app, application, cell phone, cellphone, contact tracking, containment, corona virus, corona warning app, coronavirus, covid-19, covid19, crisis, design, device, digital, display, epidemic, german, germany, hand, health, holding, illustrative editorial, infected, interface, internet, medical, mobile, official, online, pandemic, phone, prevention, privacy, privacy concerns, real, screen, security, smartphone, software, surveillance, technology, tracing, tracking, tracking app, virus, virus spread