FILE - In this Jan. 15, 2021, file photo, Dr. Yomaris Pena, Internal Medicine Physician with Somos Community Care at a COVID-19 extracts the last bit of Pfizer-BioNTech COVID-19 Vaccine out of a vial so as not to waste it at a vaccination site at the Corsi Houses in the East Harlem neighborhood of New York. An increasing number of COVID-19 vaccination sites around the U.S. are canceling appointments because of vaccine shortages in a rollout so rife with confusion and unexplained bottlenecks. (AP Photo/Mary Altaffer, File)
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