This distortion is almost insignificant in adults aged >30 years, irrespective of the age at vaccination or revaccination. 15 TST may also be negative in patients who have been taking corticosteroids for >1 month or thiopurines or methotrexate for >3 months.
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Asian Organization for Crohn's and Colitis and Asia Pacific Association of Gastroenterology consensus on tuberculosis infection in patients with inflammatory bowel disease receiving anti-tumor necrosis factor treatment. Part 1: risk assessment.
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