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Description: Research suggests that epidemics and corresponding containment measures have negative consequences to the individual and cause stress. The psychological mechanisms that determine stress, caused by the COVID-19 pandemic and containment measures, are not yet clear. In a survey during the lockdown in Switzerland (n=1565), we found substantially increased levels of stress in the population. In particular, individuals who did not agree with the containment measures, as well as those who saw nothing positive in the crisis, experienced even higher levels of stress. In contrast, individuals who are part of a risk group or who are working in healthcare or in essential shops experience similar stress levels as the general public. We conducted a path analysis to gain a deeper understanding of the psychological mechanisms during lockdown. Experiencing fear of the disease is a key driver for being worried. Our model further shows that worries about the individual, social, and economic consequences of the crisis, strongly boost stress. The infection rate in the canton (i.e. state) of residence also contributes to stress. Positive thinking and perceived social, organizational, and governmental support mitigate worries and stress. To prevent stress, authorities should explain containment measures well, highlight positive aspects of the crisis, address worries, and facilitate support.