Nurse shows the Jansenn vaccine vial in front of the fridge in the ‘La Vela’ vaccine hub of the Tor Vergata General Hospital where Johnson & Johnson’s Janssen single-dose vaccine is used, on April 24, 2021 in Rome, Italy. The Covid Vaccine Centre -19 is organised by Regione Lazio, Policlinico Tor Vergata and Croce Rossa Italiana. (Photo by Simona Granati – Corbis/Corbis via Getty Images)