Coronavirus: White House discussing certificates of immunity to get people back to work

But wait, wasn't it discovered in South Korea that more than 100 people who already went through COVID disease got tested positive again?

No one is yet sure if virus in their body simply got reactivated, or was it contracted again from some other external source.

Testing people for antibodies sounds like a good idea. And I'm guessing it could also help in speeding up the vaccine development process by understanding how their body react to shut out the virus when it tries to make contact.

So you need a certificate to show you're immune from a hoax?