As hospital epidemiologist, dr Tostmann is responsible for the surveillance and outbreak detection of Healthcare associated infections in Radboudumc; together with the Hygiene and Infection Control Unit team which consists of a clinical microbiologist and infection prevention experts. Her research and teaching interests include global public health, infectious disease prevention and outbreak detection and control. She is the regional epidemiologist for the regional antimicrobial and infection prevention network GAIN and is appointed as one the Regional Epidemiologists by the Dutch Institute for Public Health and the Environment (RIVM). She teaches in the European training program for field epidemiologists (with ECDC). Her international activities include a consultancy for RIVM on infection prevention on the Dutch Caribbean islands, as well as international research on antimicrobial resistance.