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#4-47E. Unmasking Hidden Immunodeficiency: Interpreting IGRA Discrepancies (NEJM, 2026)
2026年5月20日 05:00·4分47秒
When encountering an opportunistic infection like disseminated Mycobacterium abscessus in a seemingly immunocompetent patient, what underlying vulnerabilities should we suspect? This case report details a 62-year-old man presenting with malaise, rash, and diffuse lymphadenopathy. After isolating M. abscessus, a striking discrepancy between the positive controls of two different interferon-gamma release assays (IGRAs)—QuantiFERON and T-SPOT—led to the definitive diagnosis of anti-interferon-gamma autoantibody syndrome. The most crucial clinical takeaway is that such IGRA discordance serves as a pivotal clue for detecting neutralizing autoantibodies and hidden immunodeficiencies. Additionally, clinical worsening during appropriate antimicrobial therapy was identified as a paradoxical reaction rather than a true treatment failure. While this offers profound clinical insights, we must critically appraise that this is a single case report, which inherently limits its broad generalizability to all patient populations. For attending physicians, recognizing this unique IGRA pattern is vital for uncovering acquired immune defects, and accurately distinguishing paradoxical inflammatory reactions from true therapeutic failures ensures optimal patient management without unnecessarily altering effective antibiotic regimens.
Citation: Matsumura M, Kanda N, Hatakeyama S, Dhaliwal G. Immune Interference. The New England Journal of Medicine. 2026. DOI: 10.1056/NEJMcps2511351
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