FILE - In this Feb. 12, 2021, file photo, scripps health official draws from a vile of the COVID-19 vaccine prior to administering it at their new drive-thru vaccination site at the Del Mar Fairgrounds in Del Mar, Calif. Executives from the major COVID-19 vaccine producers are set Tuesday, Feb. 23, to answer questions from Congress about expanding the supply of shots needed to curb the pandemic that has killed more than 500,000 Americans. (Nelvin C. Cepeda/The San Diego Union-Tribune via AP, Pool, File)
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