The coronavirus SARS-CoV-2 has fundamentally changed our lives within a short period. The world is in a state of emergency and there is no end in sight. The pandemic triggered by the coronavirus is a dynamic event shaped by many different factors, in particular human behaviour (e.g. hygiene behaviour and social interactions), making it highly variable. In many countries, the number of infections is rising exponentially. In the absence of effective therapeutic drugs or a vaccine, the number of infections can only be reduced by adopting far-reaching measures to restrict direct social contact ("physical distancing").