Do These Words From Moderna's President Mean Trouble for Vaccine Makers?

Do These Words From Moderna's President Mean Trouble for Vaccine Makers?

Source: 
Motley Fool
snippet: 
  • The delta variant is putting coronavirus vaccines to a tough test.
  • Moderna and Pfizer are already preparing booster and updated vaccine candidates to handle the coronavirus of the future.
  • Moderna's and Pfizer's vaccines will generate $20 billion and more than $33 billion, respectively, this year.