In 2005, we had our first, almost experimental, meeting, initiated by the four participating bodies: the EORTC Infectious Diseases Group, the EBMT Infectious Diseases Working Party, the Supportive Care Group of the ELN, and the Immunocompromised Host Society. Nineteen years later, ECIL has matured, and has earned its place as an authority in advising how best to deal with infectious complications of immunocompromised patients. ECIL has also come of age and is now a non-for profit organization thereby securing its future and safeguarding its autonomy.

ECIL has always sought to include the widest range of specialists in Infectious diseases of the immunocompromised patients be they clinicians, microbiologists, oncologists, haematologists to help define new areas of research. Since its inception, ECIL has published 34 articles in peer reviewed journals and 35 slide sets on a variety of infectious disease topics with the main ones being regularly updated. Thanks to their expertise, we have been able to create, debate, and issue guidelines for the wider community.

For the 2026 edition, we have chosen to address four topics:

- Update on vaccination strategies (HCT and CAR-T) 
- Antibacterial prophylaxis  
- CAR-T and bispecifics (infection risk, fever management, viral complications) 
- Update on EBV  

These sessions will be held in Mercure Sophia Antipolis (France) on September 17-19, 2026. Participation in ECIL 11 is only by invitation by the Organizer Committee, as it has been done from the beginning.

We gratefully acknowledge the support of our sponsors and wish to thank them for their contributions throughout the years.

Best wishes
The ECIL 11 Organization Committee