Says this BBC story.
[T]here is some emerging evidence that there are more "silent carriers", or healthy people with the virus who show little or no symptoms, than experts initially thought.
In China, it is estimated that a third of all positive cases show no symptoms, according to classified Chinese government data seen by the South China Morning Post.
On the Diamond Princess, the cruise ship that docked in Yokohama, about half of the more than 600 positive cases found onboard were found to have no symptoms.
A similar proportion of asymptomatic cases has been reported in Iceland, which says it is testing a higher proportion of citizens than anywhere else in the world.
The prevailing belief has been that because these people do not exhibit symptoms, they are not very contagious. But some are questioning this now.
Maybe if everyone wore a mask those silent carriers wouldn't turn into spreaders?
A recently published study of cases in China found that "undocumented cases of infection", or those with either mild or no symptoms, were significantly contagious and could have been responsible for nearly 80% of positive virus cases.
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