A firefighter administers the Pfizer-BioNTech COVID-19 vaccine at a vaccination center near Paris on Monday. The European Union has signed a deal to buy as many as 1.8 billion doses.

A firefighter administers a dose of the Pfizer/BioNTech vaccine to a woman at the Covid-19 vaccination center Paris La Defense Arena in Nanterre, west of Paris on the opening day on May 3, 2021. (Photo by BERTRAND GUAY / AFP) (Photo by BERTRAND GUAY/AFP via Getty Images)