Officials suspect the number of people who have recovered is higher than has been reported, as people with mild cases or those who were asymptomatic weren't ever tested. It's also possible recovered cases are "substantially lower" than the actual number because the Johns Hopkins' tracker pulls information for outside of China from estimates based on local media reports and available state and local reporting.
The Centers for Disease Control and Prevention (CDC) is declaring people recovered based on one of two strategies: symptom-based and test-based. Under the symptom-based strategy, recovery is defined as a "resolution of fever without the use of fever-reducing medications and improvement in respiratory symptoms." If using the test-based strategy, the person should have negative results from tests conducted on at least two consecutive respiratory specimens within 24 hours.
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