it depends on, is the person in active stage tb? are they coughing a lot? are you very close to them and what is your immune status? you get a tb test and then afterwards talk to the doctor if you need prophylactic antibiotics. it can be six months to nine months worth of antibiotics. jenna: i had no idea. this tuberculosis vaccination is one fairly common when we re young or used to be. the bc gvax seen. but we don t jenna: also, doctor, now that it is, you know, been years since we had that, do we need a booster? is there anything we should consider proactively? no. we don t really, we haven t been giving it in the united states because we haven t needed it. once you get bcg, you can t test for tuberculosis anymore because a lot of times it is positive. it depend those individuals, how close they were.