@roger,
Wow. Interesting, Roger. I had almost the exact opposite.
My father had TB back in the days when folks were admitted to a TB sanitarium where they could hack all over each other and get well. Our family were all given bi-annual chest x-rays (mine occurred from the time I was 5 until I was 20). We had an arrangement with our family Dr that we wouldn't hear anything unless there was something to hear -- no news is good news. We all had scarring and positive TB tests because we'd lived in close quarters with someone with active TB. We were told that we'd successfully "encapsulated" the bacterium, formed antibodies, had a very slim chance of getting TB, but that there was a chance that the TB could become active, hence the bi-annual x-rays.
One time (I was in 2nd grade) we got a card in the mail to contact the dr regarding my chest x-ray. I absolutely freaked and was convinced that I was going to be marched off to the TB sanitarium. My mother called the dr and was told that my lungs look fine, but that the x-ray had identified a broken rib. I'd been bitching for months that my side hurt after sliding into a desk at school the previous school year.
To passing by... yes, do get yourself checked out. It could be TB, it could be viral, it could be any number of things, but it's worth getting checked and hopefully cured.