This open access book addresses communicative aspects of the current COVID19 pandemic as well as the epidemic of misinformation from the perspective of argumentation theory. Argumentation theory is uniquely placed to understand and account for the challenges of public reason as expressed through argumentative discourse. The book thus focuses on the extent to which the forms norms and functions of public argumentation have changed in the face of the COVID19 pandemic. This question is investigated along the three main research lines of the COST Action project CA 17132 European network for Argumentation and Public PoLicY analysis APPLY descriptive normative and prescriptive. ampampnbsp The volume offers a broad range of contributions which treat argumentative phenomena that are directly related to the changes in public discourse in the wake of the outburst of COVID19. The volume additionally places particular emphasis on expert argumentation given i the importance expert discourse has had over the last two years and ii the challenges that expert argumentation has faced in the public sphere as a result of scientific uncertainty and widespread misinformation. Contributions are divided into three groups which i examine various features and aspects of public and institutional discourse about the COVID19 pandemic ii scrutinize the way health policies have been discussed debated attacked and defended in the public sphere and iii consider a range of proposals meant to improve the quality of public discourse and public deliberation in particular in such a way that concrete proposals for argumentative literacy will be brought to light. Overall this volume constitutes a timely inquiry into all things argumentative in pandemic discourse. This volume is of interest to a broad readership including philosophers linguists communication and legal scholars and members of the wider public who seek to better understand the discourse surrounding communicative phenomena in times of crisis.