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Background
T‐cell Xtend (TCX) was introduced to extend the blood storage time for T‐SPOT.TB test, a widely used commercial interferon gamma release assay (IGRA) for rapid in vitro tuberculosis.
Methods
A total of 99 Uyghur suspected tuberculosis patients were recruited in this study. T‐SPOT.TB test was performed with fresh blood (controls), 36 hours delayed blood and delayed and TCX‐treated (at...