Some folks seeing this story via Twitter noted that there are a lot of other things you can do at home to lower risk if someone brings Covid in. So fyi here are two pieces I wrote about that:

https://elemental.medium.com/air-purifiers-air-filters-and-the-best-diy-hacks-to-reduce-the-coronavirus-risk-14169e8839c5

https://elemental.medium.com/why-some-experts-say-humidifiers-could-help-against-covid-19-59e46885bd06