3 ms·

I don't believe there is any named virus where we have reached herd immunity without a vaccine. Herd immunity was defined by the theory that it would prevent t

I don't believe there is any named virus where we have reached herd immunity without a vaccine. Herd immunity was defined by the theory that it would prevent the spread of measles. It only did so with any measurable effect after universal vaccination was introduced.

standardUser 6y ago
Zika is presumed to have receded due to natural herd immunity.
- statstutor 6y ago
  That's possible but isn't mentioned on its wikipedia article - mosquito control seems at least as relevant.