as of 4 april 2020, antibody tests (which may detect active infections and whether a person had been infected in the past) were in development, but not yet widely used.
Last Update: 2020-08-25
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apart from the super-spreaders, it was estimated that each case could give rise to approximately two secondary cases, with an incubation period of 4 to 7 days and the peak of viral load appearing on the 10th day of illness.