Four medical professionals with COVID-19 who met the criteria for hospital release or lifting of quarantine in China had positive real-time reverse transcriptase-polymerase chain reaction (RT-PCR) results 5 to 13 days later, according to a research letter published yesterday in JAMA.

The researchers said the results suggest that current criteria for hospital release or lifting of quarantine and continued treatment should be reevaluated. “These findings suggest that at least a proportion of recovered patients may still be virus carriers,” they wrote.

Other new research involving the novel coronavirus includes two large clinical studies highlighting the extent of severe cases and common comorbidities, and a UK report notes that its first two COVID-19 cases would not have gotten tested using case definitions.

Credit: CDC

Serial positive RT-PCR results

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