Attitudes towards COVID-19 vaccines may have “spilled over” to other, unrelated vaccines along party lines in the United States

This study used data from pre- and post-COVID surveys to examine vaccine attitudes in the United States. We found evidence consistent with an ideological “spillover” effect: Liberals’ attitudes became more positive towards non-COVID vaccines (flu, MMR, HPV, chickenpox) and conservatives’ attitudes became more negative. These spillover effects are perplexing because the COVID-19 vaccines were developed more rapidly than the others and (some of them) were the first to use mRNA technology on a mass scale to achieve immunization. Hence, there were reasons to isolate one’s attitudes towards the COVID-19 vaccines rather than generalize them. This exacerbates current vaccine communication challenges.