ArticleInfection2026
Clinical characteristics of bloodstream infections in the patients receiving anti-IL-6 receptor antibody.
Article in Infection, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Authors and funding
10 authors.
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Abstract
purposeAlthough indications for anti-interleukin 6 (IL-6) receptor antibody (anti-IL6R) therapy continue to expand, the clinical features of bloodstream infection (BSI) in anti-IL6R recipients remain poorly characterized. We investigated the prevalence, clinical and microbiological features of BSI among the anti-IL6R recipients.
methodsWe conducted a multicenter, retrospective study of BSI episodes occurring within 90 days of anti-IL6R administration between 2005 and 2024. Complicated BSI was defined as the presence of either (1) infection-related mortality, (2) remote or localized suppurative complications, (3) embolic stroke, or (4) recurrence within 90 days. Associations between clinical variables and complicated BSI were analyzed.
resultsAmong 922 anti-IL6R recipients, 47 patients (5%) developed BSI. Demographics varied by indication for anti-IL6R, and 89% received concomitant immunosuppressive therapy. Catheter-related bloodstream (23%) and intra-abdominal (21%) were most common foci, followed by bone and joint (14%). At presentation, fever was absent in 53%, and serum CRP was within normal range in 30%. Septic shock occurred in 26%, and all-cause 30-day mortality was 19%. Complicated BSI occurred in 22 episodes (47%). In univariate analysis, underlying rheumatic disease, community acquisition, onset within 21 days of anti-IL6R administration, and Staphylococcus aureus or Klebsiella pneumoniae etiology were associated with complicated BSI, whereas higher pulse rate at presentation and Pitt bacteremia score ≥ 4 were inversely associated.
conclusionsIn anti-IL6R recipients, BSI frequently lacked typical signs such as fever but often resulted in severe outcomes. Clinicians should maintain a high index of suspicion for complicated BSI in this population.
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