Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Effect of rodent density on tick and tick-borne pathogen populations: Consequences for infectious disease risk
    Krawczyk, Aleksandra I. ; Duijvendijk, Gilian L.A. Van; Swart, Arno ; Heylen, Dieter ; Jaarsma, Ryanne I. ; Jacobs, Frans H.H. ; Fonville, Manoj ; Sprong, Hein ; Takken, Willem - \ 2020
    Parasites & Vectors 13 (2020)1. - ISSN 1756-3305
    Disease risk - Ixodes ricinus - Rodent density - Tick-borne pathogens - Transmission dynamics

    Background: Rodents are considered to contribute strongly to the risk of tick-borne diseases by feeding Ixodes ricinus larvae and by acting as amplifying hosts for pathogens. Here, we tested to what extent these two processes depend on rodent density, and for which pathogen species rodents synergistically contribute to the local disease risk, i.e. the density of infected nymphs (DIN). Methods: In a natural woodland, we manipulated rodent densities in plots of 2500 m2 by either supplementing a critical food source (acorns) or by removing rodents during two years. Untreated plots were used as controls. Collected nymphs and rodent ear biopsies were tested for the presence of seven tick-borne microorganisms. Linear models were used to capture associations between rodents, nymphs, and pathogens. Results: Investigation of data from all plots, irrespective of the treatment, revealed a strong positive association between rodent density and nymphal density, nymphal infection prevalence (NIP) with Borrelia afzelii and Neoehrlichia mikurensis, and hence DIN's of these pathogens in the following year. The NIP, but not the DIN, of the bird-associated Borrelia garinii, decreased with increasing rodent density. The NIPs of Borrelia miyamotoi and Rickettsia helvetica were independent of rodent density, and increasing rodent density moderately increased the DINs. In addition, NIPs of Babesia microti and Spiroplasma ixodetis decreased with increasing rodent density, which had a non-linear association with DINs of these microorganisms. Conclusions: A positive density dependence for all rodent- A nd tick-associated tick-borne pathogens was found, despite the observation that some of them decreased in prevalence. The effects on the DINs were variable among microorganisms, more than likely due to contrasts in their biology (including transmission modes, host specificity and transmission efficiency). The strongest associations were found in rodent-associated pathogens that most heavily rely on horizontal transmission. Our results draw attention to the importance of considering transmission mode of a pathogen while developing preventative measures to successfully reduce the burden of disease.

    Anaplasma phagocytophilum evolves in geographical and biotic niches of vertebrates and ticks
    Jaarsma, Ryanne I. ; Sprong, Hein ; Takumi, Katsuhisa ; Kazimirova, Maria ; Silaghi, Cornelia ; Mysterud, Atle ; Rudolf, Ivo ; Beck, Relja ; Földvári, Gábor ; Tomassone, Laura ; Groenevelt, Margit ; Everts, Reinard R. ; Rijks, Jolianne M. ; Ecke, Frauke ; Hörnfeldt, Birger ; Modrý, David ; Majerová, Karolina ; Votýpka, Jan ; Estrada-Peña, Agustín - \ 2019
    National Institute for Public Health and the Environment (RIVM)
    Anaplasma phagocytophilum - Ticks - Ixodidae - Molecular epidemiology - Transmission dynamics - Network analysis
    Background Anaplasma phagocytophilum is currently regarded as a single species. However, molecular studies indicate that it can be subdivided into ecotypes, each with distinct but overlapping transmission cycle. Here, we evaluate the interactions between and within clusters of haplotypes of the bacterium isolated from vertebrates and ticks, using phylogenetic and network-based methods. Methods The presence of A. phagocytophilum DNA was determined in ticks and vertebrate tissue samples. A fragment of the groEl gene was amplified and sequenced from qPCR-positive lysates. Additional groEl sequences from ticks and vertebrate reservoirs were obtained from GenBank and through literature searches, resulting in a dataset consisting of 1623 A. phagocytophilum field isolates. Phylogenetic analyses were used to infer clusters of haplotypes and to assess phylogenetic clustering of A. phagocytophilum in vertebrates or ticks. Network-based methods were used to resolve host-vector interactions and their relative importance in the segregating communities of haplotypes. Results Phylogenetic analyses resulted in 199 haplotypes within eight network-derived clusters, which were allocated to four ecotypes. The interactions of haplotypes between ticks, vertebrates and geographical origin, were visualized and quantified from networks. A high number of haplotypes were recorded in the tick Ixodes ricinus. Communities of A. phagocytophilum recorded from Korea, Japan, Far Eastern Russia, as well as those associated with rodents had no links with the larger set of isolates associated with I. ricinus, suggesting different evolutionary pressures. Rodents appeared to have a range of haplotypes associated with either Ixodes trianguliceps or Ixodes persulcatus and Ixodes pavlovskyi. Haplotypes found in rodents in Russia had low similarities with those recorded in rodents in other regions and shaped separate communities. Conclusions The groEl gene fragment of A. phagocytophilum provides information about spatial segregation and associations of haplotypes to particular vector-host interactions. Further research is needed to understand the circulation of this bacterium in the gap between Europe and Asia before the overview of the speciation features of this bacterium is complete. Environmental traits may also play a role in the evolution of A. phagocytophilum in ecotypes through yet unknown relationships.
    Anaplasma phagocytophilum evolves in geographical and biotic niches of vertebrates and ticks
    Jaarsma, Ryanne I. ; Sprong, Hein ; Takumi, Katsuhisa ; Kazimirova, Maria ; Silaghi, Cornelia ; Mysterud, Atle ; Rudolf, Ivo ; Beck, Relja ; Földvári, Gábor ; Tomassone, Laura ; Groenevelt, Margit ; Everts, Reinard R. ; Rijks, Jolianne M. ; Ecke, Frauke ; Hörnfeldt, Birger ; Modrý, David ; Majerová, Karolina ; Votýpka, Jan ; Estrada-Peña, Agustín - \ 2019
    Parasites & Vectors 12 (2019). - ISSN 1756-3305
    Anaplasma phagocytophilum - Ixodidae - Molecular epidemiology - Network analysis - Ticks - Transmission dynamics

    Background: Anaplasma phagocytophilum is currently regarded as a single species. However, molecular studies indicate that it can be subdivided into ecotypes, each with distinct but overlapping transmission cycle. Here, we evaluate the interactions between and within clusters of haplotypes of the bacterium isolated from vertebrates and ticks, using phylogenetic and network-based methods. Methods: The presence of A. phagocytophilum DNA was determined in ticks and vertebrate tissue samples. A fragment of the groEl gene was amplified and sequenced from qPCR-positive lysates. Additional groEl sequences from ticks and vertebrate reservoirs were obtained from GenBank and through literature searches, resulting in a dataset consisting of 1623 A. phagocytophilum field isolates. Phylogenetic analyses were used to infer clusters of haplotypes and to assess phylogenetic clustering of A. phagocytophilum in vertebrates or ticks. Network-based methods were used to resolve host-vector interactions and their relative importance in the segregating communities of haplotypes. Results: Phylogenetic analyses resulted in 199 haplotypes within eight network-derived clusters, which were allocated to four ecotypes. The interactions of haplotypes between ticks, vertebrates and geographical origin, were visualized and quantified from networks. A high number of haplotypes were recorded in the tick Ixodes ricinus. Communities of A. phagocytophilum recorded from Korea, Japan, Far Eastern Russia, as well as those associated with rodents had no links with the larger set of isolates associated with I. ricinus, suggesting different evolutionary pressures. Rodents appeared to have a range of haplotypes associated with either Ixodes trianguliceps or Ixodes persulcatus and Ixodes pavlovskyi. Haplotypes found in rodents in Russia had low similarities with those recorded in rodents in other regions and shaped separate communities. Conclusions: The groEl gene fragment of A. phagocytophilum provides information about spatial segregation and associations of haplotypes to particular vector-host interactions. Further research is needed to understand the circulation of this bacterium in the gap between Europe and Asia before the overview of the speciation features of this bacterium is complete. Environmental traits may also play a role in the evolution of A. phagocytophilum in ecotypes through yet unknown relationships.

    Referenties en maatlatten voor natuurlijke watertypen voor de Kaderrichtlijn Water 2021-2027
    Altenburg, W. ; Arts, G. ; Baretta-Bekker, J.G. ; Berg, M.S. van den; Broek Broek, T. van den; Buskens, R. ; Bijkerk, R. ; Coops, H.C. ; Dam, H. van; Ee, G. van; Evers, C.H.M. ; Franken, R. ; Higler, B. ; Ietswaart, T. ; Jaarsma, N. ; Jong, D.J. de; Joosten, A.M.T. ; Klinge, M. ; Knoben, R.A.E. ; Kranenbarg, J. ; Loon, W.M.G.M. van; Noordhuis, R. ; Pot, R. ; Twisk, F. ; Verdonschot, P.F.M. ; Vlek, H. ; Backx, J.J.G.M. ; Beers, M. ; Buijse, A.D. ; Duursema, G. ; Fagel, M. ; Leeuw, J. de; Molen, J. van der; Nijboer, R.C. ; Postma, J. ; Vriese, T. ; Duijts, R. ; Hartholt, J.G. ; Jager, Z. ; Stikvoort, E.C. ; Walvoort, D. - \ 2018
    Amersfoort : Stowa (Stowa rapport 2018-49) - ISBN 9789057738135 - 481
    Landbouwvoertuigen op de openbare weg : Aan welke voorschriften moeten ze voldoen en waar mogen ze (niet) rijden?
    Jaarsma, C.F. - \ 2018
    Verkeersrecht (2018)1. - ISSN 0042-398X - p. 2 - 11.
    Landbouwvoertuigen zijn ontwikkeld voor gebruik op het land. Ze missen daardoor veiligheidsvoorzieningen zoals zijafscherming bij vrachtauto’s en kreukelzones bij personenauto’s. Ze zijn groot en zwaar ten opzichte van andere motorvoertuigen, maar rijden langzamer. Maar ten opzichte van zwakke verkeersdeelnemers (fietsers, joggers, wandelaars) rijden ze juist snel… Op de openbare weg zijn er dan ook spanningsvelden met andere verkeersdeelnemers, die doorwerken in de verkeersveiligheid. Wegbeheerders worstelen daardoor met de vraag wat de beste plek is voor landbouwvoertuigen op hun wegennetwerk. Een belangrijke rol daarbij speelt de slepende discussie over de kentekening van landbouwvoertuigen in combinatie met een verhoging van de toegestane maximumsnelheid van de huidige 25 km/u naar 40 km/u. Alle reden dus om landbouwvoertuigen en de daarop betrekking hebbende bijzondere voorschriften voor het deelnemen met dergelijke voertuigen aan het verkeer op de openbare weg nader onder de loep te nemen.
    In Fryslân vaakst fatale tractorongelukken
    Jaarsma, C.F. - \ 2017
    Verschillende rollen politie voor ongevalspreventie bij landbouwvoertuigen, ook zonder kentekening : Landbouwongevallen en verkeersveiligheid: de rol van de politie
    Jaarsma, C.F. ; Hoofwijk, H. - \ 2017
    Verkeersknooppunt : vaktijdschrift voor verkeersprofessionals (2017)200. - ISSN 0920-3834 - p. 4 - 12.
    Graag een ‘herstelwet’ in het regeringsprogramma : Open brief aan kabinets(in)formateur
    Jaarsma, C.F. - \ 2017
    Verkeerskunde 68 (2017)2. - ISSN 0377-8495 - p. 18 - 19.
    Multifunctionele herstelwet voor gekoppelde ongevalspreventie, voertuigveiligheid, routering en snelheidsverhoging : Kentekening landbouwvoertuigen en verkeersveiligheid: een oproep aan de leden van de Tweede Kamer
    Jaarsma, C.F. ; Hoofwijk, H. - \ 2017
    Verkeersknooppunt : vaktijdschrift voor verkeersprofessionals 201 (2017). - ISSN 0920-3834 - p. 8 - 11.
    Environmental surveillance during an outbreak of tularaemia in hares, the Netherlands, 2015
    Janse, Ingmar ; Maas, M. ; Rijks, J.M. ; Koene, M. ; Plaats, R.Q. van der; Engelsma, M. ; Tas, P.W.L. ; Braks, M. ; Stroo, A. ; Notermans, D.W. ; Vries, M.C. de; Reubsaet, F.A.G. ; Fanoy, E. ; Swaan, C.M. ; Kik, M.J. ; Ijzer, J. ; Jaarsma, R.I. ; Wieren, S. van; Roda Husman, A.M. de; Passel, M. van; Roest, H. ; Giessen, J. van der - \ 2017
    Eurosurveillance 22 (2017)35. - ISSN 1025-496X
    Tularaemia, a disease caused by the bacterium Francisella tularensis, is a re-emerging zoonosis in the Netherlands. After sporadic human and hare cases occurred in the period 2011 to 2014, a cluster of F. tularensis-infected hares was recognised in a region in the north of the Netherlands from February to May 2015. No human cases were identified, including after active case finding. Presence of F. tularensis was investigated in potential reservoirs and transmission routes, including common voles, arthropod vectors and surface waters. F. tularensis was not detected in common voles, mosquito larvae or adults, tabanids or ticks. However, the bacterium was detected in water and sediment samples collected in a limited geographical area where infected hares had also been found. These results demonstrate that water monitoring could provide valuable information regarding F. tularensis spread and persistence, and should be used in addition to disease surveillance in wildlife.
    Referenties en maatlatten voor natuurlijke watertypen voor de kaderrichtlijn water 2015-2021 ; 2e dr.
    Altenburg, W. ; Arts, G. ; Baretta-Bekker, J.G. ; Berg, M.S. van den; Broek, T. van den; Buskens, R. ; Bijkerk, R. ; Coops, H.C. ; Dam, H. van; Ee, G. van; Evers, C.H.M. ; Franken, R. ; Higler, B. ; Ietswaart, T. ; Jaarsma, N. ; Jong, D.J. de; Joosten, A.M.T. ; Klinge, M. ; Knoben, R.A.E. ; Kranenbarg, J. ; Loon, W.M.G.M. van; Noordhuis, R. ; Pot, R. ; Twisk, F. ; Verdonschot, P.F.M. ; Vlek, H. ; Wolfstein, K. ; Backx, J.J.G.M. ; Beers, M. ; Buijse, A.D. ; Duursema, G. ; Fagel, M. ; Leeuw, J. de; Molen, J. van der; Nijboer, R.C. ; Postma, J. ; Vriese, T. ; Molen, D.T. van der; Herpen, F.C.J. van; Nieuwerburgh, L.L.J. van - \ 2016
    Amersfoort : Stowa (Stowa rapport 2012-31) - 466
    In het najaar van 2012 werd een geactualiseerde versie van het document Referenties en maatlatten voor natuurlijke watertypen voor de Kaderrichtlijn Water 2015-2021 vastgesteld. Uit het gebruik van deze maatlatten en het programmeren van de Aquokit Biologie (webservice voor toetsen van ecologische kwaliteit met deze maatlatten ontwikkeld door het InformatieHuis Water) bleek dat er correcties en verduidelijkingen nodig waren om te zorgen voor een juiste en consistente toepassing van de maatlatten. Deze correcties en verduidelijkingen zijn doorgevoerd in deze tweede druk. In bijlage 14 is een overzicht opgenomen van de aanpassingen in de maatlat ten opzichte van de eerst druk.
    Kolossen op de weg
    Jaarsma, Rinus - \ 2016
    Vaker fatale afloop bij Fries ongeval: bij één op de 10 ongelukken met landbouwvoertuigen is een dode te betreuren
    Jaarsma, Rinus - \ 2016
    De verschillende talen van verkeersborden: verboden en overstekende dieren
    Jaarsma, Rinus - \ 2016
    Verkeersveiligheid landbouwvoertuigen 1987-2015 : een analyse, met de nadruk op ontwikkelingen in de laatste zeven jaar
    Jaarsma, C.F. - \ 2016
    Wageningen : Wageningen University & research, Leerstoelgroep Landgebruiksplanning (Nota / Vakgroep Ruimtelijke Planvroming nummer 117) - ISBN 9789462579248 - 114
    Opinions of veterinarians on antimicrobial use in farm animals in Flanders and the Netherlands
    Postma, M. ; Speksnijder, D.C. ; Jaarsma, A.D.C. ; Verheij, T.J.M. ; Wagenaar, J.A. ; Dewulf, J. - \ 2016
    Veterinary Record 179 (2016)3. - ISSN 0042-4900

    Veterinarians play an important role in the reduction of antimicrobial use in farm animals. This study aims to quantify opinions of veterinarians from the Netherlands and Flanders regarding antimicrobial use and resistance issues in farm animals. An online survey was sent out to 678 and 1100 farm animal veterinarians in Flanders and the Netherlands, of which 174 and 437 were returned respectively. Suboptimal climate conditions were regarded as the most important cause for high antimicrobial use in farm animals. Flemish veterinarians also regarded insufficient biosecurity measures and farmers' mentality as important determinants, while the Dutch respondents ranked insufficient immunity of young animals and economic considerations of farmers as major causes. The majority of Dutch respondents (63.8 per cent) supported the existing national policy, which aimed to halve veterinary antimicrobial use, while the Flemish (32.9 per cent) were less supportive of such a policy. Improvements in housing and climate conditions, biosecurity measures and strict control of specific infectious diseases were seen as important and promising measures to reduce antimicrobial use. To reduce antimicrobial use in farm animals, some shared approaches might be applicable in both countries. However, cultural, political and societal differences between Flanders and the Netherlands require differentiated approaches to reduce veterinary antimicrobial use.

    Verborgen fietsleed : Ontwikkelingen in de verkeers(on)veiligheid van fietsende senioren
    Jaarsma, C.F. ; Neuvel, J.M.M. - \ 2016
    Verborgen fietsleed : Tijd voor een Deltaplan ‘Verkeersveilig Fietsen’?
    Jaarsma, C.F. ; Neuvel, J.M.M. - \ 2016
    Verkeerskunde (2016)2. - ISSN 0377-8495 - p. 14 - 15.
    Aanpassing van de KRW Visindex O2 aan boomkor-­ en fuikmonitoring
    Jager, Zwanette ; Jaarsma, N. ; Boois, I.J. de; Griffioen, A.B. - \ 2015
    ZiltWater Advies (Rapport ZW 2015-02) - 32 p.
    Aanpassing KRW Visindex IJsselmeer
    Jager, Zwanette ; Jaarsma, N. ; Boois, I.J. de; Griffioen, A.B. ; Breine, J. - \ 2015
    ZiltWater Advies (Rapport ZW 2015-01) - 20 p.
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