Can you get reinfected by coronavirus?

For now, the most likely explanation of why people are retesting positive seems to be that the test is picking up remnants of the virus.

The KCDC has re-investigated three cases from the same family where patients tested positive after recovering, Kwon says.

In each of these cases, scientists tried to incubate the virus but weren’t able to — that told them there was no live virus present.

Like many countries, South Korea uses a reverse transcription polymerase chain reaction (RT-PCR) to test for the virus. The RT-PCR test works by finding evidence of a virus’s genetic information — or RNA — in a sample taken from the patient.