explosion of cases. a doubling or tripling of cases every seven days. it's accelerating greatest in 18 to 49 age group. >> reporter: back at the food truck festival jaclyn is 22. and says no vaccine for her. >> i just don't think i need it. >> you do know that almost everyone now dying or hospitalized is somebody who hasn't been vaccinated? the people that have been vaccinated aren't going to the hospital and not dying. does that concern you? >> i don't have any underlying health issues. i'm not concerned. >> i'll do the johnson & johnson. >> perfect. >> reporter: those that are concerned continue to the vaccination tent. jason said he wasn't going to come until this festival. how come you waited this long? >> based off stuff from the internet and people saying.