Saad-Roy, Chadi, Bryan Grenfell, Simon Levin, P van den Driessche, and Ned Wingreen. (2021) 2021. “Evolution of an Asymptomatic First Stage of Infection in a Heterogeneous Population.”. Journal of the Royal Society, Interface 18 (179): 20210175. doi:10.1098/rsif.2021.0175.