Richard Harris

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South Korea's Center for Disease Control has reassuring news about people with COVID-19 who test positive for the coronavirus weeks after their symptoms have resolved.

Health officials there studied 285 patients who tested negative for the virus after recovering, but weeks later tested positive again. The question — in this and similar situations — is whether a positive test in this circumstance means that these people can still spread the virus.

Last month the White House issued guidelines suggesting a way to reduce the number of false positive results in antibody tests: Run two tests. But that strategy has not yet been validated for coronavirus testing. And the details matter.

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