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80% of COVID-19 Contact Cases Caused by 8.9% of Infected Individuals

A study done in the Chinese city of Schenzhen used testing and contact tracing to determine incubation times for COVID-19, infection rates and other statistics. “Index” cases, or the first infected persons identified, were identified and followed to see how many of their contacts also fell ill, and when. Researchers found the average incubation period was 4.8 days, and that just 8.9% of index cases caused 80% of infections among their contacts. They also found that persons...

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