Before revision: We  employ a spin S = 1/2 Ising-like model and a  Fermi-Dirac-like function to describe the spread of Covid-19.
After revision: We revisit well-established concepts of epidemiology, the Ising-model, and percolation theory. Also, we employ a spin S = 1/2 Ising-like model and a Fermi-Dirac-like function to describe the spread of Covid-19.