The herd gets substantial benefits long before you get to 70% or whatever rate for full herd immunity. The spread starts to slow before that point. If you're

The herd gets substantial benefits long before you get to 70% or whatever rate for full herd immunity. The spread starts to slow before that point. If you're walking around infected and 20% of the people you come in contact with cannot catch it from you, 20% less people are going to catch it, no matter how much you cough on them.