A nurse reaches for a vial of Pfizer-BioNTech Covid-19 vaccine at a pop up vaccine clinic in the Arleta neighborhood of Los Angeles, California, August 23, 2021. – The US Food and Drug Administration on August 23, fully approved the Pfizer-BioNTech Covid shot, triggering a new wave of vaccine mandates as the Delta variant batters the country. Around 52 percent of the American population is fully vaccinated, but health authorities have hit a wall of vaccine hesitant people, impeding the national campaign. (Photo by Robyn Beck / AFP) (Photo by ROBYN BECK/AFP via Getty Images)