Who has changed the description of herd immunity at Coronavirus info site. Now it implies that only way to achieve herd immunity is with vaccination.
This sums it up pretty well:
“Herd immunity is achieved by protecting people from a virus, not by exposing them to it”
“‘Herd immunity’ exists when a high percentage of the population is vaccinated”
Link to new version: www.who.int/news-room/q-a-detail/coronavirus-disease-covid-19-serology