Before revision:  by conducting counterfactual analyses, we find that the U.S. public is most concerned about the safety, effectiveness, and political issues regarding potential vaccines for COVID-19 . In particular, we also investigate public opinion about the newly emerged mRNA vaccines and find opinions vary significantly across by religious beliefs with proportionally more religious people in the anti-vaccine group .
After revision:  by conducting counterfactual analyses, we find that the U.S. public is most concerned about the safety, effectiveness, and political issues regarding potential vaccines for COVID-19 , and improving personal pandemic experience increases the vaccine acceptance level .