Herd immunity would be where the general population is immune enough to make those who are not immune inconsequential to the overall health of the wider population. So when we finally get a vaccine, or enough people get COVID and survive, and a significant majority of the population has antibodies, we would no longer have to worry about the part of the population that doesn’t have immunity and could be carriers.
Think about say measles, not everybody can get (or will get) a measles vaccination. But enough of us have gotten vaccinated that we don’t normally worry about the unvaccinated.
I’m thinking that it will be at least six months after a vaccine is available before we have a herd immunity.
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