dr. william sharpner, leading expert on infectious diseases.it is good to see you, to have you back with us and thank you for taking the time. >> my pleasure, lou. >> let's turn to this level one activation. your thoughts, your reaction to it? >> well, we were waiting for it and knew it was coming. this is an indication of the really serious commitment of the ckc all hands to address the ebola outbreak. the outbreak in africa principally, but also ramifications around the rest of the world. so people will be volunteering from all parts of the agency to work on this problem for the next several months, we think, focused on this problem. >> and, you know, as you say there are many listening to us discuss earning bowla. the higher level of arc letter on the part of the cdc and they're asking, thinking about the two americans who have rushed to this country, stricken with e bella and dr. brantly is improving because of the zmapp drug and nancy writebol, she is weak, but improving and is your outlook positive for them at this point? >> it's positive