CIRCLE
Critical Illness Immunological Reprogramming and Control Point Learning Engine
What if we could harness the immune system using AI for faster and better critical care?
The Problem
- More than 7 million Americans are treated in the intensive care units (ICU) of hospitals each year. Many are critically ill with infections, severe injuries, complications of chronic disease, and other factors that elicit a response from the body’s immune system. The body’s immune response is pivotal in fighting disease; however, when immune and inflammatory responses go into overdrive, these normally beneficial mechanisms can lead to worse health outcomes, such as organ failure and death.
- Currently, clinicians lack the tools to accurately track the body’s rapidly changing immune response and therefore cannot intervene precisely or quickly enough to reduce inflammation before it damages organs.
- Today's critical care systems often miss opportunities to detect and treat these harmful changes in the immune system because inflammatory and immune responses are notoriously complex and because options to influence the immune system during critical illness are limited.
The Solution
- The Critical Illness Immunological Reprogramming and Control Point Learning Engine (CIRCLE) aims to develop new digital twin capabilities to treat critical illness using the latest in AI and diagnostics. This innovation will determine immune system control points that can enable better use of existing immunotherapies as well as next-generation interventions for critical care.
- CIRCLE seeks to unlock the ability to track and modulate the body’s immune response on a massive scale, giving clinicians AI-based tools for better diagnosis and care of critically ill patients.
Only ARPA-H can...
- Harness the power of American innovation to provide clinicians in the ICU with robust, data-driven tools to save more lives and improve the quality of life after critical illness.
- Leverage sophisticated immune system data collection combined with computational technologies to deliver actionable insights and to drive new therapies for life-saving critical care.
- Empower the best technical experts to unravel the complexity of the immune system and develop innovative strategies for critical care that could eventually also be used to treat a host of chronic inflammatory conditions beyond critical illness.
- Catalyze early integration of commercialization and clinical translation efforts to accelerate the transition of these innovations to intensivists and their critically ill patients.
Awardees
Meet the research and development teams selected to carry out the CIRCLE program.
Program Manager

"Our body’s immune system is one of the most powerful defenses against disease, but because it is extremely fast-moving, complex, and imperfect, it can paradoxically lead to critical illness, especially in individuals with chronic disease. CIRCLE seeks to unlock the ability to track and modulate the body’s immune response like never before and, in doing so, give clinicians the tools to prevent critical illness from claiming millions of lives.”