you know, my colleague megan murray is doing a trial looking at bcg vaccine, which is a tb vaccine thatlion kids every year. it kind of boosts your immune system and protects you from lung disease and other things. it could be that a nonspecific vaccine might help. to jump back to the uv light for a second, my colleague who's been doing this for 40 years has actually mapped out what would be needed for a walmart or a home depot or a target, and it's very, very doable to make some of these places safer. >> irwin, what's your take on it? >> well, my take is unfortunately there's a lot of unknowns here including let's start with the issue of the antibodies, and you know, the igg and the igm, two different types of antibodies. it's not yet certain that we're going to have efficient testing that will tell you that, yes, you have antibodies but the specific antibodies needed to fight the coronavirus. there's work that needed to be done. the other thing is with uv lighting and other things there's still some question at least in my mind because a big study came out of china a couple of days ag