“The researchers surveyed more than 6,000 people in the United States, United Kingdom, European Union, Australia, and New Zealand. They contacted them first in December 2020, to assess their intentions before the vaccines were widely available, and asked them to pick a number between 0 and 10 to represent their likelihood of getting vaccinated. Then they followed up in summer of 2021 to see how people actually behaved.
To me, their most interesting findings concerned the most ardent vaccine refusers. Six months later, one-third of the people who had rated themselves 0 in December had gotten vaccinated.
So what happened? What convinced them?
Some of it was circumstances. Among those who had put themselves between 0 and 3 on getting vaccinated, those who were older (and therefore at higher risk of serious illness) and concerned with their health risks were more likely to get vaccinated in spite of their skepticism. So did the people who anticipated indirect exposure to Covid-19 through their friends or relatives. People who consumed more traditional media and who had more trust in scientists were also more likely to come around.
Vaccine mandates were not in effect at the time of these surveys, but the study generally found a mixed response to compulsory vaccinations among the respondents.”
https://www.vox.com/coronavirus-covid19/2022/2/17/22938873/covid-19-vaccines-skeptics-messaging