I understand that tuberculosis, once treatment has begun, becomes vanishingly contagious. Only two forms of it are contagious. It is spread in sputum, not in the air, to my understanding. I'm not a medical doctor, and am just going off of medical literature I've read, so this information could be wrong. Simple preventative measures such as coughing into one's hand (and then washing it) or coughing into a kleenex or handkerchief helps prevent its spread.
What I do not know, however, is the relative degree of contagiousness between SARS and tuburculosis. Without that bit of information, any attempt to compare the two is pointless.
My last comment in my last post merely refers to the fact that I have said nothing here concerning whether I believe present public health measures to control SARS are adequate, insufficient or overboard, let alone have advocated more stringent measures.