Tony Potts, a 69-year-old retiree living in Ormond Beach, receives his first injection as a participant in a Phase 3 COVID-19 vaccine clinical trial sponsored by Moderna at Accel Research Sites on August 4, 2020 in DeLand, Florida, US. Potts is one of 30,000 participants nationwide to be recruited for the Moderna trial who will receive two injections about a month apart and be monitored for two years. (Photo by Paul Hennessy/NurPhoto via Getty Images)