cappie ferrer has been going nonstop. >> we're holding these clinics monday through friday 7:00 a.m.o 7:00 p.m. >> an infectious disease expert at children's national hospital in washington, d.c. ferrer is leading the charge to vaccinate all staff who work at the medical facility. >> you better go on and poke me and get it over with. >> that's more than 8,000 people. and ferrer says most have gotten their first shot. but not all. >> 1500 straight out said no, i'm not getting that vaccine. >> what were the reasons? >> i would say -- a lot of it was because they were being cautious in terms of they were like, this is the first time. i'm not going to be the guinea pig. other folks had misinformation. there's covid in that vaccine. that's going to change your d.n.a. >> among the skeptical, nurse quitra williams. >> there's no way there's a vaccine for covid 9 this quickly. >> williams warned her family against it. >> they looked for it for my professional opinion. and at the time i said absolutely not. no one gets this vaccine, i mean, no one. >> i was leery because it seems like they we