Nearly 2.2 million vaccine doses were reported administered for a 24-hour period ended Thursday, CDC data shows.

Vaccinations peaked at around 3.4 million per day, according to a seven-day average, in April after the shots first became available.

Vaccinations were on the rise again heading into Thanksgiving and crossed the 1.5 million average shots per day mark in mid-November, many of which have been booster doses.