I’m still struggling with two aspects of the data on COVID. One is the risk of reinfection. I’ve had three shots and I’ve had COVID. And yet it does seem like people in that same boat are getting COVID again. How often? The second aspect is long COVID, discussed everywhere but something I’ve struggled to get my head around. Today I’m going to offer — and sorry in advance that this is so long — some data on both. The spoiler is that we do not have ideal evidence on either question so I’ll try to surface what we do have. Want more on pregnancy and parenting? Subscribe to the ParentData newsletter for free at emilyoster.substack.com. You can also become a paid subscriber for access to the full ParentData archive (searchable by topic) and an extra newsletter every week.