In 2026, the Swiss 3Rs Day comes to Basel - the heart of Swiss biomedical research. This year, we focus on immunology and infectious disease, two fields where scientific progress is urgently needed and where new approaches can significantly advance the Replacement, Reduction and Refinement of animal use.

The event brings together researchers, animal welfare specialists, clinicians, policymakers, and 3Rs innovators to explore:

• Human-relevant models, from organoids to microphysiological systems, that help us understand immune responses and host–pathogen interactions

• Refined preclinical approaches that improve animal welfare while strengthening scientific outcomes

• Reduction strategies, including data sharing, advanced study design and new computational tools

• Progress in Replacement technologies, including in vitro and in silico models for vaccine and drug discovery

• The future of 3Rs implementation across Swiss universities, industry, and hospitals

The 3Rs Day 2026 will feature experts covering topics ranging from basic and applied research to industry applications, as well as opportunities to connect with colleagues driving change in Switzerland and beyond.

Check out the 3Rs Day 2026 Poster, and take a look at the current programme - updates forthcoming!