This Herd immunity seems to have been pretty much made up on the hoof, someone mentioned it briefly the other day and they have run with it so as to look like they have a plan.
Is there any evidence so far that immunity has any longevity?
We're certainly not immune to influenza even after having it numerous times through ones life.
Isn't that because it'll always be different strains of influenza?
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This Herd immunity seems to have been pretty much made up on the hoof, someone mentioned it briefly the other day and they have run with it so as to look like they have a plan.