> It's hard to imagine what that process could be if not immunity. The first paragraph of the article amiga_500 linked says: "People who have recovered from Co

> It's hard to imagine what that process could be if not immunity. The first paragraph of the article amiga_500 linked says: "People who have recovered from Covid-19 may lose their immunity to the disease within months, according to research suggesting the virus could reinfect people year after year, like common colds." I don't think there is significant doubt that immunity exists; the question is how long it remains in effect. The drop in deaths that you mention would be compatible with a several month long effective immunity period, but a herd immunity approach would probably not work well if reinfection is possible every year.