With a shortage of COVID-19 vaccines, is it a good idea to give people just one dose now and a second dose later when there is more available? How can the process of rolling out vaccines be sped up? What do we know about potential side effects? Which vaccine should I get? Immunologist Dr. Gigi Gronvall from the Center for Health Security talks with Stephanie Desmon to answer these questions and more about COVID-19 vaccines.