The Behavioral Immune System and Vaccination Intentions During the Coronavirus Pandemic

The behavioral immune system is considered to be a psychological adaptation that decreases the risk of infection. Research suggests that, in the current environment, this system can produce attitudes with negative health consequences, such as increased vaccine hesitancy. In three studies, we investigated whether two facets of the behavioral immune system—contamination aversion (i.e., avoiding potential contamination) and perceived infectability (i.e., perceived susceptibility to disease)—predicted intentions to accept COVID-19, influenza, and measles or general childhood vaccinations. Both contamination aversion and perceived infectability were higher during than before the pandemic. In contrast to previous research, those with higher contamination aversion during the pandemic perceived vaccines to be safer and had higher intentions to accept vaccination. Contamination aversion before the pandemic was not associated with perceived vaccine safety or vaccination intentions during the pandemic. Individuals who perceived themselves as more susceptible to diseases were slightly more willing to accept vaccination. We conjecture that high disease threat reverses the relationship between the behavioral immune system response and vaccination. As the associations were weak, individual differences in contamination aversion and perceived infectability are of little practical relevance for vaccine uptake.