What if immunity to covid-19 doesn’t last?

Researchers say people can catch mild, cold-causing coronaviruses twice in the same year.

https://www.technologyreview.com/2020/04/27/1000569/how-long-are-people-immune-to-covid-19/?truid=e6a9a97f971519b8818ba7420a6d576d&utm_source=the_download&utm_medium=email&utm_campaign=the_download.unpaid.engagement&utm_content=04-28-2020