So some math

As of today, there are 29M people with 1 shot

Based on daily vaccination rates, about 11M of those 29M are in window between 1st and 2nd shot

Leaving about 18M people who missed 2nd shot.
That's 10% of folks who started getting vaccinated

But....

— Ashish K. Jha, MD, MPH (@ashishkjha) June 17, 2021