Book excerpt: On 30 January 2020, in response to the globalisation of COVID-19, the World Health Organization declared a Public Health Emergency of International Concern. The deadly outbreak has caused unprecedented disruption to travel and trade and is raising pressing legal questions across all disciplines, which this book attempts to address.00The aims of this book are twofold. First, it is intended to serve as a "toolbox" for domestic and European judges. They will soon be dealing with the interpretation of COVID-19-related legislation and administrative measures, as well as the disruption the pandemic has caused to society and fundamental rights.00Second, it aims to assist businesses and citizens who wish to be informed about the implications of the virus in the existence, performance and enforcement of their contracts.