effective. and also to train people, to teach patience about how if you're on a medication for tuberculosis, you better finish your course. otherwise, you're going to develop a multiple drug resistant strain. that's hugely a respiratory bacteria, and it spreads would s by coughing, by sneezing, not by touch. it's not the easiest thing to spread, but close contact can spread this. and it will be a problem in the united states unless we take care of it now. >> and you talked about finishing your medicine. that is true not only for due better kilo sis, but if all of a sudden your doc gives you an anti-by on the tick for your sinus infection or stomach infection, anything, if you don't finish that full course of meds, that bacteria will become resistant to you. >> yes. and first of all, do you really need the antibiotic or is it a