Coronavirus: 91 recovered patients test positive again

“We are isolating viral cells from respiratory organs of those who have tested positive for COVID-19 again,” Jeong told reporters.

The KCDC said it was also looking into whether those who retested positive had an antibody that would indicate whether they had recovered, as some health experts said immune people with the antibody were not contagious.

Health authorities in Seoul said that the virus was highly likely to have been reactivated, instead of the people being reinfected, as they tested positive again in a relatively short time after being released from quarantine.