LOUISVILLE, Ky. (WDRB) -- Monday was a big day in Kentuckiana. A day after Pfizer's COVID-19 vaccine arrived in Louisville, it was administered on both sides of the river. The arrival of the vaccine has led to a lot of questions, so WDRB News sat down with Dr. Joseph Flynn, chief administrative officer for Norton Medical Group and physician-in-chief of Norton Cancer Institute at Norton Healthcare, to get some answers. "It's one of the most exciting moments we could have ever hoped for," Flynn said. "When you think back to March, when we were first hearing the term COVID-19, to now, it has been a long, drawn-out process. People have done really miraculous things."