For those who have already been infected withย COVID-19, the idea of having an immunity certificate to allow a return to normal life sounds like an attractive prospect.
But it has revealed that despite keeping coronavirus deaths down to only 214, some people who have recovered from COVID-19 are testing positive again.
The discovery in South Korea has also prompted questions of whether some people have been reinfected with the virus, or if the virus has remained in their bodies and somehow reactivated itself.