https://www.selleckchem.com/CDK.html Mobile applications are increasingly regarded as important tools for an integrated strategy of infection containment in post-lockdown societies around the globe. This paper discusses a number of questions that should be addressed when assessing the ethical challenges of mobile applications for digital contact-tracing of COVID-19 Which safeguards should be designed in the technology? Who should access data? What is a legitimate role for "Big Tech" companies in the development and implementation of these systems? How should cultural and behavioural issues be accounted for in the design of these apps? Should use of these apps be compulsory? What does transparency and ethical oversight mean in this context? We demonstrate that responses to these questions are complex and contingent and argue that if digital contract-tracing is used, then it should be clear that this is on a trial basis and its use should be subject to independent monitoring and evaluation.To say that coronavirus is highly visible is a massive understatement in terms of its omnipresence in our lives and media coverage concerning it, yet also clearly untrue in terms of the virus itself. COVID-19 is our invisible enemy, changing our lives radically without ever revealing itself directly. In this paper I explore its invisibility and how it relates to and exposes other invisible enemies we are and have been fighting, in many cases without even realizing. First, I analyse the virus itself and how its stealthy nature has transformed our lives. Second, I describe how the invisible epidemic of social media sharing of fake news about the virus worsens the situation further. Third, I explore how the virus has revealed to us what really matters in our lives and has forced us to re-evaluate our priorities. Fourth, I go on to explore the underlying structural weaknesses and disparities in society that have been exposed by the virus but previously remained unconsidered for so long