So far the feedback is positive
The TST requires a perfect technique to be valid: a strictly placed intradermal injection at the first visit with the doctor and a second visit for reading the result to the skin which is not very easy, because it is evaluated according to the diameter of the cutaneous papule. Moreover, for a subject vaccinated by the BCG (and always immunized) the performance of the diagnosis is even less good.
IGRA is presently seen as an aid to reading the TST! But a consensus is underway to replace the TST, knowing that additionally it is a good candidate for the biological tracking of LTBI and confirmation of the active TB. Thus Cellestis can make it possible to rectify the limits of the TST and to support an effective policy of fighting against tuberculosis.
