Advantages of the Interferon- Gamma Release Assay (IGRA) Over the Traditional

Advantages of the interferon- gamma release assay (IGRA) over the traditional TB skin test include all of the following except

A) IGRA can be used on persons who have been vaccinated against TB.
B) IGRAs are sensitive enough to detect early cases of TB.
C) IGRA only detects active TB infections.
D) IGRA can provide results within a day.
E) IGRA requires only one patient visit as opposed to two with the skin test.