Grenfell et al. 2004 (https://t.co/1uq4qZvP2f) lays out the conceptual foundations for thinking about this problem. This figure is a bit hard to parse, but basically vaccination will increase population immunity and move rightward on the x-axis. 2/19 pic.twitter.com/L7odPQAPEH

— Trevor Bedford (@trvrb) November 22, 2021