As the coronavirus continues to spread, scientists say that part of the challenge of limiting the pandemic is the fact that a vast majority of infected people don’t know they have the virus. According to a new study in the journal Science, there appears to be a high rate of undocumented infections – or “stealth” cases – that are driving the rapid spread of the disease.
Researchers looked at infections in Wuhan, China, where the virus is thought to have begun, before the travel ban was implemented. They note that six out of seven people during that time were unaware that they were infected, either because they had no symptoms or mild symptoms.
While undocumented infections appear to be less contagious than those with worse symptoms, it’s the undocumented cases that are responsible for a vast majority – 79 percent – of subsequent infections.
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