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https://www.readbyqxmd.com/read/28615038/prevalence-and-genetic-variability-of-anaplasma-phagocytophilum-in-wild-rodents-from-the-italian-alps
#1
Fausta Rosso, Valentina Tagliapietra, Ivana Baráková, Marketa Derdáková, Adam Konečný, Heidi Christine Hauffe, Annapaola Rizzoli
BACKGROUND: Human granulocytic anaplasmosis is a zoonotic bacterial disease with increasing relevance for public health in Europe. The understanding of its sylvatic cycle and identification of competent reservoir hosts are essential for improving disease risk models and planning preventative measures. RESULTS: In 2012 we collected single ear biopsy punches from 964 live-trapped rodents in the Province of Trento, Italy. Genetic screening for Anaplasma phagocytophilum (AP) was carried out by PCR amplification of a fragment of the 16S rRNA gene...
June 14, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28593480/difference-in-susceptibility-of-small-rodent-host-species-to-infestation-by-ixodes-ricinus-larvae
#2
László Egyed
In a laboratory experiment (repeated eight times) individuals of six small rodent species were mixed with 500 Ixodes ricinus larvae for 24 h, than over a 3-day-long observation period engorged ticks fallen from individually kept rodents were counted. Forty engorged larvae fell from the hosts, 25% from striped field mice, 32.5% from house mice, 22.5% from common voles, 10% from bank voles, while wood mouse and steppe mouse proved to be almost free of successfully infesting ticks (both 5%). Statistical analysis indicated, that tick burden differed significantly among host species...
June 7, 2017: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/28585306/circulation-and-diagnostics-of-puumala-virus-in-norway-nephropatia-epidemica-incidence-and-rodent-population-dynamics
#3
Natacha Milhano, Lars Korslund, Magnus Evander, Clas Ahlm, Kirsti Vainio, Susanne G Dudman, Åshild Andreassen
Hantaviruses pose a public health concern worldwide causing haemorrhagic fever with renal syndrome (HFRS) and hantavirus pulmonary syndrome (HPS). Puumala virus (PUUV) is the most prevalent hantavirus in Central and Northern Europe, and causes a mild form of HFRS, also known as nephropathia epidemica (NE). In nature, the main host of PUUV is the bank vole (Myodes glareolus), and transmission to humans occurs through inhalation of aerosols from rodent excreta. Nephropathia epidemica is particularly prevalent in Nordic countries, however, few studies of PUUV have been performed in Norway...
June 6, 2017: APMIS: Acta Pathologica, Microbiologica, et Immunologica Scandinavica
https://www.readbyqxmd.com/read/28567209/modelling-human-puumala-hantavirus-infection-in-relation-to-bank-vole-abundance-and-masting-intensity-in-the-netherlands
#4
Arno Swart, Dick L Bekker, Miriam Maas, Ankje de Vries, Roan Pijnacker, Chantal B E M Reusken, Joke W B van der Giessen
This paper deals with modelling the relationship between human Puumala hantavirus (PUUV) infection, the abundance and prevalence of infection of the host (the bank vole), mast, and temperature. These data were used to build and parametrise generalised regression models, and parametrise them using datasets on these factors pertaining to the Netherlands. The performance of the models was assessed by considering their predictive power. Models including mast and monthly temperature performed well, and showed that mast intensity influences vole abundance and hence human exposure for the following year...
2017: Infection Ecology & Epidemiology
https://www.readbyqxmd.com/read/28504447/tick-infestation-of-small-mammals-in-an-english-woodland
#5
Benjamin Cull, Alexander G C Vaux, Lisa J Ottowell, Emma L Gillingham, Jolyon M Medlock
Tick infestations on small mammals were studied from April to November, 2010, in deciduous woodland in southern England in order to determine whether co-infestations with tick stages occurred on small mammals, a key requirement for endemic transmission of tick-borne encephalitis virus (TBEV). A total of 217 small mammals was trapped over 1,760 trap nights. Yellow-necked mice (Apodemus flavicollis) made up the majority (52.5%) of animals, followed by wood mice (A. sylvaticus) 35.5% and bank voles (Myodes glareolus) 12%...
June 2017: Journal of Vector Ecology: Journal of the Society for Vector Ecology
https://www.readbyqxmd.com/read/28396283/experimental-infections-of-wild-bank-voles-myodes-glareolus-from-nephropatia-epidemica-endemic-and-non-endemic-regions-revealed-slight-differences-in-puumala-virological-course-and-immunological-responses
#6
Adélaïde Dubois, Guillaume Castel, Séverine Murri, Coralie Pulido, Jean-Baptiste Pons, Laure Benoit, Anne Loiseau, Latifa Lakhdar, Maxime Galan, Nathalie Charbonnel, Philippe Marianneau
In Europe, the occurrence of nephropathia epidemica (NE), a human disease caused by Puumala virus (PUUV), exhibits considerable geographical heterogeneity despite the continuous distribution of its reservoir, the bank vole Myodes glareolus. To better understand the causes of this heterogeneity, wild voles sampled in two adjacent NE endemic and non-endemic regions of France were infected experimentally with PUUV. The responses of bank voles to PUUV infection, based on the levels of anti-PUUV IgG and viral RNA, were compared...
April 8, 2017: Virus Research
https://www.readbyqxmd.com/read/28392045/low-prevalence-of-zoonotic-babesia-in-small-mammals-and-ixodes-ricinus-in-brittany-france
#7
M Jouglin, G Perez, A Butet, L Malandrin, S Bastian
In order to evaluate the zoonotic risk due to Babesia spp., especially B. microti, we investigated their presence in 597 individuals of five small mammal species and in 2620 questing nymphs of Ixodes ricinus in rural landscapes of Western France (Brittany). Small mammals (rodents and shrews) are indeed suspected to be reservoir hosts for B. microti, and the tick I. ricinus is the vector of the three main zoonotic species in Europe, i.e. B. divergens, B. venatorum and B. microti. Only one bank vole carried B...
March 25, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28359294/temporal-dynamics-of-the-tick-ixodes-ricinus-in-northern-europe-epidemiological-implications
#8
Claire Cayol, Esa Koskela, Tapio Mappes, Anja Siukkola, Eva R Kallio
BACKGROUND: Tick-borne pathogens pose an increasing threat to human and veterinary health across the northern hemisphere. While the seasonal activity of ticks is largely determined by climatic conditions, host-population dynamics are also likely to affect tick abundance. Consequently, abundance fluctuations of rodents in northern Europe are expected to be translated into tick dynamics, and can hence potentially affect the circulation of tick-borne pathogens. We quantified and explained the temporal dynamics of the tick Ixodes ricinus in the northernmost part of its European geographical range, by estimating (i) abundance in vegetation and (ii) infestation load in the most common rodent species in the study area, the bank vole Myodes glareolus...
March 31, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28332927/leptospira-spp-in-small-mammals-from-areas-with-low-and-high-human-hantavirus-incidences-in-south-west-germany
#9
Anna Obiegala, Christoph Albrecht, Maysaa Dafalla, Stephan Drewes, Carolin Oltersdorf, Hendrik Turni, Christian Imholt, Jens Jacob, Christiane Wagner-Wiening, Rainer G Ulrich, Martin Pfeffer
INTRODUCTION: Leptospirosis is caused by Leptospira spp. and is considered the most widespread zoonotic disease worldwide. It mimics nephropathia epidemica in humans, a disease mainly caused by Puumala hantavirus (PUUV). Small mammals are reservoirs for Leptospira spp. and PUUV. Seewis virus (SWSV) is a shrew-borne hantavirus with unknown pathogenicity. The objective of this study was to estimate the prevalence for Leptospira spp. and the frequency of Leptospira-hantavirus co-infections in small mammals collected at locations with high and low incidences in humans...
May 2017: Vector Borne and Zoonotic Diseases
https://www.readbyqxmd.com/read/28331581/strong-bottom-up-influences-on-small-mammal-populations-state-space-model-analyses-from-long-term-studies
#10
John R Flowerdew, Tatsuya Amano, William J Sutherland
"Bottom-up" influences, that is, masting, plus population density and climate, commonly influence woodland rodent demography. However, "top-down" influences (predation) also intervene. Here, we assess the impacts of masting, climate, and density on rodent populations placed in the context of what is known about "top-down" influences. To explain between-year variations in bank vole Myodes glareolus and wood mouse Apodemus sylvaticus population demography, we applied a state-space model to 33 years of catch-mark-release live-trapping, winter temperature, and precise mast-collection data...
March 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28298604/prion-strain-characterization-of-a-novel-subtype-of-creutzfeldt-jakob-disease
#11
Roberta Galeno, Michele Angelo Di Bari, Romolo Nonno, Franco Cardone, Marco Sbriccoli, Silvia Graziano, Loredana Ingrosso, Michele Fiorini, Angelina Valanzano, Giulia Pasini, Anna Poleggi, Ramona Vinci, Anna Ladogana, Maria Puopolo, Salvatore Monaco, Umberto Agrimi, Gianluigi Zanusso, Maurizio Pocchiari
In 2007, we reported a patient with an atypical form of Creutzfeldt-Jakob disease (CJD) heterozygous for methionine-valine (MV) at codon 129 who showed a novel pathological prion protein (PrP(TSE)) conformation with an atypical glycoform (AG) profile and intraneuronal PrP deposition. In the present study, we further characterize the conformational properties of this pathological prion protein (PrP(TSE) MV(AG)), showing that PrP(TSE) MV(AG) is composed of multiple conformers with biochemical properties distinct from those of PrP(TSE) type 1 and type 2 of MV sporadic CJD (sCJD)...
June 1, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28249631/expansion-of-spatial-and-host-range-of-puumala-virus-in-sweden-an-increasing-threat-for-humans
#12
O Borg, M Wille, P Kjellander, U A Bergvall, P-E Lindgren, J Chirico, Å Lundkvist
Hantaviruses are globally distributed and cause severe human disease. Puumala hantavirus (PUUV) is the most common species in Northern Europe, and the only hantavirus confirmed to circulate in Sweden, restricted to the northern regions of the country. In this study, we aimed to further add to the natural ecology of PUUV in Sweden by investigating prevalence, and spatial and host species infection patterns. Specifically, we wanted to ascertain whether PUUV was present in the natural reservoir, the bank vole (Myodes glareolus) further south than Dalälven river, in south-central Sweden, and whether PUUV can be detected in other rodent species in addition to the natural reservoir...
June 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28245831/puumala-hantavirus-infections-in-bank-vole-populations-host-and-virus-dynamics-in-central-europe
#13
Daniela Reil, Ulrike M Rosenfeld, Christian Imholt, Sabrina Schmidt, Rainer G Ulrich, Jana A Eccard, Jens Jacob
BACKGROUND: In Europe, bank voles (Myodes glareolus) are widely distributed and can transmit Puumala virus (PUUV) to humans, which causes a mild to moderate form of haemorrhagic fever with renal syndrome, called nephropathia epidemica. Uncovering the link between host and virus dynamics can help to prevent human PUUV infections in the future. Bank voles were live trapped three times a year in 2010-2013 in three woodland plots in each of four regions in Germany. Bank vole population density was estimated and blood samples collected to detect PUUV specific antibodies...
February 28, 2017: BMC Ecology
https://www.readbyqxmd.com/read/28225797/use-of-bovine-recombinant-prion-protein-and-real-time-quaking-induced-conversion-to-detect-cattle-transmissible-mink-encephalopathy-prions-and-discriminate-classical-and-atypical-l-and-h-type-bovine-spongiform-encephalopathy
#14
Soyoun Hwang, Justin J Greenlee, Eric M Nicholson
Prions are amyloid-forming proteins that cause transmissible spongiform encephalopathies through a process involving conversion from the normal cellular prion protein to the pathogenic misfolded conformation (PrPSc). This conversion has been used for in vitro assays including serial protein misfolding amplification and real-time quaking induced conversion (RT-QuIC). RT-QuIC can be used for the detection of prions in a variety of biological tissues from humans and animals. Extensive work has been done to demonstrate that RT-QuIC is a rapid, specific, and highly sensitive prion detection assay...
2017: PloS One
https://www.readbyqxmd.com/read/28192046/distribution-and-seasonal-variation-of-ljungan-virus-in-bank-voles-myodes-glareolus-in-fennoscandia
#15
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
#16
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...
May 2017: Archives of Virology
https://www.readbyqxmd.com/read/28070280/surviving-winter-food-but-not-habitat-structure-prevents-crashes-in-cyclic-vole-populations
#17
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
#18
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
#19
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...
June 2017: 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
#20
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
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