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https://www.readbyqxmd.com/read/28192046/distribution-and-seasonal-variation-of-ljungan-virus-in-bank-voles-myodes-glareolus-in-fennoscandia
#1
Cristina Fevola, Chiara Rossi, Roberto Rosà, Åke Nordström, Frauke Ecke, Magnus Magnusson, Andrea L Miller, Jukka Niemimaa, Gert E Olsson, Anne J Jääskeläinen, Birger Hörnfeldt, Heikki Henttonen, Heidi C Hauffe
Ljungan virus (LV) is a picornavirus originally isolated from Swedish bank voles ( Myodes glareolus ) in 1998. The association of LV with human disease has been debated ever since, but fundamental data on the ecology of the virus are still lacking. Here we present results of the first intensive study on the prevalence of LV in bank voles trapped in Fennoscandia (Sweden and Finland) from 2009-2012 as determined by PCR. Using an LV-specific RT-PCR, LV was detected in the liver of 73 out of 452 (16.2%) individuals and in 13 out of 17 sampling sites across Sweden and Finland (mean per site prevalence 16%, SE 3%, range 0-50%)...
February 13, 2017: Journal of Wildlife Diseases
https://www.readbyqxmd.com/read/28093611/a-highly-divergent-puumala-virus-lineage-in-southern-poland
#2
Ulrike M Rosenfeld, Stephan Drewes, Hanan Sheikh Ali, Edyta T Sadowska, Magdalena Mikowska, Gerald Heckel, Paweł Koteja, Rainer G Ulrich
Puumala virus (PUUV) represents one of the most important hantaviruses in Central Europe. Phylogenetic analyses of PUUV strains indicate a strong genetic structuring of this hantavirus. Recently, PUUV sequences were identified in the natural reservoir, the bank vole (Myodes glareolus), collected in the northern part of Poland. The objective of this study was to evaluate the presence of PUUV in bank voles from southern Poland. A total of 72 bank voles were trapped in 2009 at six sites in this part of Poland...
January 16, 2017: Archives of Virology
https://www.readbyqxmd.com/read/28070280/surviving-winter-food-but-not-habitat-structure-prevents-crashes-in-cyclic-vole-populations
#3
Kaja Johnsen, Rudy Boonstra, Stan Boutin, Olivier Devineau, Charles J Krebs, Harry P Andreassen
Vole population cycles are a major force driving boreal ecosystem dynamics in northwestern Eurasia. However, our understanding of the impact of winter on these cycles is increasingly uncertain, especially because climate change is affecting snow predictability, quality, and abundance. We examined the role of winter weather and snow conditions, the lack of suitable habitat structure during freeze-thaw periods, and the lack of sufficient food as potential causes for winter population crashes. We live-trapped bank voles Myodes glareolus on 26 plots (0...
January 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/27983499/host-associated-absence-of-human-puumala-virus-infections-in-northern-and-eastern-germany
#4
Stephan Drewes, Hanan Sheikh Ali, Moritz Saxenhofer, Ulrike M Rosenfeld, Florian Binder, Fabian Cuypers, Mathias Schlegel, Susanne Röhrs, Gerald Heckel, Rainer G Ulrich
Human hantavirus disease cases, caused by Puumala virus (PUUV), are mainly recorded in western and southern areas of Germany. This bank vole reservoir survey confirmed PUUV presence in these regions but its absence in northern and eastern regions. PUUV occurrence is associated with the presence of the Western bank vole phylogroup.
January 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/27966215/behavioural-responses-of-ixodes-ricinus-nymphs-to-carbon-dioxide-and-rodent-odour
#5
G VAN Duijvendijk, G Gort, H Sprong, W Takken
Many haematophagous ectoparasites use carbon dioxide (CO2 ) and host odour to detect and locate their hosts. The tick Ixodes ricinus (Linnaeus) (Ixodida: Ixodidae) walks only small distances and quests in vegetation until it encounters a host. The differential effects of CO2 and host odour on the host-finding behaviour of I. ricinus have, however, never been clarified and hence represent the subject of this study. The effects of CO2 and odour from bank voles on the activation and attraction of I. ricinus nymphs were analysed in a Y-tube olfactometer...
December 14, 2016: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/27956196/microevolution-of-bank-voles-myodes-glareolus-at-neutral-and-immune-related-genes-during-multiannual-dynamic-cycles-consequences-for-puumala-hantavirus-epidemiology
#6
Adelaïde Dubois, Maxime Galan, Jean-François Cosson, Bertrand Gauffre, Heikki Henttonen, Jukka Niemimaa, Maria Razzauti, Liina Voutilainen, Renaud Vitalis, Emmanuel Guivier, Nathalie Charbonnel
Understanding how host dynamics, including variations of population size and dispersal, may affect the epidemiology of infectious diseases through ecological and evolutionary processes is an active research area. Here we focus on a bank vole (Myodes glareolus) metapopulation surveyed in Finland between 2005 and 2009. Bank vole is the reservoir of Puumala hantavirus (PUUV), the agent of nephropathia epidemica (NE, a mild form of hemorrhagic fever with renal symptom) in humans. M. glareolus populations experience multiannual density fluctuations that may influence the level of genetic diversity maintained in bank voles, PUUV prevalence and NE occurrence...
December 9, 2016: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/27918151/reservoir-driven-heterogeneous-distribution-of-recorded-human-puumala-virus-cases-in-south-west-germany
#7
S Drewes, H Turni, U M Rosenfeld, A Obiegala, P Straková, C Imholt, E Glatthaar, K Dressel, M Pfeffer, J Jacob, C Wagner-Wiening, R G Ulrich
Endemic regions for Puumala virus (PUUV) are located in the most affected federal state Baden-Wuerttemberg, South-West Germany, where high numbers of notified human hantavirus disease cases have been occurring for a long time. The distribution of human cases in Baden-Wuerttemberg is, however, heterogeneous, with a high number of cases recorded during 2012 in four districts (H districts) but a low number or even no cases recorded in four other districts (L districts). Bank vole monitoring during 2012, following a beech (Fagus sylvatica) mast year, resulted in the trapping of 499 bank voles, the host of PUUV...
December 5, 2016: Zoonoses and Public Health
https://www.readbyqxmd.com/read/27892798/transmissibility-of-gerstmann-str%C3%A3-ussler-scheinker-syndrome-in-rodent-models-new-insights-into-the-molecular-underpinnings-of-prion-infectivity
#8
Romolo Nonno, Michele Angelo Di Bari, Umberto Agrimi, Laura Pirisinu
Prion diseases, or transmissible spongiform encephalopathies, have revealed the bewildering phenomenon of transmissibility in neurodegenerative diseases. Hence, the experimental transmissibility of prion-like neurodegenerative diseases via template directed misfolding has become the focus of intense research. Gerstmann-Sträussler-Scheinker disease (GSS) is an inherited prion disease associated with mutations in the prion protein gene. However, with the exception of a few GSS cases with P102L mutation characterized by co-accumulation of protease-resistant PrP core (PrP(res)) of ∼21 kDa, attempts to transmit to rodents GSS associated to atypical misfolded prion protein with ∼8 kDa PrP(res) have been unsuccessful...
November 2016: Prion
https://www.readbyqxmd.com/read/27880822/isolation-of-a-defective-prion-mutant-from-natural-scrapie
#9
Ilaria Vanni, Sergio Migliore, Gian Mario Cosseddu, Michele Angelo Di Bari, Laura Pirisinu, Claudia D'Agostino, Geraldina Riccardi, Umberto Agrimi, Romolo Nonno
It is widely known that prion strains can mutate in response to modification of the replication environment and we have recently reported that prion mutations can occur in vitro during amplification of vole-adapted prions by Protein Misfolding Cyclic Amplification on bank vole substrate (bvPMCA). Here we exploited the high efficiency of prion replication by bvPMCA to study the in vitro propagation of natural scrapie isolates. Although in vitro vole-adapted PrPSc conformers were usually similar to the sheep counterpart, we repeatedly isolated a PrPSc mutant exclusively when starting from extremely diluted seeds of a single sheep isolate...
November 2016: PLoS Pathogens
https://www.readbyqxmd.com/read/27858312/isolation-and-complete-genome-characterization-of-novel-reassortant-orthoreovirus-from-common-vole-microtus-arvalis
#10
Enikő Fehér, Gábor Kemenesi, Miklós Oldal, Kornélia Kurucz, Renáta Kugler, Szilvia L Farkas, Szilvia Marton, Győző Horváth, Krisztián Bányai, Ferenc Jakab
A novel mammalian orthoreovirus (MRV) strain was isolated from the lung tissue of a common vole (Microtus arvalis) with Tula hantavirus infection. Seven segments (L1-L3, M2-M3, S2, and S4) of the Hungarian MRV isolate MORV/47Ma/06 revealed a high similarity with an MRV strain detected in bank vole (Myodes glareolus) in Germany. The M1 and S3 segment of the Hungarian isolate showed the closest relationship with the sequence of a Slovenian human and a French murine isolate, respectively. The highest nucleotide and amino acid identity values were above 90 and 95% in all of the comparisons to the reference sequences in GenBank, except for the S1 with a maximum of 69...
November 17, 2016: Virus Genes
https://www.readbyqxmd.com/read/27854567/metagenomic-evaluation-of-bacteria-from-voles
#11
Katja A Koskela, Laura Kalin-Mänttäri, Heidi Hemmilä, Teemu Smura, Paula M Kinnunen, Jukka Niemimaa, Heikki Henttonen, Simo Nikkari
Voles (Arvicolinae, Rodentia) are known carriers of zoonotic bacteria such as Bartonella spp. and Francisella tularensis. However, apart from F. tularensis, the bacterial microbiome of voles has not previously been determined in Finland and rarely elsewhere. Therefore, we studied liver samples from 61 voles using 16S ribosomal RNA gene PCR analysis, followed by Sanger sequencing. Twenty-three of these samples were also studied with tag-encoded pyrosequencing. The samples originated from 21 field voles (Microtus agrestis), 37 tundra voles (Microtus oeconomus), and 3 bank voles (Myodes glareolus)...
February 2017: Vector Borne and Zoonotic Diseases
https://www.readbyqxmd.com/read/27815157/excretion-and-measurement-of-corticosterone-and-testosterone-metabolites-in-bank-voles-myodes-glareolus
#12
Saana Sipari, Hannu Ylönen, Rupert Palme
The bank vole is a commonly used model species in behavioral and ecophysiological studies. Thus, presenting a validated method for noninvasive monitoring of corticosterone and testosterone secretion is of high relevance. Here, we evaluated the effect of time of day and an ACTH challenge test on measured fecal corticosterone (FCM) and testosterone (FTM) metabolites in both sexes. Furthermore, we performed radiometabolism experiments for both steroids and sexes to study metabolism and excretion of (3)H-corticosterone and (3)H-testosterone...
November 1, 2016: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/27806736/validation-of-the-puumala-virus-rapid-field-test-for-bank-voles-in-germany
#13
D Reil, C Imholt, U M Rosenfeld, S Drewes, S Fischer, E Heuser, R Petraityte-Burneikiene, R G Ulrich, J Jacob
Puumala virus (PUUV) causes many human infections in large parts of Europe and can lead to mild to moderate disease. The bank vole (Myodes glareolus) is the only reservoir of PUUV in Central Europe. A commercial PUUV rapid field test for rodents was validated for bank-vole blood samples collected in two PUUV-endemic regions in Germany (North Rhine-Westphalia and Baden-Württemberg). A comparison of the results of the rapid field test and standard ELISAs indicated a test efficacy of 93-95%, largely independent of the origin of the antigens used in the ELISA...
November 3, 2016: Epidemiology and Infection
https://www.readbyqxmd.com/read/27782121/de-novo-transcriptome-assembly-facilitates-characterisation-of-fast-evolving-gene-families-mhc-class-i-in-the-bank-vole-myodes-glareolus
#14
M Migalska, A Sebastian, M Konczal, P Kotlík, J Radwan
The major histocompatibility complex (MHC) plays a central role in the adaptive immune response and is the most polymorphic gene family in vertebrates. Although high-throughput sequencing has increasingly been used for genotyping families of co-amplifying MHC genes, its potential to facilitate early steps in the characterisation of MHC variation in nonmodel organism has not been fully explored. In this study we evaluated the usefulness of de novo transcriptome assembly in characterisation of MHC sequence diversity...
October 26, 2016: Heredity
https://www.readbyqxmd.com/read/27694145/a-borrelia-afzelii-infection-increases-larval-tick-burden-on-myodes-glareolus-rodentia-cricetidae-and-nymphal-body-weight-of-ixodes-ricinus-acari-ixodidae
#15
Gilian van Duijvendijk, Wouter van Andel, Manoj Fonville, Gerrit Gort, Joppe W Hovius, Hein Sprong, Willem Takken
Several microorganisms have been shown to manipulate their host or vector to enhance their own transmission. Here we examined whether an infection with Borrelia afzelii affects its transmission between its bank vole (Myodes glareolus, Schreber, 1780) host and tick vector. Captive-bred bank voles were inoculated with B. afzelii or control medium, after which host preference of Ixodes ricinus L. nymphs was determined in a Y-tube olfactometer. Thereafter, infected and uninfected bank voles were placed in a semifield arena containing questing larvae to measure larval tick attachment...
September 30, 2016: Journal of Medical Entomology
https://www.readbyqxmd.com/read/27687699/the-effect-of-aluminum-exposure-on-reproductive-ability-in-the-bank-vole-myodes-glareolus
#16
Agata Miska-Schramm, Joanna Kapusta, Małgorzata Kruczek
Human impact on the environment is steadily increasing the amounts of aluminum in the ecosystems. This element accumulates in plants and water, potentially exposing herbivores to its harmful effect. In heavily polluted sites, a decrease in the density of small rodent populations has been observed. This decline may be caused by many factors, including decreased fertility. The aim of the presented research was to determine how aluminum, administered at concentrations similar to those recorded in industrial districts (Al I = 3 mg/l, Al II = 200 mg/l), affects the reproductive abilities of small rodents...
September 29, 2016: Biological Trace Element Research
https://www.readbyqxmd.com/read/27632790/modification-of-nickel-accumulation-in-the-tissues-of-the-bank-vole-myodes-glareolus-by-chemical-and-environmental-factors
#17
Renata Świergosz-Kowalewska, Anita Tokarz
: In a full factorial laboratory experiment, the effects of temperature and two chemical stressors (nickel and chlorpyrifos) on the accumulation of nickel in the liver and kidney of bank voles were studied. The nine-week experiment consisted of three periods: acclimatisation (3 days), intoxication (6 weeks) and elimination (3 weeks). During the main intoxication phase the animals were orally exposed for 42 days to different doses of nickel (Ni) (0, 300 and 800mg/kg food) or chlorpyrifos (CPF) (0, 50 and 350mg/kg food) or a mixture of both chemicals...
September 12, 2016: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/27576687/n-terminal-prion-protein-peptides-prp-120-144-form-parallel-in-register-%C3%AE-sheets-via-multiple-nucleation-dependent-pathways
#18
Yiming Wang, Qing Shao, Carol K Hall
The prion diseases are a family of fatal neurodegenerative diseases associated with the misfolding and accumulation of normal prion protein (PrP(C)) into its pathogenic scrapie form (PrP(Sc)). Understanding the fundamentals of prion protein aggregation and the molecular architecture of PrP(Sc) is key to unraveling the pathology of prion diseases. Our work investigates the early-stage aggregation of three prion protein peptides, corresponding to residues 120-144 of human (Hu), bank vole (BV), and Syrian hamster (SHa) prion protein, from disordered monomers to β-sheet-rich fibrillar structures...
October 14, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27499001/declining-ecosystem-health-and-the-dilution-effect
#19
Hussein Khalil, Frauke Ecke, Magnus Evander, Magnus Magnusson, Birger Hörnfeldt
The "dilution effect" implies that where species vary in susceptibility to infection by a pathogen, higher diversity often leads to lower infection prevalence in hosts. For directly transmitted pathogens, non-host species may "dilute" infection directly (1) and indirectly (2). Competitors and predators may (1) alter host behavior to reduce pathogen transmission or (2) reduce host density. In a well-studied system, we tested the dilution of the zoonotic Puumala hantavirus (PUUV) in bank voles (Myodes glareolus) by two competitors and a predator...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27498685/multiple-independent-transmission-cycles-of-a-tick-borne-pathogen-within-a-local-host-community
#20
Maude Jacquot, David Abrial, Patrick Gasqui, Severine Bord, Maud Marsot, Sébastien Masseglia, Angélique Pion, Valérie Poux, Laurence Zilliox, Jean-Louis Chapuis, Gwenaël Vourc'h, Xavier Bailly
Many pathogens are maintained by multiple host species and involve multiple strains with potentially different phenotypic characteristics. Disentangling transmission patterns in such systems is often challenging, yet investigating how different host species contribute to transmission is crucial to properly assess and manage disease risk. We aim to reveal transmission cycles of bacteria within the Borrelia burgdorferi species complex, which include Lyme disease agents. We characterized Borrelia genotypes found in 488 infected Ixodes ricinus nymphs collected in the Sénart Forest located near Paris (France)...
2016: Scientific Reports
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