What is herd immunity and can it stop the coronavirus?

Once enough people get Covid-19, it will stop spreading on its own. But the costs will be devastating.

https://www.technologyreview.com/s/615375/what-is-herd-immunity-and-can-it-stop-the-coronavirus/?truid=e6a9a97f971519b8818ba7420a6d576d&utm_source=the_download&utm_medium=email&utm_campaign=the_download.unpaid.engagement&utm_content=03-18-2020