The U.S. Vaccine Rollout

c. 100M doses have been given in the US

We need to combine those with resistance from the vaccine and those with resistance from infection to get to total proportion of population that is resistant to the virus

We have learned that one gets 80-90% of virus resistance from the first dose, and additional 5-10% resistance from the second dose. Therefore an optimal vaccine strategy going forward would be to give the first dose to entire population, then circle back through the population for the second dose.