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Physician Joyce Limurti, 40, flexes her bicep as she is given the coronavirus disease (COVID-19) vaccine at Dignity Health Glendale Memorial Hospital and Health Center in Glendale, California, U.S., December 17, 2020. REUTERS/Lucy Nicholson
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A woman receives the Pfizer-BioNTech COVID-19 vaccine at a drive through vaccination centre amid the outbreak of the coronavirus disease (COVID-19) in Hyde, Britain, December 17, 2020. REUTERS/Phil Noble
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Kayla Johnson, a registered nurse at Boston Medical Center, prepares a coronavirus disease (COVID-19) vaccine for respiratory therapist Benjamin Fuertes at Boston Medical Center in Boston, Massachusetts, U.S., December 16, 2020. Erin Clark/Pool via REUTERS
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President and CEO of the Boston Medical Center Kate Walsh (C) applauds alongside other BMC employees after the first coronavirus disease (COVID-19) vaccine is administered to staff at Boston Medical Center in Boston, Massachusetts, U.S., December 16, 2020. Erin Clark/Pool via REUTERS
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A Saudi man gets a dose of a coronavirus disease (COVID-19) vaccine, in Riyadh, Saudi Arabia December 17, 2020. REUTERS/Ahmed Yosri
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A general view of a vaccination centre at the Festhalle as the coronavirus disease (COVID-19) outbreak continues in Frankfurt, Germany December 17, 2020. REUTERS/Ralph Orlowski?
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Fourth-year medical student Anna Roesler administers the Pfizer-BioNTech coronavirus disease (COVID-19) vaccine at Indiana University Health, Methodist Hospital in Indianapolis, Indiana, U.S., December 16, 2020. REUTERS/Bryan Woolston
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A man receives the Pfizer-BioNTech COVID-19 vaccine at a drive through vaccination centre amid the outbreak of the coronavirus disease (COVID-19) in Hyde, Britain, December 17, 2020. REUTERS/Phil Noble
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Physician Alister Martin receives one of the first doses of the Pfizer-BioNTech coronavirus disease (COVID-19) vaccine from RN Jennifer Lisciotti at Massachusetts General Hospital in Boston, Massachusetts, U.S., December 16, 2020. Craig F. Walker/Pool via REUTERS TPX IMAGES OF THE DAY
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Boxes containing the Moderna COVID-19 vaccine are prepared to be shipped at the McKesson distribution center in Olive Branch, Mississippi, U.S. December 20, 2020. Paul Sancya/Pool via REUTERS
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Mary Lou Galushko gives Jeanne Peters, 95, a rehab patient at The Reservoir, a nursing facility, the first coronavirus disease (COVID-19) vaccination at the nursing home, in West Hartford, Connecticut, U.S., December 18, 2020. Stephen Dunn/Pool via REUTERS
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Boxes containing the Moderna COVID-19 vaccine are prepared to be shipped at the McKesson distribution center in Olive Branch, Mississippi, U.S. December 20, 2020. Paul Sancya/Pool via REUTERS
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A soldier participates in a drill days before starting the vaccination process from the Pfizer-BioNTech COVID-19 vaccine, as the coronavirus disease (COVID-19) outbreak continues in Mexico City, Mexico December 18, 2020. REUTERS/Edgard Garrido
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Medical intensive care unit nurse Tor Hansen received one of the first doses of the Pfizer-BioNTech coronavirus disease (COVID-19) vaccine from RN Jennifer Lisciotti at Massachusetts General Hospital in Boston, Massachusetts, U.S., December 16, 2020. Craig F. Walker/Pool via REUTERS
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A Saudi woman gestures after she received the first dose of a coronavirus disease (COVID-19) vaccine, in Riyadh, Saudi Arabia December 17, 2020. REUTERS/Ahmed Yosri
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Nurse practitioner Hope Alfonso, 34, is given the coronavirus disease (COVID-19) vaccine at Dignity Health Glendale Memorial Hospital and Health Center in Glendale, California, U.S., December 17, 2020. REUTERS/Lucy Nicholson
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A healthcare worker draws the coronavirus disease (COVID-19) vaccine from a vial at Martin Luther King Jr. Community Hospital, in South Los Angeles, California, U.S., December 17, 2020. REUTERS/Lucy Nicholson
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Nurse practitioner Hope Alfonso, 34, is given the coronavirus disease (COVID-19) vaccine at Dignity Health Glendale Memorial Hospital and Health Center in Glendale, California, U.S., December 17, 2020. REUTERS/Lucy Nicholson
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Dr. Joshua Barocas, an infectious diseases physician at Boston Medical Center, pulls up his sleeve in preparation for a coronavirus disease (COVID-19) vaccine administered by RN Kayla Johnson (R), at Boston Medical Center in Boston, Massachusetts, U.S., December 16, 2020. Erin Clark/Pool via REUTERS
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Nurse Debelyn Leach receives the Pfizer-BioNTech coronavirus disease (COVID-19) vaccine at Brigham and Women's Hospital in Boston, Massachusetts, U.S., December 16, 2020. REUTERS/Brian Snyder
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Nurse Bertilla Sayers prepares a syringe with a dose of the Pfizer/BioNtech COVID-19 vaccine for Lionel Blair at an NHS vaccine centre that has been set up in the grounds of the horse racing course at Epsom in Surrey, Britain December 16, 2020. Steve Parsons/Pool via REUTERS
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A man receives the Pfizer-BioNTech COVID-19 vaccine at a drive through vaccination centre amid the outbreak of the coronavirus disease (COVID-19) in Hyde, Britain, December 17, 2020. REUTERS/Phil Noble
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Pharmacy manager Larren Suh prepares a dose of the Pfizer-BioNTech coronavirus disease (COVID-19) vaccine at Massachusetts General Hospital in Boston, Massachusetts, U.S., December 16, 2020. Craig F. Walker/Pool via REUTERS
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A refrigerated container with China's Sinovac vaccines against the coronavirus disease (COVID-19) arrives at Sao Paulo International Airport in Guarulhos, Brazil December 18, 2020. The banner reads "Brazil's vaccine". REUTERS/Amanda Perobelli
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A Saudi woman gestures after she received the first dose of a coronavirus disease (COVID-19) vaccine, in Riyadh, Saudi Arabia December 17, 2020. REUTERS/Ahmed Yosri
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FILE PHOTO: Personal support worker Johanne Lamesse reacts in anticipation to the needle as she receives the Pfizer-BioNTech COVID-19 vaccine at the Civic Hospital in Ottawa, Ontario, Canada December 15, 2020. Adrian Wyld/Pool via REUTERS TPX IMAGES OF THE DAY/File Photo
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Respiratory therapist Benjamin Fuertes (L) and Boston Medical Center Dr. Christopher Manasseh wait to receive a coronavirus disease (COVID-19) vaccine from RN Kayla Johnson at Boston Medical Center in Boston, Massachusetts, U.S., December 16, 2020. Erin Clark/Pool via REUTERS
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Karima Chrichem, who works in Environmental Services at Boston Medical Center, receives a coronavirus disease (COVID-19) vaccine administered by LPN Eunide Guillet at Boston Medical Center in Boston, Massachusetts, U.S., December 16, 2020. Erin Clark/Pool via REUTERS
