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.

    We have a manual that explains all the features 

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Letter to the editor: Financial complexity: Accounting for fraud—Response
Battiston, Stefano ; Farmer, D. ; Flache, Andreas ; Garlaschelli, Diego ; Haldane, Andy ; Heesterbeek, H. ; Hommes, C. ; Jaeger, C. ; May, R. ; Scheffer, M. - \ 2016
Science 352 (2016)6283. - ISSN 0036-8075 - p. 302 - 302.
Methicillin resistant Staphylococcus aureus ST398 in veal calf farming: human MRSA carriage related with animal antimicrobial usage and farm hygiene
Graveland, H. ; Wagenaar, J.A. ; Heesterbeek, H. ; Mevius, D.J. ; Duijkeren, E. van; Heederik, D.J.J. - \ 2010
PLoS ONE 5 (2010). - ISSN 1932-6203
food animals - health consequences - pet animals - transmission - hospitals - pigs - bacteria - strains - origin - agents
Introduction Recently a specific MRSA sequence type, ST398, emerged in food production animals and farmers. Risk factors for carrying MRSA ST398 in both animals and humans have not been fully evaluated. In this cross-sectional study, we investigated factors associated with MRSA colonization in veal calves and humans working and living on these farms. Methods A sample of 102 veal calf farms were randomly selected and visited from March 2007–February 2008. Participating farmers were asked to fill in a questionnaire (n = 390) to identify potential risk factors. A nasal swab was taken from each participant. Furthermore, nasal swabs were taken from calves (n = 2151). Swabs were analysed for MRSA by selective enrichment and suspected colonies were confirmed as MRSA by using slide coagulase test and PCR for presence of the mecA-gene. Spa types were identified and a random selection of each spa type was tested with ST398 specific PCR. The Sequence Type of non ST398 strains was determined. Data were analyzed using logistic regression analysis. Results Human MRSA carriage was strongly associated with intensity of animal contact and with the number of MRSA positive animals on the farm. Calves were more often carrier when treated with antibiotics, while farm hygiene was associated with a lower prevalence of MRSA. Conclusion This is the first study showing direct associations between animal and human carriage of ST398. The direct associations between animal and human MRSA carriage and the association between MRSA and antimicrobial use in calves implicate prudent use of antibiotics in farm animals.
How resource competition shapes individual life history for nonplastic growth: ungulates in seasonal food environments
Roos, A. de; Galic, N.G. ; Heesterbeek, H. - \ 2009
Ecology 90 (2009)4. - ISSN 0012-9658 - p. 945 - 960.
structured population-models - body-mass - red deer - large herbivores - winter weather - wild reindeer - moose calves - bottom-up - top-down - dynamics
We analyze an age-, size- and sex-structured model to investigate how the interplay between individual-level energy budget dynamics and the feedback of population grazing on resources shapes the individual life history and the dynamics of ungulate populations, living in a predator-free, seasonal resource environment. We formulate a dynamic energy budget model for individual energetics, which accounts for energy requirements for maintenance and growth, and possibly pregnancy and lactation. Growth in structural mass is assumed prescribed. Dynamics of energy reserves are the resultant of energy acquisition through grazing and suckling of milk and the aforementioned energyconsuming processes. The dynamic energy budget model is used as the core for an individualbased population model, which captures general features of ungulate life history and population dynamics, although it is parameterized for a particular system. Model predictions reveal a characteristic dynamic pattern, in which years with low death tolls (,10% of the population dying) alternate with a single year of high death toll (up to 40% of the population dies). In these ‘‘collapse’’ years almost all individuals younger than 2 years die, creating holes in the population age distribution. The die-off of these age classes is shown to be caused by the energy requirements for growth that these individuals face. Individuals between 1 and 2 years of age are more at risk than foals, because they are burdened with the legacy of a poor body condition developed throughout their first winter. The characteristic dynamic pattern is more pronounced at high levels of resource productivity. In contrast, neither a period of snow cover, during which all foraging stops, nor a dependence of fecundity on female body condition change dynamics significantly.
Bluetongue epidemiology and modelling: a risk map for epidemic potential in the Netherlands
Koeijer, A.A. de; Hartemink, N. ; Boender, G.J. ; Elbers, A.R.W. ; Heesterbeek, H. - \ 2007
Lelystad : Animal Sciences Group (Report / Animal Sciences Group 07/100410)
Quantifying BSE control by calculating the basic reproduction ratio R0 for the infection among cattle
Koeijer, A.A. de; Heesterbeek, H. ; Schreuder, B.E.C. ; Oberthur, R. ; Wilesmith, J. ; Roermund, H.J.W. van; Jong, M.C.M. de - \ 2004
Journal of Mathematical Biology 48 (2004)1. - ISSN 0303-6812 - p. 1 - 22.
bovine spongiform encephalopathy - transmission dynamics - rendering procedures - united-kingdom - british cattle - great-britain - scrapie - epidemiology - agents - herds
The safety of using meat and bone meal (MBM) in mammal feed was studied in view of BSE, by quantifying the risk of BSE transmission through different infection routes. This risk is embodied in the basic reproduction ratio R(0) of the infection, i.e. the average number of new infections induced by one initial infection. Only when R(0) is below 1, will the disease die out with certainty and the population will become free from BSE. Unfortunately this is a slow process due to the slow progression of the disease. We calculate R(0) explicitly from basic ingredients taking several different transmission routes into account. Several of the basic ingredients are functions of age or of infection-age. We also calculate the exponential growth rate r in terms of the same basic ingredients. Next we quantify the ingredients from available data and compute the effects on R(0) of various scenario's for controlling BSE, with examples for the UK and the Netherlands
Modelling transmission: mass action and beyond
Jong, M.C.M. de; Bouma, A. ; Diekmann, O. ; Heesterbeek, H. - \ 2002
Trends in Ecology and Evolution 17 (2002)2. - ISSN 0169-5347 - p. 64 - 65.
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