Korea Centers for Disease Control and Prevention (KCDC) on Monday said a total of 51 persons from Daegu and the surrounding North Gyeongsang Province tested positive for COVID-19 a “relatively short time” after they were released.

The virus likely was reactivated, said KCDC Director-General Jeong Eun-kyeong, instead of the people being reinfected once they left, South Korea’s Yonhap news agency reported.

The group of people came from the epicenter of South Korea’s coronavirus outbreak in Daegu.

Health authorities told Yonhap news agency that a team of investigators has been sent to Daegu to conduct an epidemiological investigation into the cases.

In March, the South China Morning Post reported that doctors in Wuhan, China – where the virus emerged – said that as many as 10 percent of coronavirus patients had tested positive again after being discharged from the hospital.

Wang Wei, the president of Tongji Hospital where the first COVID-19 case was identified, told state broadcaster CCTV that those who tested positive did not have any symptoms and none of their close contacts had been infected.

While surveillance of similar patients showed that 80 to 90 percent had no trace of the virus in their system one month after being discharged from the hospital, Wang said officials were only working with “small samples.”

Medical staff members arrive for a duty shift at Dongsan Medical Center in Daegu, South Korea, March 30. (Park Dong-ju/Yonhap via AP)

Following this latest development, officials are now considering using electronic wristbands to monitor the growing number of people placed under self-quarantine to slow the spread of COVID-19 as 47 new cases were reported.

South Korea has been enforcing 14-day quarantines on all passengers arriving from overseas to stem a rise in imported infections.

More than 46,500 people were under self-quarantine as of Monday evening, including 38,400 who recently arrived from abroad, according to Lee Byeong-cheol, an official from the Ministry of the Interior and Safety. That number could grow to 80,000 or 90,000.

Health Ministry official Yoon Tae-ho on Tuesday acknowledged that wristbands would come with privacy concerns. It wasn’t clear how South Korea would enforce the wristbands, but the country has previously warned of a crackdown on those who disobey quarantines.

Yoon said such devices were among several measures discussed as “practical and effective ways” to monitor people isolated at homes and facilities.

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