First Dose First and approving more vaccines are the easiest answer to this question. The prioritization is not working well, for the reasons outlined in this article.<p>However, we can give approximately 4x the rate of people getting 100% protection from ICU/death.<p>First dose first gives you approximately 2x the throughput (all first doses from all vaccine candidates thus far are fully protective from death).<p>Approving Astrazeneca, J&J, and Novavax today would give you a group of vaccines that don't rely on cold storage, so can be run through different distribution channels.<p>At 4x the rate, these prioritization concerns are much less important.<p>The US is flatlining in its number of doses administered, which means that by prioritizing 2nd doses, we will start to vaccinate very few new people soon (choosing instead to administer 2nd doses). We can see a looming shutdown of any progress towards herd immunity, and urgent action is needed.