Application of T-SPOT.TB in the Diagnosis of Cutaneous Mycobacterium marinum Infections and Evaluation of Treatment Efficacy
DOI:
https://doi.org/10.2340/actadv.v105.44119Keywords:
T-SPOT.TB, cutaneous Mycobacterium marinum infections, diagnostic valueAbstract
This study evaluated the diagnostic value and therapeutic efficacy assessment potential of the interferon-γ release assay T-SPOT.TB in cutaneous Mycobacterium marinum infections. A total of 145 patients diagnosed at the Institute of Dermatology, Chinese Academy of Medical Sciences (2020–2024), excluding tuberculosis cases, were retrospectively analysed. Clinical data including demographics, underlying diseases, pathology, microbiological culture, molecular identification, T-SPOT.TB results, treatment regimens, and outcomes were collected. T-SPOT.TB results before treatment, and at 3 and 6 months post-treatment, were compared to assess its diagnostic and monitoring utility. The baseline T-SPOT.TB positivity rate was 71% (95% CI: 63.2–77.8%). Among 17 patients retested at 3 months, positivity was 64.7% (p = 0.125), with median spot-forming cells (SFCs) significantly decreasing from 20.0 (IQR 8.5–41.0) to 8.0 (IQR 2.5–28.0) (p = 0.0007). Among 27 patients retested at 6 months, positivity was 59.3% (p = 0.344), with median SFCs decreasing from 12.0 (IQR 5.0–30.0) to 8.0 (IQR 3.0–13.0) (p = 0.0006). No significant difference in positivity rates was observed between 3 and 6 months post-treatment. The T-SPOT.TB assay shows significant diagnostic value for cutaneous M. marinum infections and facilitates early diagnosis. Declining SFC counts post-treatment provide useful reference for evaluating therapeutic response.
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