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https://marketbeat.com/articles/the-latest-who-chief-scientist-sees-no-herd-immunity-yet-2020-07-24/The chief scientist at the World Health Organization estimates that about 50% to 60% of the population will need to be immune to the coronavirus for there to be any protective “herd immunity” effect. Herd immunity is usually achieved through vaccination and occurs when most of a population is immune to a disease, blocking its continued spread.
She says that to achieve herd immunity through natural infection, you need to have several waves and you will see the morbidity and mortality that we see now.