15 million Covid vaccine doses thrown away in the U.S. since March, new data shows

Pharmacies and state governments in the United States have thrown away at least 15.1 million doses of Covid-19 vaccines since March 1, according to government data obtained by NBC News — a far larger number than previously known and still probably an undercount.

Four national pharmacy chains reported more than 1 million wasted doses each, according to data released Tuesday by the Centers for Disease Control and Prevention in response to a public records request. Walgreens reported the most waste of any pharmacy, state or other vaccine provider, with nearly 2.6 million wasted doses. CVS reported 2.3 million wasted doses, while Walmart reported 1.6 million and Rite Aid reported 1.1 million.

The data released by the CDC is self-reported by pharmacies, states and other vaccine providers. It is not comprehensive — missing some states and federal providers — and it does not include the reason doses had to be thrown away. In one example of missing data, the CDC lists just 12 wasted doses for Michigan since March, but Michigan's Department of Health and Human Services said on Wednesday that the state has thrown away 257,673 doses since December.

The number of discarded doses is still a small fraction of the total vaccines administered in the U.S.