 9614 One Pill worm China Shi et al ., 2016 Classification pending Hubei picorna-like virus 7 WHCC111241 KX884268 APG78407 7945 One Insect China Shi et al ., 2016 Sanxia atyid shrimp virus 2 WHCCII13331 KX884278 APG78424 10445 One Insect China Shi et al ., 2016 Classification pending Freshwater atyid Sanxia atyid shrimp virus 2 SXXX37884 KX883708 APG77465 10400 One China Shi et al ., 2016 shrimp Labyrnavirus Aurantiochytrium single Aurantiochytrium single stranded BAE47143 Aurantiochytriu AuRNAV AB193726 9035 Three4 Japan Takao et al. -
Comparative Evolutionary and Phylogenomic Analysis of Avian Avulaviruses 1 to 20
Accepted Manuscript Comparative evolutionary and phylogenomic analysis of Avian avulaviruses 1 to 20 Aziz-ul-Rahman, Muhammad Munir, Muhammad Zubair Shabbir PII: S1055-7903(17)30947-8 DOI: https://doi.org/10.1016/j.ympev.2018.06.040 Reference: YMPEV 6223 To appear in: Molecular Phylogenetics and Evolution Received Date: 1 January 2018 Revised Date: 15 May 2018 Accepted Date: 25 June 2018 Please cite this article as: Aziz-ul-Rahman, Munir, M., Zubair Shabbir, M., Comparative evolutionary and phylogenomic analysis of Avian avulaviruses 1 to 20, Molecular Phylogenetics and Evolution (2018), doi: https:// doi.org/10.1016/j.ympev.2018.06.040 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Comparative evolutionary and phylogenomic analysis of Avian avulaviruses 1 to 20 Aziz-ul-Rahman1,3, Muhammad Munir2, Muhammad Zubair Shabbir3# 1Department of Microbiology University of Veterinary and Animal Sciences, Lahore 54600, Pakistan https://orcid.org/0000-0002-3342-4462 2Division of Biomedical and Life Sciences, Furness College, Lancaster University, Lancaster LA1 4YG United Kingdomhttps://orcid.org/0000-0003-4038-0370 3 Quality Operations Laboratory University of Veterinary and Animal Sciences 54600 Lahore, Pakistan https://orcid.org/0000-0002-3562-007X # Corresponding author: Muhammad Zubair Shabbir E. -
2020 Taxonomic Update for Phylum Negarnaviricota (Riboviria: Orthornavirae), Including the Large Orders Bunyavirales and Mononegavirales
Archives of Virology https://doi.org/10.1007/s00705-020-04731-2 VIROLOGY DIVISION NEWS 2020 taxonomic update for phylum Negarnaviricota (Riboviria: Orthornavirae), including the large orders Bunyavirales and Mononegavirales Jens H. Kuhn1 · Scott Adkins2 · Daniela Alioto3 · Sergey V. Alkhovsky4 · Gaya K. Amarasinghe5 · Simon J. Anthony6,7 · Tatjana Avšič‑Županc8 · María A. Ayllón9,10 · Justin Bahl11 · Anne Balkema‑Buschmann12 · Matthew J. Ballinger13 · Tomáš Bartonička14 · Christopher Basler15 · Sina Bavari16 · Martin Beer17 · Dennis A. Bente18 · Éric Bergeron19 · Brian H. Bird20 · Carol Blair21 · Kim R. Blasdell22 · Steven B. Bradfute23 · Rachel Breyta24 · Thomas Briese25 · Paul A. Brown26 · Ursula J. Buchholz27 · Michael J. Buchmeier28 · Alexander Bukreyev18,29 · Felicity Burt30 · Nihal Buzkan31 · Charles H. Calisher32 · Mengji Cao33,34 · Inmaculada Casas35 · John Chamberlain36 · Kartik Chandran37 · Rémi N. Charrel38 · Biao Chen39 · Michela Chiumenti40 · Il‑Ryong Choi41 · J. Christopher S. Clegg42 · Ian Crozier43 · John V. da Graça44 · Elena Dal Bó45 · Alberto M. R. Dávila46 · Juan Carlos de la Torre47 · Xavier de Lamballerie38 · Rik L. de Swart48 · Patrick L. Di Bello49 · Nicholas Di Paola50 · Francesco Di Serio40 · Ralf G. Dietzgen51 · Michele Digiaro52 · Valerian V. Dolja53 · Olga Dolnik54 · Michael A. Drebot55 · Jan Felix Drexler56 · Ralf Dürrwald57 · Lucie Dufkova58 · William G. Dundon59 · W. Paul Duprex60 · John M. Dye50 · Andrew J. Easton61 · Hideki Ebihara62 · Toufc Elbeaino63 · Koray Ergünay64 · Jorlan Fernandes195 · Anthony R. Fooks65 · Pierre B. H. Formenty66 · Leonie F. Forth17 · Ron A. M. Fouchier48 · Juliana Freitas‑Astúa67 · Selma Gago‑Zachert68,69 · George Fú Gāo70 · María Laura García71 · Adolfo García‑Sastre72 · Aura R. Garrison50 · Aiah Gbakima73 · Tracey Goldstein74 · Jean‑Paul J. Gonzalez75,76 · Anthony Grifths77 · Martin H. Groschup12 · Stephan Günther78 · Alexandro Guterres195 · Roy A. -
Computational Exploration of Virus Diversity on Transcriptomic Datasets
Computational Exploration of Virus Diversity on Transcriptomic Datasets Digitaler Anhang der Dissertation zur Erlangung des Doktorgrades (Dr. rer. nat.) der Mathematisch-Naturwissenschaftlichen Fakultät der Rheinischen Friedrich-Wilhelms-Universität Bonn vorgelegt von Simon Käfer aus Andernach Bonn 2019 Table of Contents 1 Table of Contents 1 Preliminary Work - Phylogenetic Tree Reconstruction 3 1.1 Non-segmented RNA Viruses ........................... 3 1.2 Segmented RNA Viruses ............................. 4 1.3 Flavivirus-like Superfamily ............................ 5 1.4 Picornavirus-like Viruses ............................. 6 1.5 Togavirus-like Superfamily ............................ 7 1.6 Nidovirales-like Viruses .............................. 8 2 TRAVIS - True Positive Details 9 2.1 INSnfrTABRAAPEI-14 .............................. 9 2.2 INSnfrTADRAAPEI-16 .............................. 10 2.3 INSnfrTAIRAAPEI-21 ............................... 11 2.4 INSnfrTAORAAPEI-35 .............................. 13 2.5 INSnfrTATRAAPEI-43 .............................. 14 2.6 INSnfrTBERAAPEI-19 .............................. 15 2.7 INSytvTABRAAPEI-11 .............................. 16 2.8 INSytvTALRAAPEI-35 .............................. 17 2.9 INSytvTBORAAPEI-47 .............................. 18 2.10 INSswpTBBRAAPEI-21 .............................. 19 2.11 INSeqtTAHRAAPEI-88 .............................. 20 2.12 INShkeTCLRAAPEI-44 .............................. 22 2.13 INSeqtTBNRAAPEI-11 .............................. 23 2.14 INSeqtTCJRAAPEI-20 -
Beet Curly Top Virus Strains Associated with Sugar Beet in Idaho, Oregon, and a Western U.S
Plant Disease • 2017 • 101:1373-1382 • http://dx.doi.org/10.1094/PDIS-03-17-0381-RE Beet curly top virus Strains Associated with Sugar Beet in Idaho, Oregon, and a Western U.S. Collection Carl A. Strausbaugh and Imad A. Eujayl, United States Department of Agriculture–Agricultural Research Service (USDA-ARS) Northwest Irrigation and Soils Research Laboratory, Kimberly, ID 83341; and William M. Wintermantel, USDA-ARS, Salinas, CA 93905 Abstract Curly top of sugar beet is a serious, yield-limiting disease in semiarid pro- Logan) strains and primers that amplified a group of Worland (Wor)- duction areas caused by Beet curly top virus (BCTV) and transmitted like strains. The BCTV strain distribution averaged 2% Svr, 30% CA/ by the beet leafhopper. One of the primary means of control for BCTV Logan, and 87% Wor-like (16% had mixed infections), which differed in sugar beet is host resistance but effectiveness of resistance can vary from the previously published 2006-to-2007 collection (87% Svr, 7% among BCTV strains. Strain prevalence among BCTV populations CA/Logan, and 60% Wor-like; 59% mixed infections) based on a contin- was last investigated in Idaho and Oregon during a 2006-to-2007 collec- gency test (P < 0.0001). Whole-genome sequencing (GenBank acces- tion but changes in disease severity suggested a need for reevaluation. sions KT276895 to KT276920 and KX867015 to KX867057) with Therefore, 406 leaf samples symptomatic for curly top were collected overlapping primers found that the Wor-like strains included Wor, Colo- from sugar beet plants in commercial sugar beet fields in Idaho and rado and a previously undescribed strain designated Kimberly1. -
Differential Features of Fusion Activation Within the Paramyxoviridae
viruses Review Differential Features of Fusion Activation within the Paramyxoviridae Kristopher D. Azarm and Benhur Lee * Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; [email protected] * Correspondence: [email protected]; Tel.: +1-212-241-2552 Received: 17 December 2019; Accepted: 29 January 2020; Published: 30 January 2020 Abstract: Paramyxovirus (PMV) entry requires the coordinated action of two envelope glycoproteins, the receptor binding protein (RBP) and fusion protein (F). The sequence of events that occurs during the PMV entry process is tightly regulated. This regulation ensures entry will only initiate when the virion is in the vicinity of a target cell membrane. Here, we review recent structural and mechanistic studies to delineate the entry features that are shared and distinct amongst the Paramyxoviridae. In general, we observe overarching distinctions between the protein-using RBPs and the sialic acid- (SA-) using RBPs, including how their stalk domains differentially trigger F. Moreover, through sequence comparisons, we identify greater structural and functional conservation amongst the PMV fusion proteins, as compared to the RBPs. When examining the relative contributions to sequence conservation of the globular head versus stalk domains of the RBP, we observe that, for the protein-using PMVs, the stalk domains exhibit higher conservation and find the opposite trend is true for SA-using PMVs. A better understanding of conserved and distinct features that govern the entry of protein-using versus SA-using PMVs will inform the rational design of broader spectrum therapeutics that impede this process. Keywords: paramyxovirus; viral envelope proteins; type I fusion protein; henipavirus; virus entry; viral transmission; structure; rubulavirus; parainfluenza virus 1. -
Ocorrência Natural De Espécies Virais E Avaliação De Potenciais Hospedeiras Experimentais De Begomovírus, Potyvírus E Tospovírus Em Plantas Arbóreas E Berinjela
UNIVERSIDADE DE BRASÍLIA INSTITUTO DE CIÊNCIAS BIOLÓGICAS DEPARTAMENTO DE FITOPATOLOGIA PROGRAMA DE PÓS-GRADUAÇÃO EM FITOPATOLOGIA Ocorrência natural de espécies virais e avaliação de potenciais hospedeiras experimentais de begomovírus, potyvírus e tospovírus em plantas arbóreas e berinjela (Solanum melongena) JOSIANE GOULART BATISTA Brasília - DF 2014 JOSIANE GOULART BATISTA Ocorrência natural de espécies virais e avaliação de potenciais hospedeiras experimentais de begomovírus, potyvírus e tospovírus em plantas arbóreas e berinjela (Solanum melongena) Dissertação apresentada à Universidade de Brasília como requisito parcial para a obtenção do título de Mestre em Fitopatologia pelo Programa de Pós Graduação em Fitopatologia. Orientadora Dra. Rita de Cássia Pereira Carvalho BRASÍLIA DISTRITO FEDERAL – BRASIL 2014 FICHA CATALOGRÁFICA Batista, G.J. Ocorrência natural de espécies virais e avaliação de potenciais hospedeiras experimentais de begomovírus, potyvírus e tospovírus em plantas arbóreas e berinjela (Solanum melongena). Josiane Goulart Batista. Brasília, 2014 Número de páginas p.: 183 Dissertação de mestrado - Programa de Pós-Graduação em Fitopatologia, Universidade de Brasília, Brasília. Árvores, berinjela, vírus, resistência. I. Universidade de Brasília. PPG/FIT. II. Título. Ocorrência natural de espécies virais e avaliação de potenciais hospedeiras experimentais de begomovírus, potyvírus e tospovírus em plantas arbóreas e berinjela (Solanum melongena). Dedico a minha pequena linda filha Giovanna, ao meu pai Josvaldo, a minha mãe Nelma, ao meu namorado Airton, a minha irmã Josefa e minha sobrinha Júlia. Agradecimentos A Deus. Aos meus pais Josvaldo e Nelma. A minha filha Giovanna, minha irmã Josefa e minha sobrinha Júlia. A minha orientadora Professora Rita de Cássia. Aos colegas do mestrado e doutorado Rafaela, Marcella, Juliana, Ícaro, Cléia, Monica, Elenice, William, Rayane e Nédio. -
Elucidating Viral Communities During a Phytoplankton Bloom on the West Antarctic Peninsula
fmicb-10-01014 May 10, 2019 Time: 14:46 # 1 ORIGINAL RESEARCH published: 14 May 2019 doi: 10.3389/fmicb.2019.01014 Elucidating Viral Communities During a Phytoplankton Bloom on the West Antarctic Peninsula Tomás Alarcón-Schumacher1,2†, Sergio Guajardo-Leiva1†, Josefa Antón3 and Beatriz Díez1,4* 1 Department of Molecular Genetics and Microbiology, Pontificia Universidad Católica de Chile, Santiago, Chile, 2 Max Planck Institute for Marine Microbiology, Bremen, Germany, 3 Department of Physiology, Genetics, and Microbiology, University of Alicante, Alicante, Spain, 4 Center for Climate and Resilience Research (CR2), University of Chile, Santiago, Chile In Antarctic coastal waters where nutrient limitations are low, viruses are expected to play a major role in the regulation of bloom events. Despite this, research in viral identification and dynamics is scarce, with limited information available for the Southern Ocean (SO). This study presents an integrative-omics approach, comparing variation in the viral and microbial active communities on two contrasting sample conditions from Edited by: a diatom-dominated phytoplankton bloom occurring in Chile Bay in the West Antarctic David Velazquez, Autonomous University of Madrid, Peninsula (WAP) in the summer of 2014. The known viral community, initially dominated Spain by Myoviridae family (∼82% of the total assigned reads), changed to become dominated Reviewed by: by Phycodnaviridae (∼90%), while viral activity was predominantly driven by dsDNA Carole Anne Llewellyn, ∼ ∼ Swansea University, United Kingdom members of the Phycodnaviridae ( 50%) and diatom infecting ssRNA viruses ( 38%), Márcio Silva de Souza, becoming more significant as chlorophyll a increased. A genomic and phylogenetic Fundação Universidade Federal do characterization allowed the identification of a new viral lineage within the Myoviridae Rio Grande, Brazil family. -
1/11 FACULTAD DE VETERINARIA GRADO DE VETERINARIA Curso
FACULTAD DE VETERINARIA GRADO DE VETERINARIA Curso 2015/16 Asignatura: MICROBIOLOGÍA E INMUNOLOGÍA DENOMINACIÓN DE LA ASIGNATURA Denominación: MICROBIOLOGÍA E INMUNOLOGÍA Código: 101463 Plan de estudios: GRADO DE VETERINARIA Curso: 2 Denominación del módulo al que pertenece: FORMACIÓN BÁSICA COMÚN Materia: MICROBIOLOGÍA E INMUNOLOGÍA Carácter: BASICA Duración: ANUAL Créditos ECTS: 12 Horas de trabajo presencial: 120 Porcentaje de presencialidad: 40% Horas de trabajo no presencial: 180 Plataforma virtual: UCO MOODLE DATOS DEL PROFESORADO __ Nombre: GARRIDO JIMENEZ, MARIA ROSARIO (Coordinador) Centro: Veterinaria Departamento: SANIDAD ANIMAL área: SANIDAD ANIMAL Ubicación del despacho: Edificio Sanidad Animal 3ª Planta E-Mail: [email protected] Teléfono: 957218718 _ Nombre: SERRANO DE BURGOS, ELENA (Coordinador) Centro: Veterinaria Departamento: SANIDAD ANIMAL área: SANIDAD ANIMAL Ubicación del despacho: Edificio Sanidad Animal 3ª Planta E-Mail: [email protected] Teléfono: 957218718 _ Nombre: HUERTA LORENZO, MARIA BELEN Centro: Veterianaria Departamento: SANIDAD ANIMAL área: SANIDAD ANIMAL Ubicación del despacho: Edificio Sanidad Animal 2ª Planta E-Mail: [email protected] Teléfono: 957212635 _ DATOS ESPECÍFICOS DE LA ASIGNATURA REQUISITOS Y RECOMENDACIONES Requisitos previos establecidos en el plan de estudios Ninguno Recomendaciones 1/11 MICROBIOLOGÍA E INMUNOLOGÍA Curso 2015/16 Se recomienda haber cursado las asignaturas de Biología Molecular Animal y Vegetal, Bioquímica, Citología e Histología y Anatomía Sistemática. COMPETENCIAS CE23 Estudio de los microorganismos que afectan a los animales y de aquellos que tengan una aplicación industrial, biotecnológica o ecológica. CE24 Bases y aplicaciones técnicas de la respuesta inmune. OBJETIVOS Los siguientes objetivos recogen las recomendaciones de la OIE para la formación del veterinario: 1. Abordar el concepto actual de Microbiología e Inmunología, la trascendencia de su evolución histórica y las líneas de interés o investigación futuras. -
The Dsrna Virus Papaya Meleira Virus and an Ssrna Virus Are Associated with Papaya Sticky Disease
RESEARCH ARTICLE The dsRNA Virus Papaya Meleira Virus and an ssRNA Virus Are Associated with Papaya Sticky Disease Tathiana Ferreira Sá Antunes1, Raquel J. Vionette Amaral1, José Aires Ventura1,2, Marcio Tadeu Godinho3, Josiane G. Amaral3, Flávia O. Souza4, Poliane Alfenas Zerbini4, Francisco Murilo Zerbini3, Patricia Machado Bueno Fernandes1* 1 Núcleo de Biotecnologia, Universidade Federal do Espírito Santo, Vitória, Espírito Santo, Brazil, 2 Instituto Capixaba de Pesquisa, Assistência Técnica e Extensão Rural, Vitória, Espírito Santo, Brazil, 3 Dep. de Fitopatologia/BIOAGRO, Universidade Federal de Viçosa, 36570–900, Viçosa, Minas Gerais, Brazil, 4 Dep. a11111 de Microbiologia/BIOAGRO, Universidade Federal de Viçosa, 36570–900, Viçosa, Minas Gerais, Brazil * [email protected] Abstract OPEN ACCESS Papaya sticky disease, or “meleira”, is one of the major diseases of papaya in Brazil and Citation: Sá Antunes TF, Amaral RJV, Ventura JA, Mexico, capable of causing complete crop loss. The causal agent of sticky disease was Godinho MT, Amaral JG, Souza FO, et al. (2016) The identified as an isometric virus with a double stranded RNA (dsRNA) genome, named dsRNA Virus Papaya Meleira Virus and an ssRNA papaya meleira virus (PMeV). In the present study, PMeV dsRNA and a second RNA band Virus Are Associated with Papaya Sticky Disease. PLoS ONE 11(5): e0155240. doi:10.1371/journal. of approximately 4.5 kb, both isolated from latex of papaya plants with severe symptoms of pone.0155240 sticky disease, were deep-sequenced. The nearly complete sequence obtained for PMeV Editor: Rogerio Margis, Universidade Federal do Rio dsRNA is 8,814 nucleotides long and contains two putative ORFs; the predicted ORF1 and Grande do Sul, BRAZIL ORF2 display similarity to capsid proteins and RdRp's, respectively, from mycoviruses ten- Totiviridae Received: January 4, 2016 tatively classified in the family . -
Virus World As an Evolutionary Network of Viruses and Capsidless Selfish Elements
Virus World as an Evolutionary Network of Viruses and Capsidless Selfish Elements Koonin, E. V., & Dolja, V. V. (2014). Virus World as an Evolutionary Network of Viruses and Capsidless Selfish Elements. Microbiology and Molecular Biology Reviews, 78(2), 278-303. doi:10.1128/MMBR.00049-13 10.1128/MMBR.00049-13 American Society for Microbiology Version of Record http://cdss.library.oregonstate.edu/sa-termsofuse Virus World as an Evolutionary Network of Viruses and Capsidless Selfish Elements Eugene V. Koonin,a Valerian V. Doljab National Center for Biotechnology Information, National Library of Medicine, Bethesda, Maryland, USAa; Department of Botany and Plant Pathology and Center for Genome Research and Biocomputing, Oregon State University, Corvallis, Oregon, USAb Downloaded from SUMMARY ..................................................................................................................................................278 INTRODUCTION ............................................................................................................................................278 PREVALENCE OF REPLICATION SYSTEM COMPONENTS COMPARED TO CAPSID PROTEINS AMONG VIRUS HALLMARK GENES.......................279 CLASSIFICATION OF VIRUSES BY REPLICATION-EXPRESSION STRATEGY: TYPICAL VIRUSES AND CAPSIDLESS FORMS ................................279 EVOLUTIONARY RELATIONSHIPS BETWEEN VIRUSES AND CAPSIDLESS VIRUS-LIKE GENETIC ELEMENTS ..............................................280 Capsidless Derivatives of Positive-Strand RNA Viruses....................................................................................................280