Proceedings of the National Academy of Sciences of the United States of America, 118(39), 1. National Academy of Sciences Diekmann, O, Othmer, H G, Planqué, R & Bootsma, M C J 2021, ' The discrete-time Kermack-McKendrick model : A versatile and computationally attractive framework for modeling epidemics ', Proceedings of the National Academy of Sciences of the United States of America, vol. 118, no. 39, e2106332118, pp. 1-9 . https://doi.org/10.1073/pnas.2106332118 Proc Natl Acad Sci U S A Proceedings of the National Academy of Sciences of the United States of America, 118(39):e2106332118, 1-9. National Acad Sciences