WATCH: UK approves Pfizer corona vaccine
The first patient enrolled in Pfizer's COVID-19 coronavirus vaccine clinical trial at the University of Maryland School of Medicine, May 4, 2020. (AP/Courtesy of University of Maryland School of Medicine)
The first patient enrolled in Pfizer's COVID-19 coronavirus vaccine clinical trial at the University of Maryland School of Medicine, May 4, 2020. (AP/Courtesy of University of Maryland School of Medicine)