Dr. Joseph Ladapo says the hepatitis B vaccine's two approved versions were cleared by the FDA on less than a week of safety data. "That is literally a fact," he says. Del recalls @FLSurgeonGen telling him years ago he hadn't yet looked deeply into childhood vaccines, focused instead on the COVID vaccine while working under Ron DeSantis. Ladapo says his understanding has shifted since, crediting @AaronSiriSG's book "Vaccines: Amen" for laying out the data behind how widely used vaccines moved from development to approval. He calls the amount of safety evidence at the time of approval "horrific," describing it as "a very rotten scientific landscape."