A corollary to the cautionary tale.
Sir,

The cautionary tale of the negative enzyme-linked immunospot assay test in a patient with non-tuberculous mycobacterial (NTM) disease1 has, as its corollary, the observation, made on the basis of a recent meta analysis, that ‘Although the diagnostic sensitivities of both IGRAs (interferon gamma release assays, namely, QuantiFERON-TB and T-SPOT.TB) was higher than that of the tuberculin skin test, it was still not high enough to use as a rule out test for …