Read full article on NPR.

SEOUL—More than 160 South Koreans have tested positive a second time for the coronavirus, a development that suggests the disease may have a longer shelf life than expected.

NPR news site reports that a growing number of recovered COVID-19 patients are relapsing in South Korea, raising new questions and concerns among scientists and health authorities after the country successfully flattened the curve.

Doctors believe that the disease may have gone dormant and then come back, posing more challenges for testing.

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