Corbett, who helped develop the Moderna COVID-19 vaccine, answers questions related to how long the vaccine is expected to last and other developing news. LEARN MORE: More states giving pregnant women access to COVID-19 vaccines: What to know: https://gma.abc/3rLoM82 Subscribe to GMA's YouTube page: https://bit.ly/2Zq0dU5 Visit GMA's homepage: https://www.goodmorningamerica.com #COVID19 #COVIDVaccine #Morderna #GMA