2 Green Flags for Moderna in 2021 and 1 Yellow Flag

Moderna (NASDAQ: MRNA) recently reported its first-ever product revenue thanks to coronavirus vaccine sales. In this Motley Fool Live video recorded on Feb. 26, 2021, healthcare and cannabis bureau chief Corinne Cardina and Fool.com contributor Adria Cimino discuss two encouraging points from the company's fourth-quarter earnings report -- and one reason for caution. Corinne Cardina: What are two green flags for investors and one potential red or yellow flag to pay attention to?