Well here's my slant on this whole TB scare.
My son tested positive on a routine TB test when he was in the 3rd grade, 7 years ago. Several tests later, X-rays, and visits to the pediatric infectious diseases dr., it was never determined where he contracted the TB. Now, his was never "active" so he was never contagious; but someone was. Everyone in the family was tested. We had no foreign nannies or housecleaners in our household; no close friends had Eastern European (major carriers today) nannies or third world employees that he could've been in close contact. But it had to have happened while he was in the 3rd grade because he was tested annually.
He had to take a daily dose of the government req'd meds. for 10 months, never missing a single dose. I was allowed to administer his meds at home; he didn't have to take them with a witness present at a TB clinic (which is extremely important for the homeless or drug addicts, otherwise, if they miss doses or just stop, there's where the drug resistance begins). He's fine now but he will always test positive for the remainder of his life.
Now here's what's so peculiar about this whole thing. We were called into a meeting by the head of the infectious diseases dept. & told by everyone on the staff that we must not tell anyone outside of our immediately family (that being the 3 of us) and not tell the elem. school. They said it would be all over the local media & cause unwarranted panic. They said it's unfortunate but that's the way people react today - - over react. So we followed the dr's orders. He probably contracted it on a plane or public transportation to Chicago, in an elevator, who knows. This is where it was explained to us how widespread it is & to cause a panic and undo stress would be futile. It can happen to anybody, anywhere, anytime. It really can never be tracked down to any one single carrier.
I would never have dreamed something like this could've happened. It's no wonder I'm a germaphobe. But it's a education in life. We're better educated now and are thankful.