sage myers runs vaccinations for the children's hospital of philadelphia, a partner of this event. >> teenagers like everyone else have seen all the sort of memes that have gone on and the videos. sometimes they're just a little afraid in general of getting a shot. that's one of the reasons the ambassadors have been amazing and just having a peer with them as really made a huge difference. >> reporter: every single day public health officials are on tv. does that have any impact on teens, you think? >> no, because some teens follow after their parents, and their parents think that the system doesn't always work. and that their testing -- unless it's a teen on there that's talking about the vaccine, i don't think it's helping. >> reporter: you guys are going to tell me what's the name of the girl that sings the driver's license song? >> olivia rodriguez. >> reporter: her going to the white house and talking about the vaccine have an impact? >> yes. >> reporter: yeah? >> it's important to have conversations with friends and family members encouraging all communities to get vaccinated. >