Willingness to vaccinate among adults, and factors associated with vaccine acceptance of COVID-19 vaccines in a nationwide study in Poland between March 2021 and April 2022.

However, there was a decreasing trend in these concerns over the study period.

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Of note, studies in the US conducted between 2020–2021, and 2021–2022 indicate that it is possible to maintain an increasing trend in willingness to vaccinate, although in contrast to our study this analysis included both the vaccinated and planning to get vaccinated as willing to vaccinate ( 24 , 25 ).

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