Dr. F.C. (Francisca) Velkers

Dr. F.C. (Francisca) Velkers

Associate Professor
Veterinary Epidemiology
+31 30 253 4447
f.c.velkers@uu.nl

Publications

2022

Scholarly publications

Sikkema, R. S., Begeman, L., Janssen, R., Wolters, W. J., Geurtsvankessel, C., de Bruin, E., Hakze-van der Honing, R. W., Eblé, P., van der Poel, W. H. M., van den Brand, J. M. A., Slaterus, R., La Haye, M., Koopmans, M. P. G., Velkers, F., & Kuiken, T. (2022). Risks of SARS-CoV-2 transmission between free-ranging animals and captive mink in the Netherlands. Transboundary and emerging diseases. https://doi.org/10.1111/tbed.14686
Elbers, A. R. W., Gonzales, J. L., Koene, M. G. J., Germeraad, E. A., Hakze-van der Honing, R. W., van der Most, M., Rodenboog, H., & Velkers, F. C. (2022). Monitoring Wind-Borne Particle Matter Entering Poultry Farms via the Air-Inlet: Highly Pathogenic Avian Influenza Virus and Other Pathogens Risk. FEMS Microbiology Immunology, 11(12), [1534]. https://doi.org/10.3390/pathogens11121534
Kers, J. G., Velkers, F. C., Fischer, E. A. J., Stegeman, J. A., Smidt, H., & Hermes, G. D. A. (2022). Conserved developmental trajectories of the cecal microbiota of broiler chickens in a field study. FEMS Microbiology Ecology, 98(9), 1-11. [fiac090]. https://doi.org/10.1093/femsec/fiac090
Wolters, W. J., Rooij, M. M. T. D., Molenaar, R. J., Rond, J. D., Vernooij, J., Meijer, P. A., Munnink, B. B. O., Sikkema, R., Spek, A. N. V. D., Spierenburg, M. A. H., Honing, R. H. . V., VanderPoel, W., Koopmans, M., Stegeman, A., Smit, L. AM., Augustijn-Schretlen, M., & Velkers, F. (2022). Manifestation of SARS-CoV-2 Infections in Mink Related to Host-, Virus- and Farm-Associated Factors, The Netherlands 2020. Viruses, 14(8), 1-20. [1754]. https://doi.org/10.3390/v14081754
Oost, M. J., Ijaz, A., van Haarlem, D. A., van Summeren, K., Velkers, F. C., Kraneveld, A. D., Venema, K., Jansen, C. A., Pieters, R. H. H., & Ten Klooster, J. P. (2022). Chicken-derived RSPO1 and WNT3 contribute to maintaining longevity of chicken intestinal organoid cultures. Scientific Reports, 12(1), 1-12. [10563]. https://doi.org/10.1038/s41598-022-14875-7
Schreuder, J., de Knegt, H. J., Velkers, F. C., Elbers, A. R. W., Stahl, J., Slaterus, R., Stegeman, J. A., & de Boer, W. F. (2022). Wild Bird Densities and Landscape Variables Predict Spatial Patterns in HPAI Outbreak Risk across The Netherlands. FEMS Microbiology Immunology, 11(5), 1-14. [549]. https://doi.org/10.3390/pathogens11050549
Santos, R. R., Velkers, F. C., Vernooij, J. C. M., Star, L., Heerkens, J. L. T., Harn, J. V., & Jong, I. C. D. (2022). Nutritional interventions to support broiler chickens during Eimeria infection. Poultry Science, 101(6), 1-12. [101853]. https://doi.org/10.1016/j.psj.2022.101853
Meijerink, N., de Oliveira, J. E., van Haarlem, D. A., Lamot, D. M., Velkers, F. C., Smidt, H., Stegeman, J. A., Rutten, V. P. M. G., & Jansen, C. A. (2022). Long-chain glucomannan supplementation modulates immune responsiveness, as well as intestinal microbiota, and impacts infection of broiler chickens with Salmonella enterica serotype Enteritidis. Veterinary Research, 53(1), 1-20. [9]. https://doi.org/10.1186/s13567-022-01026-z
van Aart, A. E., Velkers, F. C., Fischer, E. A. J., Broens, E. M., Egberink, H., Zhao, S., Engelsma, M., Hakze-van der Honing, R. W., Harders, F., de Rooij, M. M. T., Radstake, C., Meijer, P. A., Munnink, B. B. O., de Rond, J., Sikkema, R. S., van der Spek, A. N., Spierenburg, M., Wolters, W. J., Molenaar, R-J., ... Smit, L. A. M. (2022). SARS-CoV-2 infection in cats and dogs in infected mink farms. Transboundary and emerging diseases, 69(5), 3001-3007. https://doi.org/10.1111/tbed.14173

2021

Scholarly publications

Lu, L., Sikkema, R. S., Velkers, F. C., Nieuwenhuijse, D. F., Fischer, E. A. J., Meijer, P. A., Bouwmeester-Vincken, N., Rietveld, A., Wegdam-Blans, M. C. A., Tolsma, P., Koppelman, M., Smit, L. A. M., Honing, R. W. H. D., Poel, W. H. M. V. D., Spek, A. N. V. D., Spierenburg, M. A. H., Molenaar, R. J., Rond, J. D., Augustijn-Schretlen, M., ... Koopmans, M. P. G. (2021). Adaptation, spread and transmission of SARS-CoV-2 in farmed minks and related humans in the Netherlands. (pp. 1-40). bioRxiv. https://doi.org/10.1101/2021.07.13.452160
Tobias, T. J., Caekebeke, N., Jonquiere, F. J., Ringenier, M., van den Hoogen, A., Vernooij, J. C. M., Velkers, F. C., Postma, M., Houben, M., Zoons, J., De Koster, S., Sleeckx, N., Verhulst, C., Lammens, C., Dewulf, J., Kluytmans-van den Bergh, M. F. Q., Goossens, H., & Stegeman, J. A. (2021). Coaching aids in reduction of antimicrobial use and resistance in Belgian and Dutch pig farms: I-4-1-health project results. 71. Abstract from 12th European Symposium of Porcine Health Management.
Lu, L., Sikkema, R. S., Velkers, F. C., Nieuwenhuijse, D. F., Fischer, E. A. J., Meijer, P. A., Bouwmeester-Vincken, N., Rietveld, A., Wegdam-Blans, M. C. A., Tolsma, P., Koppelman, M., Smit, L. A. M., Hakze-van der Honing, R. W., van der Poel, W. H. M., van der Spek, A. N., Spierenburg, M. A. H., Molenaar, R. J., Rond, J. D., Augustijn, M., ... Koopmans, M. P. G. (2021). Adaptation, spread and transmission of SARS-CoV-2 in farmed minks and associated humans in the Netherlands. Nature Communications, 12(1), 1-12. [6802]. https://doi.org/10.1038/s41467-021-27096-9
Oost, M. J., Velkers, F. C., Kraneveld, A. D., & Venema, K. (2021). Development of the in vitro Cecal Chicken ALIMEntary tRact mOdel-2 to Study Microbiota Composition and Function. Frontiers in Microbiology, 12, 1-12. [726447]. https://doi.org/10.3389/fmicb.2021.726447
Heijne, M., Jelocnik, M., Umanets, A., Brouwer, M. S. M., Dinkla, A., Harders, F., van Keulen, L. J. M., Roest, H. J., Schaafsma, F., Velkers, F. C., van der Goot, J. A., Pannekoek, Y., & Koets, A. P. (2021). Genetic and phenotypic analysis of the pathogenic potential of two novel Chlamydia gallinacea strains compared to Chlamydia psittaci. Scientific Reports, 11(1), 1-12. [16516]. https://doi.org/10.1038/s41598-021-95966-9
Koster, S. D., Ringenier, M., Lammens, C., Stegeman, A., Tobias, T., Velkers, F., Vernooij, H., Bergh, M. K. D., Kluytmans, J., Dewulf, J., & Goossens, H. (2021). ESBL-Producing, Carbapenem- and Ciprofloxacin-Resistant Escherichia coli in Belgian and Dutch Broiler and Pig Farms: A Cross-Sectional and Cross-Border Study. Antibiotics, 10(8), 1-14. [945]. https://doi.org/10.3390/antibiotics10080945
Caekebeke, N., Ringenier, M., Jonquiere, F., Tobias, T., Postma, M., Hoogen, A. V. D., Houben, M., Velkers, F., Sleeckx, N., Stegeman, A., & Dewulf, J. (2021). Coaching Belgian and Dutch Broiler Farmers Aimed at Antimicrobial Stewardship and Disease Prevention. Antibiotics, 10(5), 1-14. [590]. https://doi.org/10.3390/antibiotics10050590
Oude Munnink, B. B., Sikkema, R. S., Nieuwenhuijse, D. F., Molenaar, R. J., Munger, E., Molenkamp, R., van der Spek, A., Tolsma, P., Rietveld, A., Brouwer, M., Bouwmeester-Vincken, N., Harders, F., Hakze-van der Honing, R., Wegdam-Blans, M. C. A., Bouwstra, R. J., GeurtsvanKessel, C., van der Eijk, A. A., Velkers, F. C., Smit, L. A. M., ... Koopmans, M. P. G. (2021). Transmission of SARS-CoV-2 on mink farms between humans and mink and back to humans. Science (New York, N.Y.), 371(6525), 172-177. https://doi.org/10.1126/science.abe5901
Meijerink, N., van Haarlem, D. A., Velkers, F. C., Stegeman, A. J., Rutten, V. P. M. G., & Jansen, C. A. (2021). Analysis of chicken intestinal natural killer cells, a major IEL subset during embryonic and early life. Developmental and Comparative Immunology, 114, 1-11. [103857]. https://doi.org/10.1016/j.dci.2020.103857
Schreuder, J., Manders, T. T. M., Elbers, A. R. W., van der Spek, A. N., Bouwstra, R. J., Stegeman, J. A., & Velkers, F. C. (2021). Highly pathogenic avian influenza subtype H5Nx clade 2.3.4.4 outbreaks in Dutch poultry farms, 2014-2018: Clinical signs and mortality. Transboundary and emerging diseases, 68(1), 88-97. https://doi.org/10.1111/tbed.13597
Velkers, F. C., Manders, T. T. M., Vernooij, J. C. M., Stahl, J., Slaterus, R., & Stegeman, J. A. (2021). Association of wild bird densities around poultry farms with the risk of highly pathogenic avian influenza virus subtype H5N8 outbreaks in the Netherlands, 2016. Transboundary and emerging diseases, 68, 76-87. https://doi.org/10.1111/tbed.13595

2020

Scholarly publications

Schreuder, J., Velkers, F. C., Bossers, A., Bouwstra, R. J., de Boer, W. F., van Hooft, P., Stegeman, J. A., & Jurburg, S. D. (2020). Temporal Dynamics of Cloacal Microbiota in Adult Laying Chickens With and Without Access to an Outdoor Range. Frontiers in Microbiology, 11. https://doi.org/10.3389/fmicb.2020.626713
Tobias, T. J., Caekebeke, N., Jonquiere, F. J., Vernooij, J. C. M., van den Hoogen, A., Ringenier, M., Velkers, F. C., Postma, M., Houben, M., Zoons, J., De Koster, S., Sleeckx, N., Verhulst, C., Kluytmans-van den Bergh, M. F. Q., Lammens, C., Goossens, H., Dewulf, J., & Stegeman, J. A. (2020). Reduction of antimicrobial use and resistance in Belgian and Dutch pig farms; i-4-1-Health project results. 458. Abstract from 26th International Pig Veterinary Society Congress, Rio de Janeiro, Brazil.
Houben, M., Caekebeke, N., van den Hoogen, A., Ringenier, M., Tobias, T. J., Jonquiere, F. J., Sleeckx, N., Velkers, F. C., Stegeman, J. A., Dewulf, J., & Postma, M. (2020). The ADKAR® change management model for farmer profiling with regard to antimicrobial stewardship in livestock production. Vlaams Diergeneeskundig Tijdschrift, 89(6), 309-314. https://doi.org/10.21825/vdt.v89i6.17413
https://dspace.library.uu.nl/bitstream/handle/1874/410834/17413_Article_Text_33903_1_10_20210107.pdf?sequence=1
i-4-1-Health Study Group (2020). Comparing Farm Biosecurity and Antimicrobial Use in High-Antimicrobial-Consuming Broiler and Pig Farms in the Belgian–Dutch Border Region. Frontiers in Veterinary Science, 7, [558455]. https://doi.org/10.3389/fvets.2020.558455
Drijver, E. P. M. D., Stohr, J. J. J. M., Verweij, J. J., Verhulst, C., Velkers, F. C., Stegeman, A., Bergh, M. F. Q. K. D., Kluytmans, J. A. J. W., & Group, I-H. S. (2020). Limited Genetic Diversity of blaCMY-2-Containing IncI1-pST12 Plasmids from Enterobacteriaceae of Human and Broiler Chicken Origin in The Netherlands. Microorganisms, 8(11), [1755]. https://doi.org/10.3390/microorganisms8111755
Meijerink, N., Kers, J. G., Velkers, F. C., van Haarlem, D. A., Lamot, D. M., de Oliveira , J., Smidt, H., Stegeman, J. A., Rutten, V. P. M. G., & Jansen, C. A. (2020). Early Life Inoculation With Adult-Derived Microbiota Accelerates Maturation of Intestinal Microbiota and Enhances NK Cell Activation in Broiler Chickens. Frontiers in Veterinary Science, 7, 1-14. [584561]. https://doi.org/10.3389/fvets.2020.584561
Dame-Korevaar, A., Kers, J. G., van der Goot, J., Velkers, F. C., Ceccarelli, D., Mevius, D. J., Stegeman, A., & Fischer, E. A. J. (2020). Competitive Exclusion Prevents Colonization and Compartmentalization Reduces Transmission of ESBL-Producing Escherichia coli in Broilers. Frontiers in Microbiology, 11, [566619]. https://doi.org/10.3389/fmicb.2020.566619
Tatár-Kis, T., Fischer, E. A. J., Cazaban, C., Walkó-Kovács, E., Homonnay, Z. G., Velkers, F. C., Palya, V., & Stegeman, J. A. (2020). A herpesvirus of Turkey-based vector vaccine reduces transmission of newcastle disease virus in commercial broiler chickens with maternally derived antibodies. Vaccines, 8(4), [614]. https://doi.org/10.3390/vaccines8040614
Kers, J. G., Fischer, E. A. J., de Oliveira , J., Tersteeg - Zijderveld, M., Kostanti, P., Stegeman, J. A., Smidt, H., & Velkers, F. C. (2020). Associations between phenotypic characteristics and clinical parameters of broilers and intestinal microbial development throughout a production cycle: a field study. MicrobiologyOpen, 9(11), [e1114]. https://doi.org/10.1002/mbo3.1114
Hobbelen, P. H. F., Elbers, A. R. W., Werkman, M., Koch, G., Velkers, F. C., Stegeman, A., & Hagenaars, T. J. (2020). Estimating the introduction time of highly pathogenic avian influenza into poultry flocks. Scientific Reports, 10(1), [12388]. https://doi.org/10.1038/s41598-020-68623-w
Schreuder, J., Velkers, F. C., Bouwstra, R., Beerens, N., Stegeman, J. A., de Boer, F., van Hooft, P., Elbers, A., Bossers, A., & Jurburg, S. D. (2020). An observational field study of the cloacal microbiota in adult laying hens with and without access to an outdoor range. Animal Microbiome, 2(1), [28]. https://doi.org/10.1186/s42523-020-00044-6
Korevaar, M. A., Fischer, E. A. J., van der Goot, J., Velkers, F. C., Ceccarelli, D., Mevius, D. J., & Stegeman, J. A. (Accepted/In press). Early life supply of competitive exclusion products reduces colonization of Extended Spectrum Beta-Lactamase producing Escherichia coli in broilers. Poultry Science, 99(8), 4052-4064. https://doi.org/10.1016/j.psj.2020.04.025

Professional publications

Caekebeke, N., Ringenier, M., Postma, M., Jonquiere, F. J., Tobias, T. J., Velkers, F. C., Houben, M., Sleeckx, N., Van Dosselaer, I., Zoons, J., Pierré, E., Dewulf, J., & Stegeman, J. A. (2020, Jan 16). Vlaamse en Nederlandse vleeskuikenbedrijven begeleiden naar een lager antibioticagebruik: Resultaten van het Europees Interreg project i-4-1-Health. (96 ed.) Proefbedrijf Pluimveehouderij, Provincie Antwerpen.
https://dspace.library.uu.nl/bitstream/handle/1874/394447/Mededeling96_PV_def.pdf?sequence=1

2019

Scholarly publications

Fischer, E. A., Dierikx, C., van Essen-Zandbergen, A., Mevius, D., Stegeman, A., Velkers, F., & Klinkenberg, D. (2019). Competition between Escherichia coli with and without Extended-Spectrum-Beta-Lactamase-carrying plasmids in the broiler chicken gut. Applied and Environmental Microbiology, 85(17), e00892. https://www.mendeley.com/catalogue/8408e9b7-1dfc-3451-93af-57322bd283eb/
Kers, J. G., Fischer, E. A. J., Stegeman, J. A., Smidt, H., & Velkers, F. C. (2019). Comparison of Different Invasive and Non-Invasive Methods to Characterize Intestinal Microbiota throughout a Production Cycle of Broiler Chickens. Microorganisms, 7(10). https://doi.org/10.3390/microorganisms7100431
Dame-Korevaar, A., Fischer, E. A. J., van der Goot, J., Velkers, F., van den Broek, J., Veldman, K., Ceccarelli, D., Mevius, D., & Stegeman, A. (2019). Effect of challenge dose of plasmid-mediated extended-spectrum β-lactamase and AmpC β-lactamase producing Escherichia coli on time-until-colonization and level of excretion in young broilers. Veterinary Microbiology, (239), [108446]. https://doi.org/10.1016/j.vetmic.2019.108446
Fischer, E. A. J., Dierikx, C. M., van Essen-Zandbergen, A., Mevius, D., Stegeman, A., Velkers, F. C., & Klinkenberg, D. (2019). Competition between Escherichia coli populations with and without plasmids carrying a gene encoding extendedspectrum beta-lactamase in the broiler chicken gut. Applied and Environmental Microbiology, 85(17), [e00892]. https://doi.org/10.1128/AEM.00892-19
Schreuder, J., Velkers, F. C., Bouwstra, R. J., Beerens, N., Stegeman, J. A., de Boer, W. F., Elbers, A. R. W., van Hooft, P., Feberwee, A., Bossers, A., & Jurburg, S. D. (2019). Limited changes in the fecal microbiome composition of laying hens after oral inoculation with wild duck feces. Poultry Science, 98(12), 6542–6551. https://doi.org/10.3382/ps/pez526
Kers, J. G., Velkers, F. C., Fischer, E. A. J., Hermes, G. D. A., Lamot, D. M., Stegeman, J. A., & Smidt, H. (2019). Take care of the environment: housing conditions affect the interplay of nutritional interventions and intestinal microbiota in broiler chickens. Animal Microbiome, 1(1), [10]. https://doi.org/10.1186/s42523-019-0009-z

Other output

Caekebeke, N., van den Hoogen, A., Ringenier, M., Jonquiere, F. J., Tobias, T. J., Postma, M., Houben, M., Velkers, F. C., Sleeckx, N., Stegeman, J. A., & Dewulf, J. (2019). DIFFERENCES BETWEEN DUTCH AND BELGIAN PIG FARMERS WITH RESPECT TO THEIR BIOSECURITY LEVEL AND ANTIMICROBIAL USAGE WITHIN THE I-4-1-HEALTH PROJECT. 65. Abstract from 11th European Symposium of Porcine Health Management (ESPHM), Utrecht, Netherlands.

2018

Scholarly publications

van den Hoogen, A., Ringenier, M., Caekebeke, N., Velkers, F. C., Tobias, T. J., Postma, M., Houben, M., Zoons, J., Sleeckx, N., Verhulst, C., Kluytmans-van den Bergh, M. F. Q., Lammens, C., Dewulf, J., & Stegeman, J. A. (2018). Tailor-made coaching for antimicrobial reduction in pig farms within the Belgium-Dutch cross border project; i-4-1-Health. 169. Abstract from 25th International Pig Veterinary Society Congress 2018, Chonqqing, China.
https://dspace.library.uu.nl/bitstream/handle/1874/396508/Hoogen_i41health_IPVS2018.pdf?sequence=1
van den Hoogen, A., Ringenier, M., Caekebeke, N., Velkers, F. C., Tobias, T. J., Postma, M., Houben, M., Zoons, J., Sleeckx, N., Verhulst, C., Kluytmans-van den Bergh, M. F. Q., Lammens, C., Dewulf, J., & Stegeman, J. A. (2018). Tailor-made coaching for antimicrobial reduction in pig farms within the Belgium-Dutch cross border project; i-4-1-Health. 328. Abstract from 10th ESPHM Barcelona, Barcelona, Spain.
https://dspace.library.uu.nl/bitstream/handle/1874/396506/Hoogen_i41health_ESPHM2018.pdf?sequence=1
Van De Reep, L., Nielen, M., Verstappen, K. M. H. W., Broens, E. M., Van Den Broek, J., & Velkers, F. C. (2018). Response to a Salmonella Enteritidis challenge in old laying hens with different vaccination histories. Poultry Science, 97(8), 2733-2739. https://doi.org/10.3382/ps/pey134
Kers, J. G., Velkers, F. C., Fischer, E. A. J., Hermes, G., Stegeman, J. A., & Smidt, H. (2018). Host and Environmental Factors Affecting the Intestinal Microbiota in Chickens. Frontiers in Microbiology, 9, [235]. https://doi.org/10.3389/fmicb.2018.00235

2017

Scholarly publications

Kers, J. G., Velkers, F. C., Fischer, E. A. J., Stegeman, J. A., & Smidt, H. (2017). Host and Environmental Factors Affecting the Intestinal Microbiota in Chickens. In XXth World Veterinary Poultry Association Congress - Abstract book (pp. 240). [PS2-01]
Velkers, F. C., de Jong, I., van de Ven, L., van de Reep, L., & Stegeman, J. A. (2017). Comparison of Eimeria infection dynamics between broiler flocks with a conventional or on-farm hatching system. In XXth World Veterinary Poultry Association Congress - Abstract book (pp. 197). [PS6-06]
Velkers, F. C., Blokhuis, S. J., Veldhuis Kroeze, E. J. B., & Burt, S. A. (2017). The role of rodents in avian influenza outbreaks in poultry farms: a review. Veterinary Quarterly, 37(1), 182-194. https://doi.org/10.1080/01652176.2017.1325537
Dame-Korevaar, A., Fischer, E. A. J., Stegeman, A., Mevius, D., van Essen-Zandbergen, A., Velkers, F., & van der Goot, J. (2017). Dynamics of CMY-2 producing E. coli in a broiler parent flock. Veterinary Microbiology, 203, 211-214. https://doi.org/10.1016/j.vetmic.2017.03.024
Nordquist, R. E., van der Staay, F. J., van Eerdenburg, F. J. C. M., Velkers, F. C., Fijn, L., & Arndt, S. S. (2017). Mutilating procedures, management practices, and housing conditions that may affect the welfare of farm animals: Implications for welfare research. Animals, 7(2). https://doi.org/10.3390/ani7020012

Other output

Burt, S. A., & Velkers, F. C. (2017, Dec). De rol van knaagdieren bij uitbraken van vogelgriep op pluimveebedrijven.

2014

Scholarly publications

Velkers, F. C., Klinkenberg, D., Bouma, A., de Jong, M. C. M., & Stegeman, J. A. (2014). Understanding infection dynamics of Eimeria spp. in broiler flocks to improve coccidiosis research and control. In 11th International Coccidiosis Conference (ICC 2014), Dresden, Germany (pp. 27)

2012

Scholarly publications

Velkers, F. C., Bouma, A., Stegeman, J. A., & de Jong, M. C. M. (2012). Effects of transmission of a live Eimeria acervulina vaccine strain on infection dynamics with a homologous wild-type strain in broilers. In Proceedings of the 13th Symposium of the International Society for Veterinary Epidemiology and Economics (ISVEE XIII), Belgium, The Netherlands (pp. 192). International Symposia on Veterinary Epidemiology and Economics. https://doi.org/10.1016/j.vaccine.2011.10.090
Velkers, F. C., Bouma, A., Stegeman, J. A., & de Jong, M. C. M. (2012). Oocyst output and transmission rates during successive infections with Eimeria acervulina in experimental broiler flocks. Veterinary Parasitology, 187(1-2), 63-71. https://doi.org/10.1016/j.vetpar.2011.12.032

2011

Scholarly publications

Velkers, F. C., van de Graaf-Bloois, L., Wagenaar, J., Westendorp, S. T., van Bergen, M. A. P., Dwars, R. M., & Landman, W. J. M. (2011). Enterococcus hirae-associated endocarditis outbreaks in broiler flocks: clinical and pathological characteristics and molecular epidemiology. Veterinary Quarterly, 31(1), 3-17. https://doi.org/10.1080/01652176.2011.570107
Velkers, F. C., Dieho, K., Pecher, F., Vernooij, J. C. M., van Eck, J. H. H., & Landman, W. J. M. (2011). Efficacy of allicin from garlic against Ascaridia galli infection in chickens. Poultry Science, 90(2), 364-368. https://doi.org/10.3382/ps.2010-01090
Velkers, F. C. (2011). Transmission dynamics of Eimeria acervulina in broilers. [Doctoral thesis 3 (Research UU / Graduation NOT UU), Wageningen University & Research].

2010

Scholarly publications

Velkers, F. C., Bouma, A., Graat, E. A. M., Klinkenberg, D., Stegeman, J. A., & de Jong, M. C. M. (2010). Eimeria acervulina: The influence of inoculation dose on transmission between broiler chickens. Experimental Parasitology, 125(3), 286-296. https://doi.org/10.1016/j.exppara.2010.02.005
Velkers, F. C., Blake, D. P., Graat, E. A. M., Vernooij, J. C. M., Bouma, A., de Jong, M. C. M., & Stegeman, J. A. (2010). Quantification of Eimeria acervulina in faeces of broilers: Comparison of McMaster oocyst counts from 24 h faecal collections and single droppings to real-time PCR from cloacal swabs. Veterinary Parasitology, 169(1-2), 1-7. https://doi.org/10.1016/j.vetpar.2010.01.001
Velkers, F. C., Swinkels, W. J. C., Rebel, J. M. J., Bouma, A., Daemen, A. J. J. M., Klinkenberg, D., Boersma, W. J. A., Stegeman, J. A., de Jong, M. C. M., & Heesterbeek, J. A. P. (2010). Effect of Eimeria acervulina infection history on the immune response and transmission in broilers. Veterinary Parasitology, 173(3-4), 184-192. https://doi.org/10.1016/j.vetpar.2010.07.005

2009

Scholarly publications

Velkers, F. C., Dieho, K., Pecher, F., van Eck, J. H. H., & Landman, W. J. M. (2009). Efficacy of allicin from garlic against Ascaridia galli infection in chickens. In XIth World Veterinary Poultry Association Congress (WVPC 2009), Marrakesh, Morocco (pp. 194)
Velkers, F. C., Bouma, A., Stegeman, J. A., & de Jong, M. C. M. (2009). Transmission of Eimeria acervulina in a group of broiler chickens. In ISVEE 12: Proceedings of the 12th Symposium of the International Society for Veterinary Epidemiology and Economics, Durban, South Africa (pp. 578). International Symposia on Veterinary Epidemiology and Economics. http://www.sciquest.org.nz/elibrary/download/68051/T6-P28%2B-%2BTransmission%2Bof%2BEimeria%2Bacervulina%2Bin%2Ba%2Bgroup%2Bof%2Bbroiler%2Bchickens

2008

Scholarly publications

Matthijs, M. G. R., Bouma, A., Velkers, F. C., van Eck, J. H. H., & Stegeman, J. A. (2008). Transmissibility of Infectious Bronchitis Virus H120 Vaccine Strain Among Broilers under Experimental Conditions. Avian Diseases, 52(3), 461-466. https://doi.org/10.1637/8204-010708-Reg.1

2007

Scholarly publications

Velkers, F. C., Graat, E. A. M., Bouma, A., Stegeman, J. A., & de Jong, M. C. M. (2007). Transmission of Eimeria acervulina in broiler chickens. In Proceedings of the XV World Veterinary Poultry Association Congress (WVPC 2007), Beijing, China  (pp. 272)
Velkers, F. C., van der Graaf - van Bloois, L., Wagenaar, J., Westendorp, S. T., Bergen, M. A. P., & Landman, W. J. M. (2007). Enterococcus durans-associated endocarditis in broilers. In Proceedings of the XV World Veterinary Poultry Association Congress (WVPC 2007), Beijing, China  (pp. 252)
Velkers, F. C., Graat, E. A. M., Stegeman, J. A., & de Jong, M. C. M. (2007). Transmission of Eimeria acervulina in broiler chickens. In Proceedings of the 19th annual meeting of the VEEC, Utrecht (pp. 43-45) http://www.veec.nl/

2006

Scholarly publications

Velkers, F. C., Graat, E. A. M., de Jong, M. C. M., & Stegeman, J. A. (2006). Quantification of transmission of Eimeria acervulina in broilers : A one-to-one transmission experiment. In ISVEE 11: Proceedings of the 11th Symposium of the International Society for Veterinary Epidemiology and Economics, Cairns, Australia (pp. 489). International Symposia on Veterinary Epidemiology and Economics. http://www.sciquest.org.nz/elibrary/download/64105/T4-P26%2B-%2BQuantification%2Bof%2Btransmission%2Bof%2BEimeria%2Bacervulina%2Bin%2Bbroilers%2B%253A%2BA%2Bone-to-one%2Btransmission%2Bexperiment
Velkers, F. C., Bouma, A., Matthijs, M. G. R., Koch, G., Westendorp, S. T., & Stegeman, J. A. (2006). Outbreak of avian influenza H7N3 on a turkey farm in the Netherlands. Veterinary Record, 159(13), 403-405. http://veterinaryrecord.bmj.com/content/159/13/403

2005

Scholarly publications

Velkers, F. C., Graat, E. A. M., Stegeman, J. A., & de Jong, M. C. M. (2005). Comparison of E. acervulina oocyst counts in single droppings of broilers and in droppings collected during 24 hours. In A. Gruber, & A. A. Mendes (Eds.), Proceedings of the IXth International Coccidiosis Conference, Foz do Iguassu, Parana, Brazil (pp. 174). FACTA - APINCO Foundation of Poultry Science and Technology. http://www.facta.org.br
Velkers, F. C., te Loo, A. J. H., Madin, F., & van Eck, J. H. H. (2005). Isopathic and pluralist homeopathic treatment of commercial broilers with experimentally induced colibacillosis. Research in Veterinary Science, 78(1), 77-83. https://doi.org/10.1016/j.rvsc.2004.06.005