At least 51 patients diagnosed as having fully recovered from the coronavirus in South Korea have tested positive a second time after leaving quarantine, according to officials.

The patients from Daegu all tested positive in a “relatively short time” after they were given the all-clear from their initial infections, the Korea Centers for Disease Control and Prevention (KCDC) said, according to the government-funded Yonhap News Agency.

A specialist team has been sent to conduct an epidemiological investigation in the city, which is the epicenter of the epidemic in South Korea, the agency says.

For now, the KCDC’s director-general, Jeong Eun-kyeong, believes it is likely the infection was re-activated after remaining dormant in the patients, as opposed to them being reinfected, the report said.

Read more at NY POST.