Ten who did not receive such therapy (median IGRA value, 0.42 IU/mL; range 0.35–10 IU/mL) repeated the IGRA test 1 to 6 months later, and 8 of them had negative results.

The World Health Organization (WHO) recognises the test as the “only” enzyme-linked immunospot (ELISPOT)-based interferon-gamma release assay (IGRA), notable for its cell number ...