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162 results on '"van Knapen, Frans"'

14. Helminth parasites in black rats (Rattus rattus) and brown rats (Rattus norvegicus) from different environments in the Netherlands

Author

Franssen, Frits, Swart, Arno, van Knapen, Frans, van der Giessen, Joke, dIRAS RA-I&I RA, dIRAS RA-1, LS IRAS VPH VV (veterinaire volksgezh.), Risk Assessment, dIRAS RA-I&I RA, dIRAS RA-1, LS IRAS VPH VV (veterinaire volksgezh.), Risk Assessment, and Netherlands Food and Consumer Product Safety Authority (NVWA)

Subjects
0301 basic medicine, Veterinary medicine, antibiotic resistance, Brown rat, Rift Valley Fever, Trichinella, Syphacia, Trichuris muris, e. coli, Original Research Article, Hymenolepis (tapeworm), black rat, training, biology, pigs, 030108 mycology & parasitology, Hymenolepis diminuta, intestinal helminths, food safety, Black rat, outbreaks, epidemiology, escherichia coli, brown rat, Hymenolepis nana, esbl, Plagiorchis, food.ingredient, wildlife, malaria, mosquito, Environmental Science (miscellaneous), Rattus rattus, lcsh:Infectious and parasitic diseases, 03 medical and health sciences, one health, food, parasitic diseases, Helminths, lcsh:RC109-216, antimicrobial resistance, brown rat, Rattus norvegicus, black rat, Rattus rattus, intestinal helminths, Hymenolepis, Syphacia, Trichinella, research, sweden, zoonosis, biology.organism_classification, Rattus norvegicus, infection, zoonoses, 030104 developmental biology, Africa, Hymenolepis
Abstract

Background : Rattus norvegicus (brown rat) and Rattus rattus (black rat) are known carriers of bacteria, viruses, and parasites of zoonotic and veterinary importance. Moreover, rats may play a role in the transmission of muscle larvae of the zoonotic nematode Trichinella spiralis to farm animals. We aimed to study the intestinal and intramuscular helminths in wild rats from three different environments to assess the relevance of rats as carrier of zoonotic parasites for public health. Materials and methods : Wild brown rats (117 individuals) and black rats (44 individuals) were captured at farms, in suburban and in rural environments in the Netherlands. Intestinal helminths were isolated and identified morphologically. Artificial digestion was used to isolate muscle larvae. Results and discussion : Morphological analysis of rat intestinal contents yielded six nematode species ( Syphacia muris , Heterakis spumosa , Aonchotheca murissylvatici , Trichuris muris , Nippostrongylus brasiliensis, and Strongyloides sp.), three cestode species ( Hymenolepis diminuta , H. nana and Hymenolepis (=Rodentolepis) fraterna ), and four trematode species ( Plagiorchis muris , Plagiorchis proximus , Echinostoma chloropodis , and Notocotylus imbricatus ). Black rats at farms displayed the lowest intestinal helminth species variation (six species) and carried overall on average 0.93 species simultaneously. In comparison, brown rats at farms carried seven helminth species and 1.91 species simultaneously. Brown rats from suburban environments displayed the highest species variation (11 species) at 1.82 simultaneous helminth species. Absence of trematodes from rats at farms may suggest limited exchange of rats between farms and surrounding wet rural environments. We report four species of veterinary ( Syphacia muris ) or zoonotic relevance ( Hymenolepis diminuta , Hymenolepis nana and Plagiorchis muris ). We did not find Trichinella muscle larvae, consistent with long-term prevalence in Dutch wild rats. Keywords: brown rat; Rattus norvegicus; black rat; Rattus rattus; intestinal helminths; Hymenolepis; Syphacia; Trichinella (Published: 17 May 2016) Citation: Infection Ecology and Epidemiology 2016, 6: 31413 - http://dx.doi.org/10.3402/iee.v6.31413

Published
2016

17. Bayesian estimation of diagnostic accuracy of a new bead-based antibody detection test to reveal Toxoplasma gondii infections in pig populations

Author

Risk Assessment, Infection & Immunity, dIRAS RA-I&I RA, LS IRAS VPH VV (veterinaire volksgezh.), Sub IRAS EEPI Algemeen, Dep IRAS, Bokken, Gertie C A M, Portengen, Lützen, Cornelissen, Jan B W J, Bergwerff, Aldert A, van Knapen, Frans, Risk Assessment, Infection & Immunity, dIRAS RA-I&I RA, LS IRAS VPH VV (veterinaire volksgezh.), Sub IRAS EEPI Algemeen, Dep IRAS, Bokken, Gertie C A M, Portengen, Lützen, Cornelissen, Jan B W J, Bergwerff, Aldert A, and van Knapen, Frans

Published
2015

18. Pet travel: should vets do more?

Author

Bourne, Debra, primary, van Knapen, Frans, additional, Morgan, Eric, additional, Tappin, Simon, additional, Toth, Balazs, additional, Deplazes, Peter, additional, Tasker, Séverine, additional, Mason, Victoria, additional, Fitzgerald, Ronan, additional, Stokes, Laura, additional, and Richards, Diane, additional

Published
2015
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20. Best urban water management practices to prevent waterborne infectious diseases under current and future scenarios

Author

Advances in Veterinary Medicine, Risk Assessment of Toxic and Immunomodulatory Agents, Dep IRAS, van Knapen, Frans, de Roda Husman, Ana Maria, Leenen, E.J.T.M., de Man-van der Vliet, H., Advances in Veterinary Medicine, Risk Assessment of Toxic and Immunomodulatory Agents, Dep IRAS, van Knapen, Frans, de Roda Husman, Ana Maria, Leenen, E.J.T.M., and de Man-van der Vliet, H.

Published
2014

21. Man and pigs: sharing the same C. difficile

Author

Advances in Veterinary Medicine, Dep IRAS, van Knapen, Frans, Lipman, Len, Keessen, E.C., Advances in Veterinary Medicine, Dep IRAS, van Knapen, Frans, Lipman, Len, and Keessen, E.C.

Published
2013

23. Biotracing microbial contaminants in food chains - Salmonella on pork

Author

Risk Assessment of Toxic and Immunomodulatory Agents, Dep IRAS, Havelaar, Arie, van Knapen, Frans, Pielaat, A., Smid, J.H., Risk Assessment of Toxic and Immunomodulatory Agents, Dep IRAS, Havelaar, Arie, van Knapen, Frans, Pielaat, A., and Smid, J.H.

Published
2012

24. Bovine and equine forensic DNA analysis

Author

Advances in Veterinary Medicine, Dep IRAS, van Knapen, Frans, Lenstra, Hans, van de Goor, L.H.P., Advances in Veterinary Medicine, Dep IRAS, van Knapen, Frans, Lenstra, Hans, and van de Goor, L.H.P.

Published
2011

25. Toxoplasma gondii in animal reservoirs and the environment

Author

Risk Assessment of Toxic and Immunomodulatory Agents, Dep IRAS, van Knapen, Frans, van der Giessen, J.W.B., Opsteegh, M., Risk Assessment of Toxic and Immunomodulatory Agents, Dep IRAS, van Knapen, Frans, van der Giessen, J.W.B., and Opsteegh, M.

Published
2011

29. Aspects of quality assurance in processing natural sausage casings

Author

Risk Assessment of Toxic and Immunomodulatory Agents, Dep IRAS, van Knapen, Frans, Fink-Gremmels, Johanna, Berends, Boyd, Wijnker, J.J., Risk Assessment of Toxic and Immunomodulatory Agents, Dep IRAS, van Knapen, Frans, Fink-Gremmels, Johanna, Berends, Boyd, and Wijnker, J.J.

Published
2009

30. Elimination of micro-organisms in water treatment

Author

Risk Assessment of Toxic and Immunomodulatory Agents, Dep IRAS, Havelaar, Arie, van Knapen, Frans, Medema, G.J., Hijnen, W.A.M., Risk Assessment of Toxic and Immunomodulatory Agents, Dep IRAS, Havelaar, Arie, van Knapen, Frans, Medema, G.J., and Hijnen, W.A.M.

Published
2009

44. Surface Plasmon Resonance Biosensors for Detection of Pathogenic Microorganisms: Strategies to Secure Food and Environmental Safety.

Author

Bergwerff, Aldert A. and van Knapen, Frans

Subjects
*SURFACE plasmon resonance, *BIOSENSORS, *FOOD chemistry, *FOOD safety, *PATHOGENIC microorganisms
Abstract

The article describes the exploitation of exclusively optical surface plasmon resonance biosensors for the direct and indirect detection of pathogenic microorganisms in food chains and the environment. Direct detection is facilitated by the use of defined monoclonal or polyclonal antibodies raised against the target pathogenic microorganisms. The surface plasmon resonance technology can detect microbial agents with a good possibility for identification at the species, subspecies, and strain level.

Published
2006

46. Immunochemical detection of Salmonella group B, D and E using an optical surface plasmon resonance biosensor

Author

Bokken, Gertie C.A.M., Corbee, Ronald J., van Knapen, Frans, and Bergwerff, Aldert A.

Subjects
FOODBORNE diseases, SALMONELLA
Abstract

A surface plasmon resonance biosensor (Biacore) was used to detect Salmonella through antibodies reacting with Salmonella group A, B, D and E (Kauffmann–White typing). In the assay designed, anti-Salmonella antibodies immobilized to the biosensor surface were allowed to bind injected bacteria followed by a pulse with soluble anti-Salmonella immunoglobulins to intensify the signal. No significant interference was found for (mixtures of) 30 non-Salmonella serovars at 109 CFU ml−1. A total of 53 Salmonella serovars were successfully detected at 1×107 CFU ml−1, except those of groups C, G, L and P, as expected. The cut-off point was determined with an equicellular mixture of Salmonella enteritidis and Salmonella typhimurium at a final amount of 1.7×103 CFU per test portion. Although further work is needed to cover the detection of all relevant Salmonella serovars in food-producing animals and food products, this work demonstrates the merits of this alternative biosensor approach in terms of automation, sensitivity, specificity, simple handling and limited hands-on time. [Copyright &y& Elsevier]

Published
2003
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49. Meningeal Irritation: Possible Manifestation of Cerebral Echinococcus Infestation

Author

Dietrichs, Espen, Van Knapen, Frans, and Bakke, SØRen

Abstract

A patient with meningeal irritation and a small occipital cystic lesion is presented. Based on serological tests, the condition was diagnosed as presumably echinococcosis. To our knowledge, meningeal irritation has previously not been reported as an early symptom of cerebral Echinococcus infestation. Cysticercosis is discussed as a possible differential diagnosis.

Published
1994
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50. Fuchs' Heterochromic Iridocyclitis Is Not Associated With Ocular Toxoplasmosis

Author

Hey, Ellen La, Rothova, Aniki, Baarsma, G. Seerp, de Vries, Jelle, van Knapen, Frans, and Kijlstra, Aize

Abstract

• To analyze the association between Fuchs' heterochromic iridocyclitis (FHI) and toxoplasmosis, we performed ocular examinations and used various specific laboratory tests to establish a role for Toxoplasma gondii in the pathogenesis of FHI. Results were compared with those for other types of uveitis and healthy controls. Of the 88 patients with FHI, nine (10.2%) had toxoplasmosislike scars, but an association could not be proved by the indirect immunofluorescence antibody test or enzyme-linked immunosorbent assay, or by a test for cellular immunity to Toxoplasma antigen. Analysis of aqueous humor samples for Toxoplasma antibodies in patients with FHI also yielded negative results. On the basis of the negative results of these laboratory tests, we concluded that FHI is not associated with ocular toxoplasmosis.

Published
1992
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