Titers are measured before, after first jab and before second, so logistically this is pretty easy. The methods are described in the paper. It’s basically a cou

Titers are measured before, after first jab and before second, so logistically this is pretty easy. The methods are described in the paper. It’s basically a couple of blood draws and quite simple to get a cohort based on questionnaire given that there’s 20M confirmed cases in the US. This seems like an efficient study that could increase vaccination rate since people are more likely to get one dose rather than two. For many people, traveling to a vaccination appointment is a big deal. This also serves to help convince people who have had COVID the value in getting a vaccine.