South Korean patients thought cured test positive again
South Korean health authorities say 91 people thought recovered after contracting coronavirus have tested positive for the disease again.

The Korea Centers for Disease Control and Prevention (KCDC) said on Friday it was not clear why the patients had tested positive for a second time.

KCDC director Jeong Eun-kyeong told a news conference it was possible that the virus had “reactivated” in the patients, as opposed to them being re-infected.

Other health experts suggested the patients may have "relapsed” or been misdiagnosed by faulty tests.

The results will be of keen interest internationally, as health experts worldwide hope people infected by Covid-19 will develop immunity to the disease, allowing them to return to work.

So, people who walk around thinking "I am invincible and immune" need to follow this story. Immunity or otherwise has not yet been proven. Suffice to say that, if reinfection, or reactivations are possible then, depending on rates of reinfection and relapsing, we could be in for a long haul.