["Sending a signal of solidarity via bluetooth?"-A medical ethical analysis of the public debate on the Corona-Warn-App].

Definition of the problem: In the public debate in Germany on the Corona-Warn-App, the concept of solidarity is a prominent, but contested normative reference point. Thus, different uses of the concept with heterogeneous assumptions, normative implications and practical consequences stand next to each other and require medical ethical investigation. Against this backdrop, this contribution aims firstly to illustrate the spectrum of understandings of the concept of solidarity in the public debate on the Corona-Warn-App. Secondly, it elaborates the preconditions and normative implications of these uses and evaluates them from an ethical perspective. Arguments: Starting with an introduction of the Corona-Warn-App and a general definition of the concept of solidarity, I present four examples for different uses of the concept of solidarity from the public discourse on the Corona-Warn-App that vary regarding the underlying identification, the group of solidarity, the solidarity contribution and the normative goal. They highlight the need for further ethical standards in order to assess their legitimacy. Hence, I use four normative criteria of a context-sensitive, morally substantial conception of solidarity (openness, malleable inclusivity, adequacy of the contribution, normative dependence) to ethically evaluate the solidarity recourses presented. Conclusion: Critical remarks can be formulated for all presented notions of solidarity. On the one hand, the potentials and limitations of solidarity recourses in public debates become apparent. On the other, criteria can be derived for a solidarity-promoting use of the Corona-Warn-App.