AI>  AT> "The polio vaccine is 90% effective at preventing polio."
 AI> 
 AI> That is true after two doses. Three doses are 99 to 100% effective.
 AI> 
 AI>  AT> "The covid vaccine doesn't prevent covid."
 AI> 
 AI> No vaccine prevents disease or virus from infecting someone. It helps
 AI> your body fight off infection.

You're contradicting yourself. Why?

--- Mystic BBS v1.12 A49 2023/04/30 (Windows/64)