Commentator "grizzly1", who claims to be a HCW handling refugees on Christmas Island, has been discussing the relative merits of some TB tests and makes the following comment;
QFT requires overnight incubation then on the next flight to a central testing lab for analysis, for us that means a weeks wait, at least, for a result that just tells us that at some time this person has been exposed to TB
This statement is not correct; by only utilising effector T-cells QFT differentiates between existing and past infection. It is the skin test that reacts to both effector and memory T-cells making it
less accurate.
QFT is significantly more precise than TST in identifying people who will progress to active TB disease
These relatively simple misunderstandings all help to keep TB the #2 fatal infectious disease in the world.
