Right. Unless you can get this twice in a short period, someone who tests negative for the virus and positive for the antibodies on an ELIZA-type test has had the disease and is over it, even if they never knew they had it. Once testing for that is going, those people get a green card with a QR code and can move around freely. China is doing that.[1]

[1] https://news.cgtn.com/news/2020-02-20/China-leverages-techno...