https://achrilock-atmospheric.tumblr.com/post/623522171873017856/covid-19-may-also-be-much-worse-the-second-time Here’s a link for the article, because the tumblr post embed is being weird. https://www.vox.com/2020/7/12/21321653/getting-covid-19-twice-reinfection-antibody-herd-immunity