SEOUL - South Korean health authorities raised new concerns about the novel coronavirus after reporting last month that dozens of patients who had recovered from the illness later tested positive again.
South Korea had reported more than 350 such cases as of Wednesday , according to the Korea Centres for Disease Control and Prevention . South Korea uses reverse transcription polymerase chain reaction tests, which detect the coronavirus' genetic material. "The RT-PCR machine itself cannot distinguish an infectious viral particle versus a non-infectious virus particle, as the test simply detects any viral component," Dr Seol said.
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, Dr Jeong said.
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