Among the main possibilities are re-infection, a relapse, or inconsistent tests, experts say. Although re-infection would be the most concerning scenario because of its implications for developing immunity in a population, both the KCDC and many experts say this is unlikely. Instead, the KCDC says
SEOUL - South Korean health officials are investigating several possible explanations for a small but growing number of recovered coronavirus patients who later test positive for the virus again.South Korea had reported 141 such cases as of Thursday, according to the Korea Centers for Disease Control and Prevention .Although re-infection would be the most concerning scenario because of its implications for developing immunity in a population, both the KCDC and many experts say this is unlikely.
Kim Jeong-ki, a virologist at the Korea University College of Pharmacy, compared a relapse after treatment to a spring that snaps back after being pressed down. Even if the patients are found to have relapsed rather than to have been re-infected, it could signal new challenges for containing the spread of the virus.
While the RT-PCR tests used in South Korea are considered generally accurate, experts said that there are ways they could return false or inconsistent results for a small number of cases.
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