The interplay between partisanship, risk perception, and mental distress during the early stages of the COVID-19 pandemic in the United States.

COVID-19 is a profoundly partisan issue in the U.S., with increasing polarization of the Republicans' and Democrats' responses to the COVID-19 pandemic and their precautionary actions to reduce virus transmission. Nevertheless, it remains unclear whether and how partisan gaps in many aspects of the pandemic are linked to mental health, which has increasingly been a major concern. This study examined the association between political partisanship and mental health by assessing the mediating and moderating relationships between risk perception, expected infection severity of COVID-19, and partisanship in terms of mental health during the early stages of the pandemic. The data were drawn from a cross-sectional web survey conducted between March 20 and 30, 2020, with a sample of U.S. adults (N = 4,327). Of those participants, 38.9% and 29.6% were Democrats and Republicans, respectively. The results indicate that Democrats were more likely to experience COVID-induced mental distress than Republicans, and higher risk perception and expected infection severity were associated with mental distress. Furthermore, risk perception and expected infection severity of COVID-19 mediated approximately 24%-34% of the associations between political partisanship and mental distress. Finally, the adverse mental health impact of risk perception and expected infection severity appeared to be much stronger for Republicans than Democrats. The findings suggest that political partisanship is a key factor to understanding mental health consequences of the COVID-19 outbreak in the U.S.