This project utilizes data from an in-person public opinion research conducted in Hungary (March 2021, N=1000). Study 1 is an exploratory research aiming to identify the major determinants of vaccine hesitancy on the individual level by conducting a multi-variate analysis involving political, socio-economic and various cognitive, emotional and behavioral variables. Study 2 is a survey experiment testing several hypotheses and measuring to what extent vaccine hesitancy can be reduced by public health communication. The authors pre-registered the experiment analyzed in Study 2, beforehand they received data. Preregistration is available at: https://osf.io/athrc Originally, Study 1 and Study 2 were included in one manuscript. This manuscript was submitted to the the Journal of Behavioral Medicine. During the review process, it was advised that the the studies should be separated into two separate manuscript. A revised manuscript, presenting only Study 1 were published to the Journal of Behavioral Medicine. The published article is available at: https://doi.org/10.1007/s10865-022-00314-5 Study 2 is going to be included in a new project, which involves two new survey experiments aiming to increase vaccine uptake. The two new experiments were also pre-registered. These preregistrations are available at: https://osf.io/f5d24 and https://osf.io/s437c Further information about these new experiments: https://osf.io/muvd9/