What the Korea Centers for Disease Control is essentially saying is that the coronavirus detection kit was faulty and that is why it is showing reinfections:

Some coronavirus patients in Korea who tested positive for Covid-19 after recovery — sparking alarm about possible reinfections — probably did so because the country’s sensitive testing procedure detected “dead” virus fragments within their bodies.
A clinical committee for new infectious diseases within the state-backed National Medical Center said Wednesday in a press briefing that there was a low chance that those people were actually reinfected with Covid-19 and said the country’s RT-PCR testing method seemed to have confused a dead virus fragment with an active one.
Fears of reinfection arose after the Korea Centers for Disease Control and Prevention reported cases of recovered patients testing positive for Covid-19 again. By Monday, there were at least 277 people who fell into that category.
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