First off hope that is correct.Based on 59.5 million vaccines administered and 28 million documented covid cases would think a decent percentage of people still susceptible. The wildcard is how many undocumented mild or asymptomatic cases are there?2x,4x,5x the number of known cases? Also there's overlap between people vaccinated but also already having had covid lowering totals. Hard to gauge what the real percentage of susceptible population still exists. Also some of the recent sharp declines in new cases have weather related closures of testing sites playing a role.