Time to Antibiotics and Mortality in Immunocompromised versus Non-Immunocompromised Patients with Suspected Sepsis

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ID: 321058
2026
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Ranked #237 of 532 articles by views in Clinical infectious diseases : an official publication of the Infectious Diseases Society of America

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Abstract
Abstract Background Timely antibiotics are key determinants of sepsis survival and are presumed to be especially critical in immunocompromised patients. However, evidence supporting this assumption is limited. Methods We identified all adults treated for suspected sepsis in the emergency departments of nine U.S. hospitals, 2015-2024. We identified immunocompromised patients using diagnosis codes, supplemented with clinical data to define a severely immunocompromised subgroup. We used multivariable logistic regression to assess associations between time-to-antibiotics (primary analysis: 1-3 vs 0-1h; secondary analysis: 3-6 vs 0-3h) and in-hospital mortality, stratified by immune status and sepsis severity. Results Among 39,842 hospitalizations with suspected sepsis, 20,721 occurred in non-immunocompromised patients and 19,121 in immunocompromised (2,283 severe). Overall, antibiotic administration at 1-3 vs 0-1h was associated with increased mortality in non-immunocompromised (OR 1.33, 95% CI 1.12-1.59) but not immunocompromised patients (OR 1.08, 95% CI 0.94-1.25). Increased risk was limited to septic shock, where delayed antibiotics were associated with higher mortality in both non-immunocompromised (OR 1.41, 95% CI 1.12–1.76) and immunocompromised patients (OR 1.21, 95% CI 1.002-1.47). In contrast, no association was observed in sepsis without shock regardless of immune status, including for antibiotic administrations at 3-6 vs 0-3h. Effect estimates were similar for mild-moderate and severe immunocompromise. Conclusions Short delays in antibiotic administration were associated with increased mortality in septic shock but not in sepsis without shock, with no evidence of greater vulnerability among immunocompromised patients. These findings suggest antibiotic urgency should be guided primarily by clinical severity rather than immune competence.
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Authors Simran Gupta, Michael Klompas, Caroline S McKenna, Anna A. Agan, Laura DelloStritto, Andre C Kalil, Chanu Rhee
Journal Clinical infectious diseases : an official publication of the Infectious Diseases Society of America
Year 2026
DOI
10.1093/cid/ciag401
URL
https://doi.org/10.1093/cid/ciag401
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