Herd immunity is commonly considered when 80% of the population has been infected. Some say 50% . Yet the usa is nowhere near even 50%
Wrong. Antibody only herd immunity uses high numbers. If there is T cell immunity simultaneously present (which we have), then the antibody herd immunity number plummets - most say 20% applies here.
You have a very March/April opinion on this - we are more sophisticated now.