By age group, 38 relapse cases were reported among those in their 20s, followed by people in their 50s with 32 cases.The KCDC said it took 13.5 days on average for people to be retested positive for COVID-19 after being released from quarantine.

Of the 137 cases that have clinical and epidemiological information, 61 showed symptoms again, the KCDC said.

No secondary infections have been reported from relapse cases, according to the KCDC. Of the 294 people who had contact with those who retested positive for the new coronavirus, the KCDC said it is currently monitoring 256.

Health authorities said they are conducting virus culture tests on 22 samples that it collected from people who retested positive.

Earlier this week, the KCDC released guidelines on handling relapse cases, which recommend cured patients to self-quarantine for 14 days after being discharged from hospitals. Municipal health authorities are also asked to monitor cured patients.