Sepsis remains one of medicine’s most intractable and costly problems, arising when an infection triggers a runaway immune response that damages organs long after a pathogen is controlled. It accounts for an estimated $53 billion in Medicare spending alone, yet more than a hundred drug trials have failed to yield a single approved drug that directly treats the underlying immune dysfunction. Inflam­matix, which grew out of work at Stanford University, has developed a point-of-care blood test to determine whether an infection is bacterial or viral, as well as the severity of the patient’s immune response to optimize treatment. We spoke to Tim Sweeney, CEO of Inflammatix, about the company’s TriVerity test for sepsis, how it works, and how it is used in an ER setting to determine who needs antibiotics, ICU‑level care, or a broader diagnostic workup.​