dr. mark seigel. doctor, great to have you here. i have to ask you about the serum. it's been tested and seemed like it's working. >> the ebola virus shuts down our immune system. we don't make an antibody response ourselves. that is why the virus parades around our body, shutting down our organs they put the virus into mice and got it to make antibodies. they took those and have been giving them to monkeys and monkeys have recovered. this is the first time they ever have given the treatment to a human being. it's dramatic. we don't know yet. it's too early to say whether this is going to work or not but the way he walked into the hospital so far, so good with this. >> i know the fda wants to know why a lull when there is a urgent need arc lou something to be used that hasn't been fully tested there are families that ask for it but it seems like this is an urgent case. the agency was moved to let this happen. >> i'm in agreement with this. dr. brantly was over there caring for people. i think we owe to him to do the best we can. plus, we're doing this under circumsta