. >> nawaz: nakisha quarles works in patient registration at childrens' hospital. today, she's getting her second shot. >> i watched a couple colleagues for like 30 days just to see if they had any reactions or side effects that i should be aware of and i was and i was encouraged to get it, so i did. >> nawaz: christine brown works security at childrens. a covid survivor, she also had early doubts, and waited. >> i heard like different stories, like some of them say, you know, a lot of people say, well, the shot gave them headaches. they were just mainly talking about the side effects of it. >> nawaz: after a few weeks of consideration, brown opted for the shot. today, she says it gives her a sense of peace. for dudley and ferrer, earning the trust of their colleagues is the necessary, first step to wider acceptance. >> one of the reasons why the c.d.c. decided to vaccinate health care workers first was because typically health care workers are seen as trusted members of the community. we made a very concerted effort to ensure that our vaccination rates could get a