Dr. John Brownstein, chief innovation officer at Boston Children's Hospital, discusses the rising concern about the delta variant. SUBSCRIBE to GMA's YouTube page: https://bit.ly/2Zq0dU5 VISIT GMA's homepage: https://www.goodmorningamerica.com SIGN UP to get the daily GMA Wake-Up Newsletter: https://gma.abc/2Vzcd5j FOLLOW GMA: TikTok: / gma Facebook: / goodmorningamerica Twitter: / gma Instagram: / goodmorningamerica #GMA #CDC #COVID-19 #DeltaVariant #MoreContagious #NewData