Jacobus Joannes (Sjaak) de Wit

Professor Integrated Poultry Health

Utrecht University

Netherlands

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Jacobus Joannes (Sjaak) de Wit is a Professor of Integrated Poultry Health at Utrecht University in the Netherlands. His research focuses on avian health, including the impacts of bacterial infections on poultry hatchability and performance, as well as the development of rapid diagnostic assays for avian viruses. He has received the Bart Rispens Research Award for his significant contributions to the field, as evidenced by his recent publications on poultry pathogens and vaccine efficacy.

Articles (16)

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2025

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2023

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2020

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2020

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2020

Collaborators (1)

Damer Blake

Professor of Parasite genetics

Royal Veterinary College - Hawkshead Campus

UNITED KINGDOM

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Jacobus Joannes (Sjaak) de Wit

Research Interests

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Articles (16)

Bart Rispens Research Award 2025 for the best paper published in Avian Pathology (volumes 52 and 53)

Severe effects of Escherichia coli and Enterococcus faecalis on hatchability and first-week performance following inoculation of 18-day-incubated embryonated broiler eggs

Co-infections of Enterococcus cecorum and various avian pathogens resulted in varying rates of SPF broilers with an E. cecorum infection

Development and Laboratory Validation of Rapid, Bird-Side Molecular Diagnostic Assays for Avian Influenza Virus Including Panzootic H5Nx

The complexity of the interpretation of ELISA and RT-PCR results in the diagnosis of a reticuloendotheliosis virus infection: an extended case study

The combination of infectious bronchitis virus BR1 and Mass vaccines provides broad protection

Molecular characterization of the HMTp210 gene of Avibacterium paragallinarum and the proposition of a new genotyping method as alternative for classical serotyping

Genetic analysis of infectious bronchitis virus (IBV) in vaccinated poultry populations over a period of 10 years

The inactivated infectious bronchitis virus (IBV) vaccine used as booster in layer hens influences the breadth of protection against challenge with IBV variants

Clinical expression, epidemiology, and monitoring of Mycoplasma gallisepticum and Mycoplasma synoviae: an update

High specificity of the Salmonella Pullorum/Gallinarum rapid plate agglutination test despite vaccinations against Salmonella Enteritidis and Salmonella Typhimurium

In ovo application of a live infectious bursal disease vaccine to commercial broilers confers proper immunity

Decrease of Mycoplasma gallisepticum seroprevalence and introduction of new genotypes in Dutch commercial poultry during the years 2001–2018

Spotlight on avian coronaviruses

Characterization of infectious bronchitis virus D181, a new serotype (GII-2)

Major difference in clinical outcome and replication of a H3N1 avian influenza strain in young pullets and adult layers

Collaborators (1)

Damer Blake

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