As we continue to grapple with the COVID-19 pandemic, most of us are anxious to return to normal life, when we can hug our elderly parents or grandparents and once again gather in large groups. Many experts say that can't happen safely until a coronavirus vaccine is developed. In this unprecedented time, researchers around the world are working toward that goal, but it has to be done safely and follow a careful scientific process. Dr. Natasha Crowcroft, a vaccine expert at the the Dalla Lana School of Public Health at the University of Toronto, joins host Dr. Brian Goldman to help explain how close we are to an effective vaccine against COVID-19, the barriers we must overcome to get there, and what we need to do in the meantime.