If you have had this novel corona virus once, can you get it again?

Uncertain: Theoretically, it was assumed by many that you would not get re-infected with the same virus once you had already recovered from a COVID 19 infection. However, that assumption has been called into question since individuals in Korea who had recovered and tested negative for virus, later tested positive. Testing was by PCR (polymerase chain reaction) testing. So, we don't know.