Poll: Nearly half of vaccine-hesitant Americans worried about side effects By (0) Among those who are hesitant to get a COVID-19 vaccine, there are commonalities around occupation and concerns of safety, according to a new survey. File Photo by John Angelillo/UPI | License Photo U.S. resistance to getting a COVID-19 vaccine is slowly diminishing, a new online survey finds, but it still exists and at especially high rates in some blue-collar jobs -- and nearly half of respondents are worried about side effects. For adults under age 65 who are hesitant, reluctance is mainly driven by concerns about safety, side effects and distrust in government, the poll found. It's also largely linked to people's line of work.