EU begins effort to vaccinate 450 million

Nurse Elena Betti reacts after receiving the Pfizer-BioNTech COVID-19 vaccine at the Careggi hospital in Floremore

Belgian Lucie Danjou 101 receives a dose of the Pfizer/BioNtech COVID-19 vaccine at Notre Dame home care in Brmore

Staff wait for start of vaccination against the coronavirus at the Treptow Arena vaccination center in Berlinmore

An elderly woman receives the Pfizer-BioNTech coronavirus vaccine at a nursing home in Burgbernheim, Germany, more

Health workers arrive to the Balafia nursing home with the Pfizer-BioNTech coronavirus vaccines, in Lleida, Spmore

A health care worker reacts after receiving the Pfizer-BioNTech COVID-19 vaccine at the Hospital Favoriten in more

Belgian Jos Hermans, 96, receives a dose of the Pfizer/BioNtech COVID-19 vaccine at Woonzorgcentrum Sint-Pietemore

Belgian Josepha Delmotte, 102, receives a dose of the Pfizer/BioNtech COVID-19 vaccine at the La Bonne Maison more

Fridges in which the first doses of the Pfizer/BioNTech COVID-19 vaccine are stored stand in the Swiss Army phmore

Metropolitan Hierotheos of Nafpaktos and Agios Vlasios receives the Pfizer-BioNTech coronavirus vaccine at Evamore

Balafia nursing home worker Sogues Sole, 51, receives an injection with a dose of the Pfizer-BioNTech COVID-19more

Nicanor, 72, receives the first injection in the region of Madrid, with a dose of Pfizer-BioNTech COVID-19 vacmore

An elderly woman receives an injection with a dose of Pfizer-BioNTech COVID-19 vaccine at Vallecas nursing hommore

Intensive care unit nurse Efstathia Kampisiouli receives the Pfizer-BioNTech vaccine at Evangelismos hospital,more

A man receives the Pfizer-BioNTech vaccine at a nursing home in Bad Windsheim, Germany, December 27. REUTERS/Hmore

Healthcare workers applaud Mauricette, a 78-year-old French woman, after she received the first dose of the Pfmore

Members of the ASB (Arbeiter-Samariter-Bund) check the storage at a vaccination center as the country starts imore

French cardiologist Jean-Jacques Monsuez receives a dose of the Pfizer-BioNTech vaccine, at the Rene-Muret hosmore

Staff of Federal Agency for Technical Relief (THW) and relief organization Die Johanniter carry the first thremore

Head of the ASST Cremona vaccination Department, Antonella Laiolo, administers the Pfizer/BioNTech COVID-19 vamore

A staff member at the Swiss Army pharmacy puts a data recorder in a freezer box in which the first doses of thmore

Head of the ASST Cremona vaccination Department, Antonella Laiolo, administers the Pfizer/BioNTech COVID-19 vamore

Medical workers wait to receive the Pfizer-BioNTech coronavirus vaccine at Santa Maria hospital in Lisbon, Pormore