There's no way herd immunity is 70%. I believe herd immunity is in the 30-40% range, at its highest, and around 20%. This depends on several things though, like how contagious a bug is. Think about what they are saying with herd immunity being 70%, they believe 7 out of 10 people will have or had the bug. If 7 out of 10 people were visibly sick, recovering or coming down with it, instinctively, you would start to change your habits to avoid them.
That's just insane.
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