I’m a physician training in internal medicine and translational researcher in immunology and infectious diseases.

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I started my specialization in internal medicine in February 2020 at the Canisius Wilhelmina Hospital in Nijmegen, The Netherlands. I am specifically interested in infectious diseases and critical care, and currently completing my fellowship in Intensive Care medicine.

Besides clinical work I conduct research in immunology and infectious diseases. I am fascinated by how the cells of our own immune system can be optimized to fight off infection, which was the focus of my PhD research on malaria vaccines. I am currently also involved in multi-center studies on lung pathology and coagulopathy in Covid-19.

Beyond work I am an obsessive scuba diver, both right here in The Netherlands and abroad, and I teach CPR and First Aid to divers and medical interns.

A silly 3-min video about my PhD research

CV in short

CURRENT OCCUPATION

Fellow internal medicine-intensive care, Radboud university medical center, Nijmegen

PhD POSITION | 2014 - 2018

Center for Clinical Malaria Studies, Department of Medical Microbiology, Radboud university medical center, Nijmegen

EDUCATION

MSc, Selective Utrecht Medical Master (SUMMA), University Utrecht

BSc, University College Utrecht, University Utrecht

 

Key publications

Vitamin K2 Supplementation in Hospitalised COVID-19 Patients: A Randomised Controlled Trial

M.J.P. Visser, A.S.M. Dofferhoff, … and J. Walk

Journal of Clinical Medicine, 2024

Reduced Vitamin K Status as A Potentially Modifiable Prognostic Risk Factor in COVID-19

A.S.M. Dofferhoff, … J. Walk* and R. Janssen*

Clinical Infectious Diseases, 2020

A Double-Blind, Placebo-Controlled Phase 1/2a Trial of the Genetically Attenuated Malaria Vaccine PfSPZ-GA1

M. Roestenberg* and J. Walk* et al.

Science Translational Medicine, 2020

Outcomes of Controlled Human Malaria Infection After BCG Vaccination

J. Walk and L.C.J. de Bree et. al

Nature Communications, 2019

Can Patrolling Liver-Resident T Cells Control Human Malaria Parasite Development?

J. Walk, J. E. Stok and R.W. Sauerwein, 2019

Trends in Immunology, 2019

Stories about our research

Key opinion pieces