Nurse Melissa Valentin shows a dose of the Pfizer-BioNTech COVID-19 vaccine to be applied to medical personnel at the Ashford Presbyterian Community Hospital in San Juan, Puerto Rico, Tuesday, Dec. 15, 2020. After a first lot of vaccines arrived to the island the first in line to be inoculated are health workers, emergency responders, hospital employees and those who live or work in shelters or nursing homes. (AP Photo / Carlos Giusti)
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