By the numbers: The Centers for Disease Control and Prevention (CDC) reported 182,874 wasted doses as of late March, per KHN. CVS accounted for nearly half of the doses, while Walgreens was responsible for 21% — nearly 128,500 wasted shots altogether. Pfizer made up nearly 60% of wasted doses. The other side: Walgreens did not immediately return Axios' request for comment, but CVS spokesperson Mike DeAngelis said in an emailed statement the waste is a product of "transportation restrictions, limitations on redirecting unused doses, and other factors."