Shell - I have latent TB and I've done some reading on the CDC website among other sites. From what I've read it normally takes a significant amount of exposure (8-12 hours) to become infected, but it depends on how infective the person was.
I also tried to determine who/where I was infected. It is likely from a plane ride to & from Germany in 2005 or from a creepy dude who sat beside me on the DC metro years ago and whom I spoke with for about 5-10 mins.
Do you have active TB or are you latent? Are you taking meds? Any neg side effects?
I am 40 years old and am debating as to whether I should take INH. My last test measured 9mm so I am borderline positive. One doc tells me not to take INH but another recommends it. I am afraid of taking the meds but I know it is a gamble.
I have children and don't want to risk infecting them so I will probably go on the INH. I wish there were better meds available but they are 3-5 years out.
Good luck.