Matthias Eydal

Matthias Eydal
University of Iceland | HI · Institute for Experimental Pathology at Keldur

About

65
Publications
20,143
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474
Citations
Introduction
Matthias Eydal currently works at the Institute for Experimental Pathology, University of Iceland. Matthias does research in Parasitology.
Additional affiliations
January 1979 - May 2016
University of Iceland
Position
  • Part-time teacher
Description
  • Teaching in a parasitology course and in invertebrate zoology courses.
September 1977 - present
University of Iceland
Position
  • Associate research professor

Publications

Publications (65)
Article
Full-text available
The equine roundworm Parascaris univalens has developed resistance to the three anthelmintic substances most commonly used in horses. The mechanisms responsible for resistance are believed to be multi-genic, and transport proteins such as the P-glycoprotein (Pgp) family have been suggested to be involved in resistance in several parasites including...
Article
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Horses in Iceland have been isolated for more than 1,000 yr but still harbor a similar range of gastrointestinal parasites as do horses across the world. The long isolation of the horses and their parasites presumably means that no resistance genes have been introduced into the Parascaris spp. population. It is therefore of particular interest to i...
Article
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Background: Parascaris univalens is a pathogenic parasite of foals and yearlings worldwide. In recent years, Parascaris spp. worms have developed resistance to several of the commonly used anthelmintics, though currently the mechanisms behind this development are unknown. The aim of this study was to investigate the transcriptional responses in ad...
Article
In Iceland, there is at least 1 horse for every 5 human inhabitants, mostly kept on uncultivated rangelands. Although the Icelandic horse is considered robust compared with other breeds, it is nevertheless susceptible to disease. Few studies have investigated the prevalence of intestinal parasites in horses in Iceland. The purpose of this study was...
Article
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Importing dogs into Iceland was prohibited or restricted from 1909 until 1989, when the ban was lifted and importing dogs and cats permitted, with the proviso of an enforced period of quarantine and the requirement of specific medical treatments and examinations. Prior to importation pets must be treated against cestodes and external parasites. Fro...
Article
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Background Ixodes ricinus is a three-host tick, a principal vector of Borrelia burgdorferi (s.l.) and one of the main vectors of tick-borne encephalitis (TBE) virus. Iceland is located in the North Atlantic Ocean with subpolar oceanic climate. During the past 3–4 decades, average temperature has increased, supporting more favourable conditions for...
Article
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Microsporidia are fungal parasites that infect diverse invertebrate and vertebrate hosts. Finfish aquaculture supports epizootics due to high host density and the high biotic potential of these parasites. Reliable methods for parasite detection and identification are a necessary precursor to empirical assessment of strategies to mitigate effects of...
Article
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The Microsporidia are a major group of intracellular fungi and important parasites of animals including insects, fish, and immunocompromised humans. Microsporidian genomes have undergone extreme reductive evolution but there are major differences in genome size and structure within the group: some are prokaryote-like in size and organisation (<3 Mb...
Article
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The aim of this paper is to report cases of the intestinal parasitic nematode Strongyloides stercoralis in dogs in Iceland. The nematode was diagnosed in 20 (0.6%) of imported dogs in quaratine in Iceland during 1989- 2016. Household dogs: The first case of S. stercoralis infection diagnosed outside quaratine in Iceland was in an unhealthy househol...
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Rannsóknir og þróun eru undirstaða allra atvinnugreina. Atvinnugrein sem heldur ekki í við framfarir og þróun þrífst ekki eða dafnar til lengdar. Á Tilraunastöð Háskóla Íslands í meinafraeði að Keldum eru stundaðar rannsóknir sem tengjast dýraheilbrigði og sjúkdómum í dýrum og mönnum. Þar er veitt ráðgjöf og þjónusta í þágu heilbrigðiseftirlits, sj...
Article
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Eight species of ticks of the family Ixodidae have been identified in Iceland; Ixodes uriae, I. caledonicus, I. ricinus, I. hexagonus, I. cf scapularis, Rhipicephalus sanguineus, Dermacentor variabilis and Hyalomma aegyptium. Ticks of the family Argasidae have not been found. I. uriae is indigenous and common in seabird colonies in Iceland. I. cale...
Article
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The large roundworm of horses, Parascaris equorum is considered ubiquitous in breeding operations, and is regarded as a most important helminth pathogen of foals. Over the past decade, this parasite has been reported increasingly resistant to anthelmintic drugs worldwide. This paper reports analysis of the population genetic structure of P. equorum...
Article
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This paper reports the adult stage of Prosorhynchoides borealis (Digenea) from Lophius piscatorius in Icelandic waters and infections with the larval stages (sporocysts and cercariae) found for the first time in the bivalve Abra prismatica (Semelidae). The previously known first intermediate host was Abra alba (Semelidae). Ribosomal DNA sequencing...
Article
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Examination of three scallop species from three separate locations: Iceland scallop from Icelandic waters, king scallop from Scottish waters and queen scallop from Faroese and Scottish waters, revealed infections of a previously unknown apicomplexan parasite in all three scallop species. Developmental forms observed in the shells appeared to includ...
Article
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Wild Iceland scallops Chlamys islandica from an Icelandic bay were examined for parasites. Queen scallops Aequipecten opercularis from the Faroe Islands and king scallops Pecten maximus and queen scallops from Scottish waters were also examined. Observations revealed heavy infections of eimeriorine parasites in 95-100% of C. islandica but not the o...
Article
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Previous studies have shown considerable variability in morphological features and the existence of genetically distinct sibling species in the acanthocephalan Echinorhynchus gadi Zoega in Müller, 1776. The aim of the present study was to follow up and extend those earlier studies by using a combination of DNA analysis and morphometrics to investig...
Data
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Supplementary data. Additional small subunit ribosomal DNA sequences used in the phylogenetic analyses.
Article
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Epidermal pseudotumours from Hippoglossoides dubius and Acanthogobius flavimanus in Japan and gill lesions in Limanda limanda from the UK have been shown to be caused by phylogenetically related protozoan parasites, known collectively as X-cells. However, the phylogenetic position of the X-cell group is not well supported within any of the existing...
Article
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This study investigated the prevalence of pseudobranchial X-cell pseudotumors in 2 year classes of wild juvenile cod and to a lesser extent in older cod in NW Iceland. The disease was also monitored in farmed wild-caught juvenile cod. The youngest wild cod detected that had X-cell infections were 6.5 to 13.0 cm in length, with prevalence reaching a...
Article
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The aim of the present study was to survey lice and mite species infesting cattle in Iceland and to evaluate their prevalence on farms, prevalence and site preferences on the animals and correlation with dermatological symptoms. The survey included two separate investigations, a combing study including 50 calves and 50 dairy cows, and a study of sk...
Article
Insect bite hypersensitivity (IBH) is an IgE-mediated dermatitis of horses caused by bites of Culicoides spp. IBH does not occur in Iceland where Culicoides are absent. However, following importation into continental Europe where Culicoides are present, >or=50% of Icelandic horses (1st generation) develop IBH but <or=10% of their offspring born in...
Book
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In the autumn of the year 1948 the Institute for Experimental Pathology, University of Iceland, Keldur, was established and is therefore celebrating its sixty years anniversary. From the early days of the institute it has been acting as a university institution focusing on academic veterinary and biomedical research. The major activities have been...
Article
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Two year classes of wild cod juveniles, caught for on-rearing in shore-based tanks, were examined for Trichodina spp. infections at regular intervals for 9 mo. The prevalence, density and proportion of each species found was determined. Additionally, biomass, seawater temperature and salinity in the tanks was recorded regularly. Two species were id...
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Lice infestations on horses caused by the lice Werneckiella (Damalinia) equi and Haematopinus equi are observed worldwide. In this study, the distribution and clinical manifestations of lice on Icelandic horses were examined. Thirty-eight out of 93 animals (40.86%) were identified as infested with W. equi. Sixty-eight animals (73.12%) presented der...
Article
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Lice infestations in horses caused by the chewing louse Werneckiella (Damalinia) equi are observed worldwide. In the present study, the efficacy of 10% imidacloprid was tested on horses naturally infested with lice. Two groups of animals received a double application of 4 ml and 8 ml Advantage 10% spot-on on day 0 and 28 either. Horses, presenting...
Article
Full-text available
Infestation with the chewing louse (Werneckiella (Damalinia) equi) can be found on horses world-wide. Louse infestations, including clinical signs of louse-derived dermatitis, are known from Icelandic horses. A clinical field investigation was conducted in Iceland using horses with natural louse infestations to evaluate the efficacy of imidacloprid...
Conference Paper
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Various studies have been performed on endoparasites of the Icelandic horse in Iceland during the last 2-3 decades. These include identification of the helminth species occurring in the gastrointestinal tract, studies on the seasonal fluctuation in fecal worm egg output, the effect of anthelmintic treatments, and a study on pasture larval contamina...
Conference Paper
Full-text available
In the present study the efficacy of imidacloprid in a 10% solution (Advantage® spot-on) and a 0.05% solution of phoxim (Sebacil® Vet, 10 ml 50% concentrate in 10 l water) was evaluated for control of equine lice on naturally infested horses in Iceland. One group of 27 horses in 3 stables received an imidacloprid treatment (day 0: two times 4 ml Ad...
Article
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ÁGRIP Í þessu riti er gerð grein fyrir sjúkdómum sem gaetir á mismunandi þroskastigum þorsksins, allt frá frumfóðrun þorsklirfa til seiðaeldis í strandkerum og síðan áframeldis á sláturfiski í sjókvíum. Einnig er fjallað um helstu eiginleika ónaemiskerfis fiska, með áherslu á þorsk, og í hverju það er frábrugðið því sem gerist meðal dýra með heitt...
Article
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YFIRLIT Fjórar tegundir sérhaefðra ytri sníkjudýra sauðfjár hafa fundist á Íslandi. Þaer eru fjárkláðamaurinn Psoroptes ovis, fótakláðamaurinn Chorioptes ovis, fellilúsin Bovicola (Damalinia) ovis og faerilúsin Melophagus ovinus. Gefið er ágrip af því sem vitað er um sögu tegundanna á Íslandi en allar hafa þaer sennilega verið útbreiddar og algenga...
Article
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Forty-four of 50 arctic foxes (Alopex lagopus) in Iceland harbored 15 species of intestinal parasites, including Protozoa: Eimeria sp. or Isospora sp. (in 4%); Trematoda: Cryptocotyle lingua (24%), Plagiorchis elegans (4%), Brachylaemus sp. (12%), Tristriata sp. (10%), and Spelotrema sp. (8%); Cestoda: Mesocestoides canislagopodis (72%), Schistocep...
Article
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Neðst á síðunni er hægt að nálgast greinina í heild sinni með því að smella á hlekkinn Skoða/Opna(view/open) A survey of endoparasites found in humans in Iceland. At least 29 species of endoparasites capable of infecting humans have been found in Iceland (see Table). Only 8 species are definitely endemic, four are questionable and the remaining spe...
Article
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Neðst á síðunni er hægt að nálgast greinina í heild sinni með því að smella á hlekkinn Skoða/Opna(view/open) Infections caused by the coccidian Cryptosporidium in humans in Iceland. At the Institute for Experimental Pathology, University of Iceland, Keldur, Reykjavik, routine parasitological examinations of stool samples from humans are performed....
Article
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Neðst á síðunni er hægt að nálgast greinina í heild sinni með því að smella á hlekkinn Skoða/Opna(view/open) During 1973-1988 altogether 3922 samples from 2528 individuals suspected of carrying endoparasites were examined at the Institute for Experimental Pathology at Keldur, University of Iceland (Figures 1 and 2). Approximately 99% of the samples...
Article
Full-text available
The objective of this study was to determine the presence and nature of helminth infections in horses in Iceland with very little exposure to anthelmintics. Faecal samples were collected from 57 horses, five months to 20 years old, in October 1991. The animals belonged to a group of unbroken horses which had only been treated once with anthelmintic...

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Projects (2)
Project
Tilraunastöð Háskóla Íslands í meinafræði að Keldum er leiðandi stofnun í rannsóknum á sjúkdómum og sjúkdómavörnum dýra. Rannsakaðir eru sjúkdómar í flestum spendýrategundum Íslands og allmörgum fugla- og fisktegundum. Tilgangur rannsóknanna er að efla skilning á eðli sjúkdóma og skapa nýja þekkingu. Heilbrigð dýr eru forsenda arðvænlegs landbúnaðar og fiskeldis. Einnig er mikilvægi heilbrigðra dýra sem bera ekki sjúkdóma í menn hvati að hagnýtingu rannsóknanna. Mikilvægt er að stofnunin geti brugðist sem skjótast við nýjum og aðkallandi vandamálum á sviði sjúkdómagreininga. Framtíðarsýnin er skýr m.t.t. hvernig efla má fræðasviðin. Áherslan innan fræðasviða beinist að fjölbreyttu vísindastarfi og þjónustu og að hún haldist í hendur við atvinnulífið og þá vaxtarbrodda sem þar er að finna. Helstu fræðasviðin eru príonfræði, veirufræði, bakteríufræði, sníkjudýrafræði, meinafræði, ónæmisfræði, sameindalíffræði og tilraunadýrafræði. Núverandi staða dýrasjúkdóma með vaxandi skráningu og eftirliti, stærð og landfræðileg lega landsins gera það að verkum að á Íslandi eru kjöraðstæður fyrir ýmis rannsóknar- og skimunarverkefni. Ónæmiskerfi dýra á Íslandi hefur ekki verið útsett fyrir ýmsum smitefnum og mismunandi stofnum þeirra í sama mæli og víðast erlendis. Hérlendis finnast ekki mörg þeirra smitefna sem eru landlæg í nágrannalöndunum. Á Íslandi eru því dýrastofnar sem hafa annað næmi fyrir ýmsum sjúkdómum en gengur og gerist í heiminum. Einnig fyrirfinnst tegundafæð í íslenskri náttúru. Rannsóknir á slíkum efnivið hafa gefið Tilraunastöðinni sérstöðu. Vaxandi lífsýnasöfn gefa aukna möguleika á nýjum samanburðarrannsóknum af ýmsum toga. Víðtækt samstarf er við erlendar alþjóðlegar stofnanir og háskóla. Innanlands eru ákveðin verkefni unnin í samstarfi við stofnanir og háskóla og aðstaða og tæki eru samnýtt. Tilraunastöðin er í samstarfi við innlenda og erlenda aðila vegna notkunar og uppbyggingar á kjarnaaðstöðu vegna rannsóka. Einnig er samstarf við stjórnsýslu- og eftirlitsstofnanir innanlands, s.s. MAST. Samhliða þessu er fjölbreytt og gefandi samstarf við atvinnulífið, má þar nefna landbúnað, fiskeldi, matvælaframleiðslu og líftækniiðnað. Tilraunastöðin hefur þjónustuskyldur varðandi greiningar á dýrasjúkdómum, en þær eru unnar í nánum tengslum við rannsóknirnar til að samlegðaráhrif verði sem best. Starfið á Keldum er gott dæmi um hvernig tengsl atvinnulífs og vísindastarfs geta verið. Þetta er einkar mikilvægt í okkar litla landi þar sem rannsóknarvinnan sem fram fer á Keldum nýtist þörfum atvinnulífs til vísindarannsókna og sú vinna skilar áfram nýrri þekkingu og greiningaraðferðum út í atvinnulífið. Vegna aukinna krafa í gæðamálum vegna útflutnings hefur skimun á smitefnum, sem ekki hafa greinst í landinu, aukist á síðustu árum. Tilraunastöðin starfar sem innlend tilvísunarrannsóknastofa á nokkrum sviðum. Á stofnuninni er unnið eftir gæðakerfi og er Tilraunastöðin með faggildingu á völdum prófunaraðferðum samkvæmt alþjóðlegum faggildingarstaðli. Áfram er unnið að faggildingu helstu greiningaraðferða Tilraunastöðvarinnar.