How will we know we've reached herd immunity?

Will never happen any more than we ever achieve it for other endemic diseases.

When everyone starts saying Mooh rather than Moooo

Great theater... Herd Non-Variant Immunity not...

Will never happen any more than we ever achieve it for other endemic diseases

That is not what the experts say, I would trust them more than you.

Great theater... Herd Non-Variant Immunity not...

All the variants until now belong to one single serotype and are neutralized by the immunity produced by any of the strains, just with more or less efficacy.

We have been achieving herd immunity from communicable diseases for thousands of years. A particular disease would enter the population, it would devastate the population, and then the survivors would gradually rebuild society.

This time we have the advantage of science. Instead of waiting for enough people to get sick and then die or recover, we can also take advantage of vaccines and medicines. So, when we stop being scared stiff of the current pandemic, we will know that we are on the road to recovery. The question is, how many people need to achieve immunity in order for the pandemic to end? The science is still out on that question, but everyone seems to agree that when enough people get vaccinated, or develop antibodies the old-fashioned way, we will put this awful time in the rearview mirror.