• The fast-spreading delta variant has exposed weaknesses in vaccine protection and changed the outlook for ending the pandemic.
  • Delta is “just so good at infecting people and replicating that it raises the bar on how good vaccines have to be,” Moderna President Stephen Hoge said in a phone interview.
  • Moderna on Wednesday released new data on Covid breakthrough cases it says supports the need for booster shots.

https://www.cnbc.com/2021/09/16/moderna-covid-delta-variant-is-so-contagious-it-raises-bar-for-vaccines.html