Political polarization may affect attitudes towards vaccination. An analysis based on the European Social Survey data...

Political polarization may result in increased confirmation bias, strengthening of disinformation mechanisms or policy distortion. This raises the question whether it may influence the vaccination programmes. This study investigates the relationship between the level of political polarization and coronavirus disease 2019 vaccine behaviour and vaccine acceptance.

In our study, we use the Partisan Polarization Index (PPI). The PPI aims to measure the gap between satisfaction with the government expressed by supporters of the ruling parties and that expressed by supporters of the opposition parties. We use the data from the latest round of the European Social Service from 23 countries. The effect of the PPI on the variability of vaccination declarations and intent across countries was verified based on a linear regression model.

The linear regression score for 23 countries revealed a statistically significant relationship between the vaccination variable and the level of political polarization. The model explains the variability in the vaccination levels based on the PPI in a given country at 38.6%.

Political polarization can contribute to shaping negative attitudes towards vaccination through policy distortion, undermining the effectiveness of compliance against regulation, undermining trust in science and increasing the public's susceptibility to conspiracy theories.