Screening for tuberculosis infection prior to initiation of anti-TNF therapy.

Autoimmunity Reviews
A Lalvani, Kerry A Millington

Abstract

T-cell interferon-gamma release assays (IGRAs) are more specific and probably more sensitive than the tuberculin skin test (TST) for the diagnosis of latent tuberculosis infection (LTBI). Patients with immune-mediated inflammatory diseases (IMID) and suspected LTBI who are candidates for anti-TNF therapy are at a significant risk of TB reactivation yet are prone to false-negative TST results because they are already on immunosuppressive medications. The role of these new blood tests in this patient population is therefore of considerable interest but is currently unclear. The limited published evidence-base shows that agreement between IGRA and TST results is poor in patients with IMID compared to patients without IMID, due to lower proportions of TST-positive results in patients with IMID. Discordant TST-positive, IGRA-negative results are associated with prior BCG vaccination and discordant TST-negative, IGRA-positive results are associated with steroid therapy. Notably, positive IGRA results are more closely associated with the presence of risk factors for LTBI than TST. The percentage of indeterminate IGRAs can be up to 12%. IGRA results in patients already taking anti-TNF agents currently remain uninterpretable. Given the ...Continue Reading

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