de Wit Research Group

The goal of the Molecular Pathogenesis Section (MPS) is to increase our understanding of the pathogenesis of emerging respiratory viruses on every level, from host to molecule. We study the pathogenesis of SARS-CoV-2, Nipah virus, and the highly pathogenic avian influenza H5N1 virus in animal models and human lung and brain organoids.

de Wit Research Group members

Molecular Pathogenesis Section, 2025. Left to right: Tessa Lutterman, B.S.; Bridget Brackney, B.S.; Meaghan Flagg, Ph.D.; Gayatri Subramanian, Ph.D.; Brandi Williamson, M.P.H.; Kerry Goldin, DVM; Emmie de Wit, Ph.D.; Johan Ortiz-Morales, B.S.; Christopher Winski, Ph.D.

Credit: NIAID

Emmie de Wit, Ph.D.

Senior Investigator, Molecular Pathogenesis Section

Education:

Ph.D., Erasmus University Rotterdam, Netherlands

Dr. de Wit received her Ph.D. in virology from Erasmus University Rotterdam, the Netherlands. Her research there focused on the replication, pathogenesis, and transmission of influenza A virus. Dr. de Wit then moved to the Laboratory of Virology of NIAID in Hamilton, Montana, to work in the biosafety level 4 laboratory there. When SARS-CoV-2 emerged in late 2019, Dr. de Wit focused her research on SARS-CoV-2, developing animal models and using those for testing of medical countermeasures and gaining a better understanding of SARS-CoV-2 pathogenesis.

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Bridget G. Brackney, B.S.

Postbaccalaureate IRTA Fellow

Education:

B.S., Brigham Young University – Idaho, Rexburg, ID

Bridget is interested in virus-host interactions and the impact of the immune system on pathogenesis. She will be working on evaluating the role of microglia in the host response to viral infections in cerebral organoids.

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Meaghan Flagg, Ph.D.

Postdoctoral IRTA Fellow

Education:

Ph.D., Harvard University

Meaghan is interested in the immune response and immunopathogenesis of viral infections at mucosal surfaces. She uses 3D human respiratory organoid models to study how viruses and the immune response impact epithelial cell function and tissue repair.

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Kerry Goldin, DVM

Graduate Student

Education:

St. Petersburg College, St. Petersburg, FL 
University of Minnesota, St. Paul, MN

Kerry studies neuropathology associated with emerging respiratory viruses, including Nipah virus and SARS-CoV-2. Prior to coming to NIH, she graduated from veterinary school and completed a residency in Anatomic Pathology. Kerry is a Fellow in the Comparative Biomedical Scientist Training Program.

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Tessa Lutterman, B.Sc.

Lab Technician

Education:

B.Sc., Allegheny College, PA

Languages Spoken: German

Tessa is interested in the neuropathogenesis of Nipah virus. She is involved with research focused on Nipah virus model development.

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Johan A. Ortiz-Morales, B.S.

Postbaccalaureate IRTA Fellow

Education:

B.S., Universidad Ana G Mendez, Carolina, Puerto Rico

Languages Spoken: Spanish

Johan is interested in learning about microorganisms. During his time at RML, he will be working with virus-host interactions and respiratory tract organoids.

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Gayatri Subramanian, Ph.D.

Research Fellow

Education:

Ph.D., University of Toledo, OH

Languages Spoken: Hindi, Tamil

Gayatri is currently developing a drug-screening model for emerging respiratory viruses using SARS-CoV-2 and Influenza A viruses and targeting the Golgi, a critical site for viral replication and innate immunity.

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Brandi Williamson, M.P.H.

Microbiologist

Education:

M.P.H., University of California, Berkeley

Languages Spoken: German

Brandi has studied multiple organisms and vectors throughout her career, including Borrelia hermsii, Ornithodoros hermsi, Colorado Tick fever virus, Dermacentor andersoni, orthobunyaviruses, and hantaviruses. Her work has included next-generation sequencing, animal studies, field work, and molecular biology techniques. Currently in MPS, she aids the research of Nipah, SARS-CoV-2, and influenza viruses.

Learn more about Brandi Williamson, M.P.H.

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Christopher Winski, Ph.D.

Postdoctoral IRTA Fellow

Education:

Ph.D., University of Notre Dame, South Bend, IN
B.S., University of the Incarnate Word, San Antonio, TX

Chris is interested in understanding the pathogenesis of Nipah virus. Specifically, he uses cerebral organoids and in vivo models to study the establishment and progression of disease in the neurological setting.

Learn more about Christopher Winski, Ph.D.

Photo of Christopher Winski.

Former Research Group Members

Katherine Kaul, Postbac IRTA

Lizzette Pérez-Pérez, Postbac IRTA

Beniah Brumbaugh, Postbac IRTA

Reinaldo Mercado-Hernandez, Postbac IRTA

Manmeet Singh, PhD, Postdoc IRTA

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