There are millions of people , mostly from other countries, who have come into contact with
TB but are not active,
and when they get a
TB tine test, it can show a false positive
and therefore, you need the chest xray to confirm. For some reason a TB vaccine of some kind is given to children in foreign countries and the reaction to the tine test Positive(red and raised) here in the US is really just a reaction to that vaccine.