As more and more South Koreans were released from treatment for COVID-19, authorities discovered a disturbing trend. Some ostensibly cured patients were later testing positive again.
But in some cases, the tests may detect old particles of the virus, which may no longer pose a significant threat to the patient or others, said Seol Dai-wu, an expert in vaccine development at Seoul's Chung-Ang University. The patients were retested after they either exhibited new respiratory symptoms, or were selected for retesting by authorities.
The KCDC has not found a single case where such patients had passed the coronavirus to another person, Jeong said.
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